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brendan95delany
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In Lightroom 4, is it possible to change the resolution when exporting to Facebook?

Mar 6, 2013 4:23 PM

Tags: #lightroom #resolution #export #change #4 #facebook #ppi #lightroom_4

Is it possible to change the resolution when exporting a photo to Facebook using either the regular plugin or Jeffrey Friedl's plugin?  I can't seem to do it; I only have control over the image dimensions, not the resolution and the dimensions, as you can see in the screen shots below:

Screen Shot 2013-03-06 at 7.01.15 PM.jpg

Screen Shot 2013-03-06 at 7.01.36 PM.png

I have control over both when I export to my hard drive (or a flash drive, etc.), as you can see below:

Screen Shot 2013-03-06 at 7.00.26 PM.png

I can't find the option to control the resolution when I try to export to Facebook.  Before I got Lightroom 4, I would create whole new low-resolution files of images I wanted to post online using Photoshop.  The image size settings I would use are a longest edge of 10 inches at 72ppi, and I would like to continue doing this.  If I can only set the longest side to 720 pixels (I can't even seem to set the longest edge to an inches value - I can only choose a pixels value) and not change the resolution from 300ppi to 72ppi, then my photos' longest edge will only be less than 3 inches long (right?).  Thus, I really want to be able to upload low-resolution photos to Facebook via Lightroom with the ability to change both the resolution and the image dimensions.  Any idea how to do it without having to export to my hard drive first?  Thanks!

 
Replies
  • Currently Being Moderated
    Mar 7, 2013 4:09 AM   in reply to brendan95delany

    Changing the resolution is a meaningless action with regards to digital photos. A complete waste of time, because if you could change the resolution, the image doesn't change by a single pixel. So if your photo is displayed on Facebook at 720 pixels, it is displayed the same regardless of whther the image says 72ppi or 300ppi or any other number. The only time this step might be a valuable step is if you are printing the photo.

     

    That's why there is no option in the upload to facebook dialog.

     
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    Mar 7, 2013 3:36 PM   in reply to brendan95delany

    So Brendan, is DJ Paige right? Is there no value whatsoever in print-resolution when photo is uploaded to facebook? My guess: in general, dj_paige is correct, but if you've found some case for an exception, there is a work-around - do let us know...

     

    R

     
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    Mar 8, 2013 1:21 AM   in reply to brendan95delany

    I'm with dj. Resolution is a print parameter. It's metadata. On screen, only pixel dimensions matter.

     

    If you really want to talk about resolution on screen, it's the monitor resolution that governs it. And that's never 72 btw (that's just an old convenience figure) - but usually somewhere between 90 and 110.

     

    "72 ppi for web" is a long-lived myth, with no basis in reality. On the web you don't need resolution (and so most web-oriented apps just strip it from the file).

     
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    Mar 8, 2013 1:29 AM   in reply to twenty_one

    There are two reasons for using the ppi resolution parameter - the first is, as said above, to print on physical media where you need to control output size.

     

    The second is to stop anyone moaning. Always save it as "300 ppi" in the metadata "Resolution" field so that people who don't understand these things - and there are a lot of them about -  still think they're getting a "hi-res" image when they have a look at the metadata.

     
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    Mar 8, 2013 1:41 AM   in reply to Imagenomad

    1. Are you or anybody else able to print images straight from facebook, such that print resolution would actually have an effect?

    2. Sounds silly to me: I'd be inclined to set it to zero so it obviously doesn't mean anything.

     

    If it really does make a practical difference for printing (see #1 above), then I can add a small tweak to Exportant (and export "filter" plugin) so you can set the resolution to whatever you want.

     

    Let me know if you're serious about this...

     
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    Mar 8, 2013 3:29 AM   in reply to Rob Cole

    Rob Cole wrote:


    I'd be inclined to set it to zero so it obviously doesn't mean anything

    You can set it to whatever you like, and it makes no difference. Most of the time (depending on how you saved it), it will still open as "72".

     

    When you save an image for web, the resolution is usually stripped from the file. It's simply not there anymore. That's probably what happens in the Lr facebook module, and that's why there's no entry for it.

     

    But when you open that image somewhere else, that default of 72 ppi is assigned. Most apps need to know what to do with a file if asked to print it out. So there is a default, and that's usually 72, mostly by convention. With that default ppi, it prints out at a comparable size to what you see on screen at 1:1 display.

     

    And when people see that, they think "hey, web images are 72 ppi". But they're not - that figure is just inserted there by the opening application.

     
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    Mar 8, 2013 4:19 AM   in reply to twenty_one

    Rob

     

    As far as I know, you can't print from Facebook. Furthermore, even if you could, Facebook puts a size limit on photos, so most of the photos on Facebook can't be printed at any meaningful size anyway. Lastly, for example, if you were to upload an 16 megapixel  image to Facebook, the Facebook software compresses/resizes the photo (and a lot of people think it does a relatively poor job of it) so it will fit into Facebook's size limits (which I think is that the largest side is 2048 pixels), and who knows what it does to the ppi field, so again, if you wanted to print from Facebook, you'd be better off printing from your own local software.

     
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    Mar 8, 2013 5:29 AM   in reply to dj_paige

    OK - I concede... (case closed AFAIC).

     
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