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On 2/18/2020 12:18 PM, mf wrote:
Hello list, I tried this:
\starttext \startMPcode picture p ; p := lmt_svg [ filename = "sample.svg" ] ; draw p ; color black_rgb ; black_rgb := ( 0, 0, 0 ) ; color red_rgb ; red_rgb := ( 1, 0, 0 ) ; remapcolor( black_rgb, red_rgb ) ; recolor p ; draw p shifted ( bbwidth(p) + 5mm, 0) ; \stopMPcode \stoptext
\setupcolors[rgb=no] \startMPcode draw lmt_svg [ filename = "sample.svg" ] ; \stopMPcode
but recolor gives an error: metapost log > >> picture metapost log > ! Wrong picture color model: redpart of grey object. metapost log >
_f_:=(redpart(EXPR0), metapost log > greenpart(EXPR0),bluepart(EXPR0));if.bou... metapost log > metapost log > repathed->...fi;fi;else:addto._p_.also.i;fi;endfor metapost log > ;setbounds._p_.to._b_;_p_.... metapost log > <to be read again> metapost log > ; metapost log > <*> ...apcolor( black_rgb, red_rgb ) ; recolor p ; metapost log > draw grayed p shifted ( b... metapost log > My goal is to remap colors of an SVG image, like this:
\starttext \startMPcode picture p ; p := lmt_svg [ filename = "sample.svg" ] ; draw p ; color black_rgb ; black_rgb := ( 0, 0, 0 ) ; cmykcolor black_cmyk ; black_cmyk := ( 0, 0, 0, 1 ) ; remapcolor( black_rgb, black_cmyk ) ; recolor p ; draw p shifted ( bbwidth(p) + 5mm, 0) ; \stopMPcode \stoptext
It relates to a recent thread in the mailing list about color management. It's an attempt to use inkscape-made SVG graphics inside a CMYK workflow, without using color management.
Naturally it would work under some constraints, but there's a lot of graphics you can do with Inkscape that falls inside these: - the number of colors in the input SVG should be limited, so that every color gets converted - no embedded bitmaps, only vector graphics - perhaps some other constraints on gradients, transparency, etc.
A good alternative would be a remapper based on a custom lua function like this:
function rgb2cmyk( r, g, b ) ... return c, m, y, k end
Massi
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