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Crop to specific dimensions?

Jun 22, 2010 11:53 PM

Is there a way to crop to a specific dimension?  I have a 3888x2592 image and would like to crop it to 2400x1600.  Problem I am having is I can get it to 2388x1589 or 2420x1619 or finally after many tries (over a minute of attempting) got it to 2399x1599.  Is there any way to FORCE it to a specific dimension?

 

Also, on export I know you can resize an image, but are you able to apply a resize within lightroom itself?  Can't think of a situation where I would want to do that, but just out of curiousity...

 

 

Thanks,

Clayton

 
Replies
  • Currently Being Moderated
    Jun 23, 2010 12:31 AM   in reply to malathan

    No, you cannot.

     

    Why do you need to crop to exact pixel dimension? Is it a photograph or some technical drawing?

     
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  • Currently Being Moderated
    Jun 23, 2010 12:35 AM   in reply to malathan

    I don't know if you've been doing this, but you can crop to a specific ratio (through Enter Custom...), which in your case would be the very common 3:2 (then set the specific pixel dimensions on output, as, I think, you have been doing).

     

    I don't think you can crop to specific pixel dimensions within Lightroom (save for doing this on export). The current setup is probably a better way to do things anyway, since you can use any region of your original photo at the chosen ratio, rather than having to use a 100% crop.

     

    I've used this method for blog headers, etc., and I've found it very handy to just be able to set the ratio in Lightroom, select the section I want as a header, then export at exactly the dimensions I need.

     
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  • Currently Being Moderated
    Jun 23, 2010 10:40 AM   in reply to malathan

    I almost always just do full resolution.  Rarely do I say to export to a specific size.

    Yet, you ask for precisely 2400x1600. Why not just crop and export without resizing then?

     

    I mean, in my opinion cropping is is more like the artistic part of the photographic process, rather than technical. If you picture happens to "work" better at 2500 or 2300 pixel, rather than 2400, would you still insist on cropping to 2400?

     
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  • Currently Being Moderated
    Jun 23, 2010 11:30 AM   in reply to malathan

    If you have specific pixel dimensions that you use often for specific ratios ... just make an export preset ... no remembering involved except for recalling the preset itself ...

     

    I use many print size and even event specific or client specific presets daily ... really streamlines the workflow ....

     
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  • Currently Being Moderated
    Jun 23, 2010 12:03 PM   in reply to Butch_M

    Butch_M wrote:

     

    If you have specific pixel dimensions that you use often for specific ratios ... just make an export preset ... no remembering involved except for recalling the preset itself ...

     

    I use many print size and even event specific or client specific presets daily ... really streamlines the workflow ....

     

    This is exactly what I've been doing for things like the blog headers mentioned above. I've got a custom crop ratio (these get stored for future use) that's set for the header ratio, then I just use my "Export (for blog header)" Export Present which sets the exact pixel dimensions.

     

    This may not be quite what the OP is after, but I think it's a pretty good way to get his desired results (with, say, an "Export for Desktop Background" preset).

     
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  • Currently Being Moderated
    Jun 23, 2010 8:59 PM   in reply to malathan

    I've complained about this before too, and requested it be added as a feature. You can, however, enter exact aspect ratios, even if your pixel dimensions are greater than 999.999 (the max for LR). You can just enter it as a rational number, so 1900 x 1200 would be 1.900 x 1.200. These numbers provide the same ratio and will work in LR. Not having a way to specify exact pixel dimensions is just LAME, LAME, LAME and would be trivial to do in LR. WE WANT IT ADOBE!

     
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  • Currently Being Moderated

    I like macrophotography where magnification and details matters.

    I have a photo 4000 x 3000 and I want to crop SPECIFIC region of the photo having EXACT size of my desktop i.e. 1440 x 900.

     

    This would give me maximum magification without losing details.

