Quote:
Originally Posted by slayda
Even though the readers only display 4 or 8 or 16 shades of gray, the ebooks (especially) PDF ebooks made for viewing on a computer) may be stored as 24 bit color images rather than 4 bit gray scale images. That will cause them to be 6 times larger (uncompressed). If the ebook images are made as 4 bit gray scale (i.e. made for e-ink readers) then the ebooks with images will be correspondingly smaller.
This is something for the publishers to consider unless you want to pre-process all the images in your ebooks. With most of the books I read, the only images are maps of some sort, and unless I bookmark them for future reference, they are mostly useless. For that reason I often just leave them out when converting the format for my personal reading.
Some printed books used to have a black & white drawing at the beginning of each chapter but it's been a long while since I've seen any like that. Some of the classics that HarryT works on may very well still have that though.
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Well JPG images can only go as low as 256 colors grey scale and all images will look better, do to dithering, if they have more than 4 shades of gray but I agree the 4 bits (16 shades of gray) does a good job at display plus saving space in GIF and PNG files.
Dale