|
 |
On 3/16/2017 12:56 PM, Bald Eagle wrote:
> clipka <ano### [at] anonymous org> wrote:
>
> Excellent information, as always.
> Al ways, always, always learning something new and useful here. :)
>
>> (It should be noted that `srgb <184/255, 115/255, 48/255> * Tone`
>> doesn't give you exactly what you are asking for. Theoretically it
>> should be `(srgb <184/255, 115/255, 48/255>) * Tone`, but that's
>> currently not allowed by the parser.)
>
> So something along the lines of this would be necessary:
> (untested, needs handling of optional transmit and filter values)
>
> #macro RGB2SRGB (C_linear)
> // https://en.wikipedia.org/wiki/SRGB
> // C_linear is a standard rgb color vector
> #local RGB = array[3] {C_linear.red, C_linear.green, C_linear.blue};
> #local SRGB = array[3];
> #local _a = 0.055;
> #local _Threshold = 0.0031308;
> #local _Gamma = 2.4;
> #for (Component, 0, 2)
> #if (RGB[Component] <= _Threshold)
> #local SRGB[Component] = 12.92 * RGB[Component];
> #else
> #local SRGB[Component] = ((1 + _a) * pow (RGB[Component], 1/_Gamma)) - _a;
> #end // end if
> #end // end for Component
> #local C_srgb = <SRGB[0], SRGB[1], SRGB[2]>
>
> C_srgb
>
> #end // end macro RGB2SRGB
>
>
>
Are you trying to come up with a way to interpolate between different
sRGB values? I think clipla said sRGB space is nonlinear.
Mike
Post a reply to this message
|
|
