Re: [NTG-context] metapost: remapping colors of an SVG picture
On 2/20/2020 10:29 AM, Jan U. Hasecke wrote: Am 18.02.20 um 19:24 schrieb Jan U. Hasecke: Am 18.02.20 um 19:17 schrieb mf: Il 18/02/20 19:07, Jan U. Hasecke ha scritto: Am 18.02.20 um 14:53 schrieb Hans Hagen: \setupcolors[rgb=no] \startMPcode draw lmt_svg [ filename = "sample.svg" ] ; \stopMPcode I get this error. ! Not implemented: (unknown numeric)=(string). ] <*> ... ; p := lmt_svg [ filename = "sample.svg" ] That's because it's LMTX only (the "lmt" prefix of "lmt_svg" should stand for "luametatex"). Yes, with lmtx it works but there is no image in the resulting file. Sorry for digging deeper. I am very thrilled by the idea that I could simply adjust a RGB SVG to well defined CMYK colors with this trick. Can anybody confirm if this works? mf and i are playing with an overload mechanism (actually pretty trivial) ... more later but in principle the answer is yes, but - first we have to play around a bit - then it needs to end up in the core - then there need to be a new context upload - and mf has to wikify it so, some patience is needed Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] metapost: remapping colors of an SVG picture
Am 18.02.20 um 19:24 schrieb Jan U. Hasecke: > Am 18.02.20 um 19:17 schrieb mf: >> Il 18/02/20 19:07, Jan U. Hasecke ha scritto: >>> Am 18.02.20 um 14:53 schrieb Hans Hagen: >>> \setupcolors[rgb=no] \startMPcode draw lmt_svg [ filename = "sample.svg" ] ; \stopMPcode >>> I get this error. >>> >>> ! Not implemented: (unknown numeric)=(string). >>> >>> ] >>> <*> ... ; p := lmt_svg [ filename = "sample.svg" ] >>> >> That's because it's LMTX only (the "lmt" prefix of "lmt_svg" should >> stand for "luametatex"). > > Yes, with lmtx it works but there is no image in the resulting file. Sorry for digging deeper. I am very thrilled by the idea that I could simply adjust a RGB SVG to well defined CMYK colors with this trick. Can anybody confirm if this works? juh ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] metapost: remapping colors of an SVG picture
Am 18.02.20 um 19:17 schrieb mf: > Il 18/02/20 19:07, Jan U. Hasecke ha scritto: >> Am 18.02.20 um 14:53 schrieb Hans Hagen: >> >>> \setupcolors[rgb=no] >>> \startMPcode >>> draw lmt_svg [ filename = "sample.svg" ] ; >>> \stopMPcode >> I get this error. >> >> ! Not implemented: (unknown numeric)=(string). >> >> ] >> <*> ... ; p := lmt_svg [ filename = "sample.svg" ] >> > That's because it's LMTX only (the "lmt" prefix of "lmt_svg" should > stand for "luametatex"). Yes, with lmtx it works but there is no image in the resulting file. juh ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] metapost: remapping colors of an SVG picture
Il 18/02/20 19:07, Jan U. Hasecke ha scritto: Am 18.02.20 um 14:53 schrieb Hans Hagen: \setupcolors[rgb=no] \startMPcode draw lmt_svg [ filename = "sample.svg" ] ; \stopMPcode I get this error. ! Not implemented: (unknown numeric)=(string). ] <*> ... ; p := lmt_svg [ filename = "sample.svg" ] That's because it's LMTX only (the "lmt" prefix of "lmt_svg" should stand for "luametatex"). You find documentation about that in LMTX docs, luametafun.pdf, chapter "SVG". Best wishes, Massi ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] metapost: remapping colors of an SVG picture
Am 18.02.20 um 14:53 schrieb Hans Hagen: > > \setupcolors[rgb=no] > \startMPcode > draw lmt_svg [ filename = "sample.svg" ] ; > \stopMPcode I get this error. ! Not implemented: (unknown numeric)=(string). ] <*> ... ; p := lmt_svg [ filename = "sample.svg" ] juh ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] metapost: remapping colors of an SVG picture
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 > 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 ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___ -- - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
[NTG-context] metapost: remapping colors of an SVG picture
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 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> 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 ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