    It's not possible with LR

     
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  • Currently Being Moderated
    May 2, 2012 7:43 AM   in reply to Andrzej007

    In Lightroom, photo dimensions is part of the export function, not the editing.  You cannot specify a size in the develop module.  You are going to have to modify your workflow.  Crop to the 2:3 aspect ratio, and then export with the long side set to 2400 pixels.  That's the way it works.  Otherwise, you would have to have a separate image for every purpose.  The whole idea (for me, at least) is to have one master image that I can use for any purpose.  Then I use the export function to customize the copy for whatever purpose I need.

     
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  • Currently Being Moderated
    May 2, 2012 7:47 AM   in reply to JimHess

    To do what you want will require that you open the image in Photoshop, copy it and then save that image.  Then you will have to name it appropriately so that you can easily identify it by size.

     
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  • Currently Being Moderated
    May 3, 2012 1:04 PM   in reply to JimHess

    Thank you. Easy and simple

    I will crop to specific dimensions in an external tool.

     

    BTW. I don't understand idea behind decision to control photo dimensions ONLY in export while photo aspect ratio in editing.

    It forces me to change my workflow, as you proposed, but the change is very simple.

    Thanks again.

     
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    May 3, 2012 1:19 PM   in reply to Andrzej007

    Andrzej007 wrote:

     

    BTW. I don't understand idea behind decision to control photo dimensions ONLY in export while photo aspect ratio in editing.

    Deciding on dimension in develop module-crop step means that you preserve as many pixels as you can have, for your artistic crop choice.

    This cannot be specified just technically, because you need to decide which part of an image to leave and which to include into the final crop.

     

    Exact dimensions on export means that the image will be recalculated according to your spec (cropped or not - does not matter).

     

    For me this makes perfect sense: human artistic decision while keeping maximum of data in Develop module, adaptation to pure technical spec in export.

     

    Cornelia

     
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  • Currently Being Moderated
    May 3, 2012 4:50 PM   in reply to malathan

    Dunno if it's worth the trouble to you, but you can set the crop in xmp using exif-tool (or a grep util, or text editor), then re-read metadata in Lightroom.

     

    There may be a plugin that automates it.

     

    PS - To "resize" in Lightroom, export back to catalog. I've done this before for special-purpose images.

     

    Cheers,

    Rob

     
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    May 3, 2012 8:22 PM   in reply to Rob Cole

    This is an interesting topic as I become more familar with LR I have been considering using the print module rather than printing from PS. This in part by comments from some of the forum guru's on how much better the print workflow is compared to PS.

     

    About 5 times I year I go into mass printing mode for my shows. I use pre-cut archival matts and buy in bulk to keep the costs down. So in PS I have custom crops that give an image about 0.15" greater than the window opening. This helps me keep the ink costs down as well (all about the margins, $ ones that is).

     

    I have been experimenting with LR and output cropping to keep the workflow within Lightoom, but not being successful. For instance in PS I can crop an image to 4.15"x6.15" to fit an 8x10 matt (I let PS handle the resampling) and print a bunch of copies. Is this possible within LR, because I either I am really missing someting or doing somthing really wrong.

     

    Any ideas more than appreciated

     

    Cheers

     
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  • Currently Being Moderated
    May 4, 2012 12:31 PM   in reply to Cornelia-I

    Cornelia-I wrote:

     

    Andrzej007 wrote:

     

    BTW. I don't understand idea behind decision to control photo dimensions ONLY in export while photo aspect ratio in editing.

    Deciding on dimension in develop module-crop step means that you preserve as many pixels as you can have, for your artistic crop choice.

    This cannot be specified just technically, because you need to decide which part of an image to leave and which to include into the final crop.

     

    Exact dimensions on export means that the image will be recalculated according to your spec (cropped or not - does not matter).

     

    For me this makes perfect sense: human artistic decision while keeping maximum of data in Develop module, adaptation to pure technical spec in export.

