Quote:
Originally Posted by MGlitch
Yeah your copy is good, but the one from Amazon themselves does need to be edited. Dunno why Amazon made it set to medium instead of book but they did. Font forge also complained it was set to 1000 em instead of something else, so clearly there’s something hinky with the file they provide it just doesn’t affect the reader in Kindle.
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There is a tradition of setting the em size to 1000 for Adobe Postscript fonts and 2048 for TrueType fonts. TrueType at one time stated that font em sizes that were a power of 2 would rasterize faster. As examples, Bookerly has an em size of 1000 while Charis SIL 6.101 has an em size of 2048. Personally, I haven't noticed any real speed difference between using either of those fonts.