improving color stack in xdvipdfmx

Shunsaku Hirata shunsaku.hirata74 at
Wed Jun 10 16:17:17 CEST 2020


Currently I can't spend much time for this but technically having one
more stack for transparency (actually this could be ExtGState stack)
is relatively easy, and also, extending xdvipdfmx to support various
color models is definitely possible.

Shunsaku Hirata

2020年6月8日(月) 20:37 Ulrike Fischer <news3 at>:
> xdvipdfmx has a color stack but it is missing some features compared
> to the color stack(s) in pdf/luatex
> At first there is only one color stack, that makes it difficult to
> add support e.g. for transparency.
> But more importantly one can only put rgb, cmyk and gray values on
> the stack. There seem to be no way to store also a color model. That
> means that while one can define and use tints from a separation
> color space ("spot colors") as shown in the dvipdfmx manual, it is
> not possible to use them for running text going over a page break.
> Would it be possible to improve xdvipdfmx here?
> --
> Ulrike Fischer

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