     

    Cornelia

     

    OK, but IMHO artistic decision meets technical decision in macrophotography.

     

    Technically ... I don't want any resizing, recalculation, I need 1:1 crop "pixel-in-pixel".

    So...

    1. I start with "crop to 1440 x 900".

    2. Then, I would like to see a rectangle which I can move all over the whole photograph

    3. I would like to choose what to crop (artistic decision) - for example half of an eye of a lizard or head of a spider.

    4. I do crop

    5. I do enjoy the photo on my desktop which feels me with energy for hard work (I like to fight my stress at work by looking on my macrophotos from time to time )

     

     

     

    And the same problem with different point of view...

    You can change size of cropped rectangle using a mouse (for example to crop very small part of whole photo).

    Why I have this functionality using a mouse and I cannot have it with entering certain dimensions? - it only differs with the way I choose size of a rectangle to crop.

    From this point of view it is not artistic nor technical - it is just very simple functionality for choosing area to crop.

     

    Cheers

     
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  • Currently Being Moderated
    Jun 29, 2012 8:42 PM   in reply to Andrzej007

    I agree with Andrzej007.  Sometimes I need a 1:1 crop

     

    First, to those who ask, "Why not do it during export?"  Or worse, "Why would you want to do that?"....   Does it REALLY matter to you WHY I want to do a crop of a specific number of pixels?  The fact is some people really need this.

     

    I do a lot of timelapse stuff and build videos at 1920x1080.  I shoot full frame (in my case that is 4608x3456).  I correct my shots in LR.  So, what's the best way to get my images to 1920x1080?

     

    Here's an example image:

    1.jpg

     

    Well, I could crop with a fixed aspect ratio (which is 16:9) and then export with a resize to 1920x1080, which would give me this:

    2.jpg

    Of course I can crop a smaller portion of the image, and then on export resize down to 1920x1080.

     

    But what about cropping to exactly 1920x1080 at a true 1:1 pixel crop (without resizing down)?

     

    So to crop this image...

    3.jpg

    ... and end up with this....

    4.jpg

    ... I would need to "guess" at the size, release the mouse and check (with informaion overlay turned on).  Then do it again.  And again.  And again.....until I got it exactly at 1920x1080.  That's a royal pain in the rear.

     

    In Photoshop I can use the Marquee tool and define exactly 1920px x 1080px and then go to Image > Crop:

     

    7.jpg

     

    But in LR there is NO way to define actual pixels.  Seems like it would be fairly easy to do, since you can already enter in a custom aspect ratio.  Just add something like a little checkbox in the custom aspect ratio box.  Something like this:

     

    8.jpg

     

    Or make it a set of radio buttons with the ability to choose between aspect ratio and actual pixels.  (And rename the setting to "Custom Dimmensions" instead of "Custom Aspect Ratio".

     

    --------------------

     

    JimHess raised an interesting issue (emphasis added):

    In Lightroom, photo dimensions is part of the export function, not the editing.  You cannot specify a size in the develop module.  You are going to have to modify your workflow.  Crop to the 2:3 aspect ratio, and then export with the long side set to 2400 pixels.  That's the way it works.  Otherwise, you would have to have a separate image for every purpose.  The whole idea (for me, at least) is to have one master image that I can use for any purpose.  Then I use the export function to customize the copy for whatever purpose I need.

     

    Is this true?  Doesn't seem to make any sense to me. Here is some sample crop metadata that LR saves:

     

     

       crs:CropTop="0.232327"

       crs:CropLeft="0.587547"

       crs:CropBottom="0.541667"

       crs:CropRight="1"

       crs:CropAngle="0"

       crs:CropConstrainToWarp="0"

     

    So LR is saving information about 3 corners (don't really need the 4th).  That's it.  So it should absolutely be doable to define a specific number of pixels to crop to instead of an aspect ratio.  The software will still write the same resulting metadata - the location of each of the three corners.

