Hi Marti and all,
It seems that floating point (unbounded) conversions to RGB matrix
profiles with true gamma TRCs (other than gamma=1.0), such as ClayRGB
with gamma=2.2 TRC, will clip negative channel values to zero. But
unbounded conversions to profiles with parametric TRCs, such as the sRGB
parametric TRC, does not clip negative channel values.
I understand that pow(value, gamma) is undefined for negative values,
but would code like this make it possible to not clip when converting at
floating point to a profile with a true gamma TRC? Or perhaps the
results wouldn't make any sense?
if (value < 0)
{
value = -1.0 * value;
value = pow (value, gamma);
value = -1.0 * value;
}
Best regards,
Elle
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