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Terry329237801f4u
Participant
October 14, 2023
Question

Files upsizing upon export from Photoshop

  • October 14, 2023
  • 1 reply
  • 176 views

I've been having problems with downsizing an image size in photoshop (in this case I want photos to be 3mgs. or slightly less) and upon export they upsize. The example: I downsize a raw file (22 mgs) to 3mgs. in Photoshop. When exported the file size in the finder is 5.2. This happened with 3 out of 5 files exported. All images were shot at the same time, with the same settings. I just spent two hours on Zoom with a photoshop expert who couldn't figure it out either. Has anyone else experienced this? Thanks.

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    1 reply

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    October 14, 2023

    File size is the product of several independent factors:

    • pixel dimensions.
    • number of channels. A raw file is a single channel, but an RGB file is three channels, so three times bigger.
    • data compression. Jpeg is extremely compressed, reducing a file to anywhere between 1-5 % of full native size. PNG compression is less effective, but not destructive
    • image content! The jpeg compression algorithm works much more effectively on flat areas than on busy detail, by a factor of up to 10 x.

    In short - the file size indicates precisely nothing.

    T
    Terry329237801f4uAuthor
    Participant
    October 14, 2023

    Thanks, but then what is the best way to try and reduce a raw image down to a 3mg. file size. I'm stumped.

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    October 14, 2023

    Either crank up the jpeg compression - in other words, go down in quality level - or reduce the pixel size.

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