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BMP images are not compressed at all, so even in black and white, the size will still be large. The one file I downloaded as an example gave these results, and it's a pretty big difference:
Color .bmp, 1743KB
Color .jpg, 229KB (uploaded this one)
B&W .jpg, 211KB
B&W compressed .jpg, 94KB (uploaded this one)
I uploaded just 2 of the test images so you can see the quality is virtually the same, especially when viewed on the reader. I have a PRS-350 with only internal memory, so I'm more conscious about conserving space, but I always try to compress images as much as possible as long as quality isn't sacrificed, especially for anything on the internet where others will be viewing the images.
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