     

    So then, why not just do what other people suggest?  Why crop to whatever portion of the image I want and then resize to 1920x1080 on export?

     

    Well, as Jim said, the whole idea behind LR is to have a single master image that I can use in a whole bunch of ways.  So I can make virtual copies to do other kinds of crops.  But exporting?  That actually means I'm creating "a separate image" for the purpose of doing a timelapse.

     

    See, as it stands right now, I can make all my changes in LR, and then import the RAW files into After Effects, and AE will read the metadata from the file and apply it.  So if I get my crop right in LR (set exactly to 1920x1080) then I can simply import the RAW files and AE will see the footage at the right size.  No need to render before importing, and no scaling needed, which improves the render time.  I don't need to create a whole new set of exported images that eat up storage space.  And I can easily go back in and make an adjustment to my crop in LR, then switch over to AE and reload the sequence.  It'll instantly update, with no need to re-export from LR.

     

    See, THAT's the power of LR.  Exporting is great when you're at the END of your workflow, and for me, LR is just the first step in a long post production workflow.

     

    Edit:  Of course sometimes I don't need 1:1 pixel crops; sometimes I'll want to resize.  In these cases I'll set my crop using a set aspect ratio and then deal with the resizing in After Effects, avoiding the need to render twice (because I still don't need to export from LR to use the RAW files in AE).

     
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  • Currently Being Moderated
    Jun 30, 2012 2:22 AM   in reply to keylightdigital

    keylightdigital wrote:

     

    First, to those who ask, "Why not do it during export?"  Or worse, "Why would you want to do that?"....   Does it REALLY matter to you WHY I want to do a crop of a specific number of pixels?  The fact is some people really need this.

     

    keylightdigital,

     

    You got the defenders all answered to right up front, didn't you?

     

    Workaround for meantime:

     

    Edit one of those xmp files and put the exact crop you want, then read it into a photo (any photo, maybe create a collection of dummy images just to hold crop "presets"), then copy/paste when you need exact crop.

     

    e.g. 1920x1200 =

       crs:CropTop="0"

       crs:CropLeft="0"

       crs:CropBottom="0.4215"

       crs:CropRight="0.4477"

     

    (you can center the crop if you want...)

     

    R

     

    Message was edited by: Rob Cole

     
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  • Currently Being Moderated
    Jun 30, 2012 2:05 AM   in reply to keylightdigital

    You may have noticed that the crop corner coordinates are not in pixels, but are a decimal fraction of the total picture size. You could import a TIFF to LR, crop it to a certain visual composition, externally resample the TIFF to a different pixel count (or substitute another file under the same filename, or point LR at a completely different file) and LR's crop will continue displaying the same percentage width and height of that - not the same number of pixels.

     

    That is how it works for all the tools - also spot healing, gradients etc. It seems to be the philosophy of LR, to deal with your image in pictorial terms, where what you see is more important than what the numbers are.

     

    LR can however export at original dimensions without resampling. So if your output requirement is a specific 1:1 part of your master image, you could do something like the following automated workaround using Photoshop:

     

    In PS, record your desired standard pixel dimensions into a named Action using the Canvas Size command. This command can crop off all pixels that exceed a certain width and height dimension, centred on your starting image. Make a "droplet" which executes this Action, and put it where LR can see it.

     

    http://www.lightroomqueen.com/downloads/bookexcerpts/lr3excerpts/lr3sa mple-32-droplets.pdf

     

    Invoke this droplet when you export from LR (it's a good idea to save this in an export preset). All you need to do before that, is to ensure your LR crop is centred on the part of the image you want  - the pixel dimensions overlay option for Crop will help you to frame something that is a little larger all round than required. Then the PS Action will shrink that crop down in a numerically precise way without any resampling. If you have made the crop too small instead of too big, the Action will instead fill in with some background colour, to still meet the stated dimensions.

