[roger64]

Thanks for your reply.

1. It's my mistake. I should not have quoted Charis Sil. In fact, I thought that the resulting average size of a subsetted ttf font could be estimated, and to be not so different between fonts. Of course to achieve such a result, the original Charis Sil would have to be downsized a lot while another font would be much less downsized. I was speaking about the end result size.

Another thing that you noted is that there is usually quite a discrepancy between Regular (widely used), Italic (used), Bold and Bold-Italic (scarcely used). This should appear in the end results.

So, I will say it in another way: to provide a book with a Regular and Italic ttf subset for 120 characters, we should embed on average : 120k, 240k, 480k?

2. I'll have a look at EPUB Optimizer.

Nota: FYI these two programs apparently on docs.google.com cannot be downloaded from mainland China. Of course, where is a will...