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So, what I want?
For other people, prevent font size change too much:
may be a minimum scale factor and max scale factor setting for all pages,
or a page zoom factor = max scale factor / minimum scale factor within a output page,
or both.
For me, a lossless option which can avoid pixel resampling:
scale factor always = 1
(x,y) offset always be integer by using pixel as unit.
To check does it lossless or not is easy, using 4 or 5 color images as source, if total output filesize not increase much (compare by total image filesize), and check the biggest output image file to see how many color?
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