     
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    Jun 30, 2012 3:09 AM   in reply to keylightdigital

    keylightdigital wrote:

     

    Does it REALLY matter to you WHY I want to do a crop of a specific number of pixels?  The fact is some people really need this.

    Well yes, of course it matters, if you're expecting something to do a thing it's clearly and unambiguously not designed to do - it'd be like complaining that a little 1 litre city car can't do 200 mph, even though you "really need" it to.

     

    You use the tool that does the job - you don't buy a screwdriver then complain that it's crap at driving nails home.

     
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  • Currently Being Moderated
    Jun 30, 2012 6:59 AM   in reply to Keith_Reeder

    Keith_Reeder wrote:

     

    keylightdigital wrote:

     

    Does it REALLY matter to you WHY I want to do a crop of a specific number of pixels?  The fact is some people really need this.

    Well yes, of course it matters, if you're expecting something to do a thing it's clearly and unambiguously not designed to do - it'd be like complaining that a little 1 litre city car can't do 200 mph, even though you "really need" it to.

     

    My question you quoted is why my desire for a new feature is of any concern to you (or anyone who doesn't want, need, or care about the feature in question).  If you don't need it fine.  But I - and others - do.  If it weren't for people asking questions like, "Why doesn't PS do this?" or "Why can't LR do that?" or even proposing new useful ideas...  a lot of the features that are available in programs today would not be there.

     

    All (well most) of the Adobe CS programs work well with each other.  The fact that we can import  RAW image seqences into After Effects and AE will use the metadata from each individual image (for some file types, not true for jpg's) - metadata that was created by tweaking the images in LR - without first needing to export the images to jpgs or tifs, is INCREDIBLY powerful.  It saves a lot of time and space.  I can't tell you how great it is to tweak a set of images and then NOT have to render them out before I can use the changes.

     

    But what would make LR even better, is being able to define a crop area by absolute pixel dimmensions instead of (actually in addition to) aspect ratios.  It would be a fairly small feature to implement in LR.

     

    Keith_Reeder wrote:

     

     

    You use the tool that does the job - you don't buy a screwdriver then complain that it's crap at driving nails home.

    I suppose everyone could just stay mum about wanting a particular feature.  But then the chances it'll be added by Adobe in a future release are close to zero.  OR people can speak up, give examples of how/why a feature would be useful, and ask Adobe to include it in the future.

     

    I went a step further and even proposed one possible way it could be implemented.  And for the record, this is the FIRST time I've ever asked for any feature to be added to an Adobe product, and went out of my way to provide an example of just one way it would be useful.

     

    Cheers!

     
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  • Currently Being Moderated
    Jun 30, 2012 6:57 AM   in reply to Rob Cole

    Rob Cole wrote:

     

    Workaround for meantime:

     

    Edit one of those xmp files and put the exact crop you want, then read it into a photo (any photo, maybe create a collection of dummy images just to hold crop "presets"), then copy/paste when you need exact crop.

     

    e.g. 1920x1200 =

       crs:CropTop="0"

       crs:CropLeft="0"

       crs:CropBottom="0.4215"

       crs:CropRight="0.4477"

     

     

    Great idea!  I'm going to have to try that out!

     
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  • Currently Being Moderated
    Jun 30, 2012 7:34 AM   in reply to keylightdigital

    Having the ability to be able to crop to specific dimensions in the Develop Module is really an essential feature whether it is cropping for pixels or inches, that is if you want to keep your workflow withing LR.

     

    For example, fine art photograph, and you are applying edge burning to emphasize the main image - or add a vignette for similar reasons. In the develop module you apply your artistic changes, then go to the print module and crop, you are going to mess up or even loose the changes you just made.

     

    The workflow that would be more efficient, in Develop module, make copies/duplicate, crop to the final output size(s), make your changes, exposure adjustments, vignette, then off to the print module to print your specific size print.

