I scan an image with imageenview and save it to a jpg file with 90 quality... i get about 1200kb I scan the SAME image with other programs (faststone,irfanview,photoshop cs5) and saved with 90 jpg quality and i get from 300kb to 400kb i all saved in 24bit depth and with the same resolution and dpi. why so much file size difference? also tried with/without "progressive" but the file size change few kb.
i just notice that some program apply an automatic soft correction (contrast or brightness) before saving. to avoid resize or resample differences, i've scanned the whole bed scanner space