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Gabrielle Madsen
Gabrielle Madsen
Known Participant
April 30, 2019
Answered

File Size Discrepency from Photoshop to Lightroom

  • April 30, 2019
  • 2 replies
  • 606 views

Hi Everyone,

Yesterday I discovered that my file sizes were unable to upload from Lightroom as PNG to Adobe Stock.  (I do a lot of digital work for game engine so I just typically save for web in PNG and became a habit).  However, I also discovered that the file sizes were in the kb's rather than at least 4 MP as minimum size for Adobe Stock.  So I have since resized and resaved to JPG.  But the odd thing I discovered this morning is that after saving files as JPG they were still too small despite what appeared to be adequate sizes.  Is there a technical understanding I am missing?  Example Images Attached.

    This topic has been closed for replies.
    Correct answer Per Berntsen

    MP (megapixels) is not file size, but the pixel count of an image.

    So 4 MP means 4 million pixels. An image measuring 2000 by 2000 pixels will be exactly 4 megapixels.

    The image you have at 1200 x 1800 pixels is 2.16 megapixels, and therefore smaller than what is required.

    So you have to resize to pixel dimension that when multipied are over 4 million, like for instance 2000 x 3000.

    2 replies

    Gabrielle Madsen
    Gabrielle MadsenAuthor
    Known Participant
    April 30, 2019

    Thank you thank you!   And yes, of course

    So minimum should be 2000 pixels on either side! 

    Apologies for such a novice question but truly appreciated

    dj_paige
    dj_paige
    Legend
    April 30, 2019

    Well, I don't really think the minimum has to be 2000 pixels on either side.

    2000x2000 is indeed 4MP, but so is 1000x4000 and so is 2667*1500, and many other combinations.

    Gabrielle Madsen
    Gabrielle MadsenAuthor
    Known Participant
    April 30, 2019

    Gotcha, yes that makes sense mathematically as well.  Curiously I was confused by the image size reading 6.18 M (as this is what I believed indicated that the file was indeed over 4 M.

    Per Berntsen
    Community Expert
    Per BerntsenCommunity ExpertCorrect answer
    Community Expert
    April 30, 2019

    MP (megapixels) is not file size, but the pixel count of an image.

    So 4 MP means 4 million pixels. An image measuring 2000 by 2000 pixels will be exactly 4 megapixels.

    The image you have at 1200 x 1800 pixels is 2.16 megapixels, and therefore smaller than what is required.

    So you have to resize to pixel dimension that when multipied are over 4 million, like for instance 2000 x 3000.

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