     

    Not everyone prints full frame. So the only way to do this is export to Photoshop, apply your crop, save the image, bring it back into LR and carry on - so why bother because everything you need to finish your print you can do in PS. This in my humble opinion, really negates LR being a complete "capture to print" workflow engine.

     

    MK

     
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    Jun 30, 2012 8:26 AM   in reply to MikeKPhoto

    I don't think it was intended for Lightroom to be a "capture to print" program. A lot of people claim to use it as such, and many times that is how I am able to use it. However, Lightroom allows you to specify an external editor. And for those of you who perhaps are more discriminating or sophisticated in your printing needs should expect to turn to that external editor (whatever it is) when necessary.

     
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    Jun 30, 2012 9:19 AM   in reply to JimHess

    Not sure I agree withyou Jim, given the improved output features in LR like Softproofing and the improved print workflow, which many of the forum experts here have touted as being much better than Photoshop - seems to me if Adobe added this feature it would really add the needed final touch. So maybe in the near future Adobe take LR to the next stage for printing, would not go as far as saying sophisticated printing. Given all the tools Adobe has provided in getting a really great image would be a great step foward to be able to take those great images and output them as needed in print.

     

    So I guess this is a feature request

     

    Happy Saturday

     

    MK

     
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    Jun 30, 2012 10:23 AM   in reply to JimHess

    JimHess wrote:

     

    I don't think it was intended for Lightroom to be a "capture to print" program.

     

    Hmmm.....  I think you're sort of right about the capture part.  You use a camera for that, although you CAN actually have your camera tethered while shooting.  But in many ways I think Lightroom is meant to be a "capture to print" program, both literally and figuratively.

    a.jpg

     

    From Adobe: "Adobe® Photoshop® Lightroom® 4 software includes an extensive and powerful array of tools for managing, editing, and showcasing your images. Even better, Lightroom is highly extensible. Its plug-in architecture allows third-party developers to create a huge variety of software plug-ins that let you add new features and capabilities to the already rich Lightroom toolset."

     

    Sure, sometimes you need PS or other programs to do a bit more, but often times (especially with the use of plugins) LR is the only piece of software you need.

     

    Cheers!

     
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    Jun 30, 2012 10:54 AM   in reply to MikeKPhoto
    ...Adobe take LR to the next stage for printing, would not go as far as saying sophisticated printing...

    In my opinion LR is already at the next stage and offers much more sophisticated printing compared to PS.

    The workflow that would be more efficient, in Develop module, make copies/duplicate, crop to the final output size(s), make your changes, exposure adjustments, vignette, then off to the print module to print your specific size print.

    That's exactly what you do in LR today. One of the big advantages of LR is that you don't need do create seperate files for each print size. One original file is enough and can be printed in every immaginable size. And I wouldn't give too much thoughts about that '1:1 pixel-crop-theory'...the uprez algorithms are very good and the resulting prints are as good as it gets.

     
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  • Currently Being Moderated
    Jul 1, 2012 3:45 AM   in reply to malathan

    XmpCrop supports cropping to exact pixel dimensions:

     

    Click here...

     
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    Jul 1, 2012 5:47 PM   in reply to malathan

    Contrary to what everyone is telling you here, yes, you can crop to exact dimensions, kinda. I had the same problem. I first crop to a  specific aspect defined by the dimension I want, for example, 2400x1600. I do this by chosing "Enter Custom" in the crop box at the top right. You enter it as a 2.400 and 1.600, since 2.4x1.6 is the same as 2400x1600, and LR does'nt let you enter big numbers. Then, one you have it cropped to the right aspect, you can export the file to that exact dimension from LR using the Export command. I do this all the time to create exact dimension jpegs for my web site. Works great.

     
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    Jul 1, 2012 5:53 PM   in reply to GrizzlyAK

    Nobody is disputing whether you can export to exact dimensions or not, but if you read a little closer, you'll see the distinction some folks are making, and why they want to crop to exact dimensions, instead of exporting to exact dimensions.

