I have 2 nearly identical JPG images that have been processed externally, but one file is much larger (in file size) than the other. I have been looking at all the metadata and embedded information but still do not know why they are different.
The only difference I can see is that the larger file has no colour profile embedded, and I believe the original of it was Adobe RGB color space. The first/smaller file is sRGB but I don't see how it could make a 4MB size difference.
EDIT: I also noticed smaller file has 583,372 colours and the larger file has 705,988 colours.