[cairo] render in grayscale
hermansson.per at bredband.net
Wed Sep 23 10:26:00 PDT 2009
Soeren Sandmann wrote:
> In cairo master, the HSL_LUMINOSITY operator can be used to get a
> grayscale conversion: compositing the RGB24 on top of opaque white
> using this operator will generate a properly converted grayscale
> image. The attached program will demonstrate this if you set
> "algorithm" to USE_LUMINOSITY.
> If you run it as is, it will just show the color drawing.
Thanks for the help, this seems like the best approach to use when the
next cairo version is released.
Until then a possible solution might to pre-process the pdf before
More information about the cairo