     
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    Jul 1, 2012 6:18 PM   in reply to Rob Cole

    OK so its not possible in LR, is it possible in a pixel editing program like Photoshop, Paint Shop Pro etc. without resampling?

     
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    Jul 1, 2012 6:29 PM   in reply to keylightdigital

    keylightdigital wrote:

     

    Rob Cole wrote:

     

    Workaround for meantime:

     

    Edit one of those xmp files and put the exact crop you want, then read it into a photo (any photo, maybe create a collection of dummy images just to hold crop "presets"), then copy/paste when you need exact crop.

     

    e.g. 1920x1200 =

       crs:CropTop="0"

       crs:CropLeft="0"

       crs:CropBottom="0.4215"

       crs:CropRight="0.4477"

     

     

    Great idea!  I'm going to have to try that out!

     

    Beware, the above mentioned parameters are only correct for 1 of 8 combinations of rotation and flipping (unrotated/unflipped) - it get's complicated quick. But lucky for you XmpCrop will take care of all this for you (once it's finished).

     

    R

     
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    Jul 1, 2012 6:39 PM   in reply to DdeGannes

    DdeGannes wrote:

     

    OK so its not possible in LR, is it possible in a pixel editing program like Photoshop, Paint Shop Pro etc. without resampling?

     

    Yes. - In all programs, whether non-destructive or pixel editor, cropping does not require resampling, only resizing does.

     

    The *only* reason it's not possible in Lightroom, is the resolution when dragging the mouse for crop is too coarse (and crop-size not reflected while dragging), and there is no UI for w/h parameter entry. Lr can handle exact cropping just fine under the hood.

     
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    Jul 1, 2012 7:06 PM   in reply to DdeGannes

    DdeGannes wrote:

     

    OK so its not possible in LR, is it possible in a pixel editing program like Photoshop, Paint Shop Pro etc. without resampling?

     

    Yes, in PS it is.

     
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    Jul 1, 2012 7:28 PM   in reply to Rob Cole

    Rob Cole wrote:

     

    XmpCrop supports cropping to exact pixel dimensions:

     

    Click here...

     

    Cool.  I downloaded and installed, but coming up with an error (which I've submitted via your site).

     
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    Jul 1, 2012 7:38 PM   in reply to keylightdigital

    Thx - I replied...

    R

     
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    Jul 2, 2012 2:25 PM   in reply to Rob Cole

    Yup.  It works!

     
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    Jul 2, 2012 3:49 PM   in reply to keylightdigital

    keylightdigital wrote:

     

    Here is some sample crop metadata that LR saves:

     

       crs:CropTop="0.232327"

       crs:CropLeft="0.587547"

       crs:CropBottom="0.541667"

       crs:CropRight="1"

       crs:CropAngle="0"

       crs:CropConstrainToWarp="0"

     

    So LR is saving information about 3 corners (don't really need the 4th).  That's it.

     

    Not exactly.

     

    Lightroom is saving a fractional amount for 4 edges (as opposed to coordinates for 2 corner points (wouldn't need 3rd or 4th point if this were the case)).

     

    The values that get saved for any given crop, depend on 8 different combinations of flip & rotate - that's why the saved values may seem unintelligible on some (re-oriented) photos.

     

    However, your point (pardon the pun) is well taken: plenty of precision for exact cropping.

     

    Rob

     
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    Jul 2, 2012 6:40 PM   in reply to malathan

    malathan wrote:

     

    Is there a way to crop to a specific dimension?

     

    Answer (in summary) @Lr4.1:

     

    Via direct support in Lightroom UI: No.

    Via manual xmp editing: Yes, if you are willing to figure out the correct values to use, and edit xmp using text editor, read metadata, and then save cropped photos for copy/paste in future.

    Via XmpCrop plugin: Yes, you can crop to a specific dimension, quite simply.

     

    Rob

     
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