David E. Ross wrote:
I tried to recreate your problem. However, a very sharp JPEG file that is 1852x1852 px is only 750 KB on my PC.
Image file size depends both on the number of pixels and on the color depth. 1852×1852×2/8=857,476 bytes = 837.38 kB (black and white) is much less than 1852×1852×1,048,576/8=449,564,377,088 bytes = 439,027,712 kB = 428,738 MB (true color).
I haven't bothered to account for check bits and the efficiency achieved by the lossy JPEG format, but the principle holds: color depth affects file size.
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