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HeadshotsPro
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Reduced dpi from 300 to 72 saved in new file results in reduced size but not dpi

Nov 17, 2012 9:46 AM

Tags: #cs6 #reduced_file_size

I use action macro to reduce 8x10s @ 300 dpi to 72 in a subfolder sent to clients by web for them to evaluate and choose preferred images.  However, they get 2x3 images at the original dpi, so what they see on their monitor is too small to see differences.  If uploaded to facebook etc. images look muddy.  What am I doing wrong?  Large files typically exceed Yahoo max. What can I do right?

 
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  • Currently Being Moderated
    Nov 17, 2012 10:13 AM   in reply to HeadshotsPro

    Not sure what you are saying. DPI is meta. It's a concept that maps pixels to physical realworld units and viewing images on which you have reduced the overall pixel count in "dumb" viewers that don't care for DPI flags will display them 1:1 and may in fact dispaly the DPI info wrongly or based on their internal, arbitrary settings. or in otehr words: 100 pixels at 300 DPI are still only 100 pixels at 72DPI, but 1cm at 300 DPI contains 300 pixels while at 72DPI 1cm only contains 72. Reducing the pixel count will of course also reduce detail due to interpolation. Add to that JPEG compression and it's not gonna get better. So more or less, everything is as it should be based on your description. If you want them to be at ful lsize and contain the full details, then don't make them smaller. It's as easy as that.

     

    Mylenium

     
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    Nov 17, 2012 10:31 AM   in reply to HeadshotsPro

    You can check your Action to see if it's doing this:

     

    Image : Image Size

     

    Than just replace the 300 with 72. And leave the image dimensions the same (8" x 10").  Voila.

     

    Change dpi.png

     
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    Nov 19, 2012 7:15 AM   in reply to HeadshotsPro

    The fact that what I suggested before isn't working is odd, and a concern. It works perfectly here, as expected.

     

    Please verify that all the checkboxes shown in my earlier screenshot are checked. I previously suspected that your Action was faulty somehow, but if you are doing this simple thing manually with wonky results, then something else is definitely wrong. But never having experienced this problem before, I am at a loss as to what strange anomaly might be causing it.

     
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    Nov 19, 2012 8:00 AM   in reply to HeadshotsPro

    Is this a Creative Cloud membership, or a regular app download? If not Creative Cloud, then you should be able to uninstall and reinstall. There should be an "uninstall" app there with your faulty Photoshop.

     

    PLEASE check out this thread before you uninstall though!  http://forums.adobe.com/thread/1006208  -- as in, make sure you can re-download your purchase if you don't still have the installer. With both uninstaller and installer, you should be fine. If you are Creative Cloud, the procedure may be different.

     

    http://www.adobe.com/support/connect/connecthostedsupport.html

     

    Good luck.

     

    Added support phone number link.

     
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    Nov 19, 2012 8:34 AM   in reply to HeadshotsPro

    Ellis,

    So, as I understand your problem, you are down-sampling 8x10 images from 300 PPi to 72 PPI (going from 2400 px x 3000 px to 576 px x 720 px). The down-sample part is working correctly, but the metadata (the info in the image file that describes PPI and thus print size) is showing 300 PPI and the smaller print size. Is this correct?

     

    What happens if you down-sample then go File> Save for Web, which will strip the metadata?

    It sounds like you are getting the pixel size you want, just an incorrect PPI. (Don't place so much importance on PPI. Most times it is an insignificant bit of information)

     
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    Nov 19, 2012 8:48 AM   in reply to HeadshotsPro

    HeadshotPro,

     

    You might want to exclude your personal info of email, phone, address as this can open you up to spam.  The moderator will delete when he sees it but an extra step for them.

     
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  • Currently Being Moderated
    Nov 19, 2012 9:05 AM   in reply to HeadshotsPro

    Not to go off topic...

    This gets back to what I've harped about for years: the term "resolution" being used to describe both the total number of pixles in an image AND the PPI of an image creates confusion. They are two very distinct and different things.

     

    I like the term pixel density as a replacement for "resolution" when describing PPI.

    ImageSizeDialog_revised.jpg

     
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    Jul 27, 2013 8:44 AM   in reply to HeadshotsPro

    Am not sure if you've managed to resolve your DPI issue, but i'm using the old photoshop 6 and having the same issues....has anyone come to any defintive solutions or have a solid strategy to get round this?

     
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