Quote:
Originally Posted by SBT
Thanks, Jellby. Good suggestion.
You mention saving space. One trick I often use for B&W line drawings is to reduce the number of shades of gray. Fifty is ample ;-) That gives quite a saving, and personally I find it difficult to detect any degradation. However, I only know how to do this in ImageMagick; "mogrify -colors 50 image.png", though it must be possible to do the same in Gimp.
I like keeping some kind of "source" images in full size, full colour, and then pass them through an Imagemagick command to shrink them, and possibly use pngcrush as well to save another few bytes, before I use them in the ebook.
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When working with binary it is usually more space efficient to use binary values. For example 2, 4, 8, 16, 32, 64 so 50 would not be as good a choice as 32 or 64 depending on how many shades you want. 50 is likely to take the same space as 64. 16 is all most e Ink readers support so even picking 16 will make it smaller and will likely display faster since less processing will be needed to reduce the image to 16.
Dale