[NTG-context] metapost: remapping colors of an SVG picture

[Hans Hagen]

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).
>>>> <to be read again>
>>>> ]
>>>> <*> ... ; 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

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