Change in file size when opening JPG in PhotoshopCS

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Posted By
Elizabeth_A_Hindman-Bell
May 18, 2004
Views
269
Replies
2
Status
Closed
I recently upgraded from 7.1 to CS. I have a number of small jpg files (250-350 KB)files which show up as large files (2.5-3.5M) when opened in Photoshop CS. In other words, when I view the file using windows XP file browser they are small files (which they should be) but when I open them with Photoshop CS they are quite large
When I look at the Image/Image Size, in Photoshop CS, for the file the dimentions are quite large. Is there something in Preferences which might make these files resasmple at a larger dimension? I used another editing program to open these files to see what happened and they came in at the correct size.
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dave_milbut
May 18, 2004
jpg compresses files. photoshop needs to decompress them before working on them. that could be what you’re seeing. remember if you re-save a jpg, you’re degrading it because jpg uses a "lossy" compression algorithm to save the files – it literally throws data away. always do all your work in a format like psd that doesn’t discard data, and only save to a jpg as a final step.
MM
Mac_McDougald
May 18, 2004
See Dave’s post.

PS 7 shows them the same, perhaps you just never noticed.

When you open a JPEG, PS reports actual pixel dimension size uncompressed, ala TIFF format, and NOT the actual compressed size on disk.

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