Incorrect file size showing in photoshop

Forum|Forum|2 years ago
April 5, 2023
1 reply
1530 views

Hi,
When previewing file size in photoshop (Image > Image Size), I see a different size from what shows when the JPG is then saved on my machine. Please see example below. Does anyone know why this is happening please?

Photoshop - 3MB

This very images saved on laptop - 596 KB

???

Windows

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davescm

Community Expert

Image size shows file size in RAM so 1276 x 823 x 3 = 315044 = 3.0MB ( There are 1048576 bytes in a MB)

That is different to the saved file size on disk, after lossy jpeg compression which compresses the file to 596KB.

Dave

M

MargoM.Author

Known Participant

Hello Dave,
Thanks for the answer. Sorry if I'm asking silly questions, but what does the 3 in '1276 x 823 x 3' stand for? The 1276 and 823 are height and width in pixels, but I'd need help wrapping my head around that last componenet of the equasion 😄

davescm

Community Expert

The three is three bytes, one for each RGB colour in an 8 bits/channel image. If the document was 16 bits/channel it would be two bytes per colour, so x 6.

Dave

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