Am 27.08.2017 um 15:31 schrieb Le_Forgeron:

>>> global_settings {
>>>   assumed_gamma 1.0
>>>   ambient_light White
>>> }
> 
> 
>> As those are probably gamma precomputed, using srgb is probably beter :
>> texture { pigment{ srgb <v4, v5, v6>/255 }
>>
> 
> If you intend to do a "2D like" picture with exact match of the colour,
> you should use also "assumed_gamma srgb" in global settings

`assumed_gamma srgb` is never a good idea. If you're using `srgb` for
the pigment and `File_Gamma=srgb` you should be fine in terms of input
colour = output colour. If you're only using `emission` or `ambient`,
the `assumed_gamma` setting should actually be irrelevant.

> and "finish
> { ambient 1 diffuse 0 reflection 0}".

with v3.7 you should better use

    finish { ambient 0 emission 1 diffuse 0 reflection 0}

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