Rather, I synthesize a luminance channel
by combining all my other filtered shots into a monochrome result that can be used as a luminance image.
In order to model the slow-smoke color, luminance channel
is subtracted from chrominance channel and linear interpolation is performed to fit the range of values to [0,255].
The method keeps the image chromatic contrast, which could be lost in case of a simple luminance channel
Gain Channel--serves as the setting of the luminance channel
We suggest this is an unintentional error as the opponent color model is usually considered to comprise a luminance channel
and two chromatic channels, brightness having contributions from all three channels.
With my color data assembled, it's time to address the luminance channel
The luminance channel
of HDR image contains information about dynamic range.
Once I am happy, I then integrate the Luminance channel
with the RGB data using the LRGB Combination tool (Process / Color Spaces / LRGB Combination).
All the parameters of the encoded video signal, such as the black level, blanking level and super-white pulse levels in the luminance channel
, and the differential gain and color burst amplitude of the chrominance channel, are programmable via the encoder's high speed I2C-bus interface.
When merged with the original H[alpha] image, this new RGB channel is now a better match for the high-contrast H[alpha] luminance channel
(set at full opacity).
Features of the luminance channel
processing include peaking filters to improve image sharpness and picture quality.
If we convert a color exposure to Lab mode and then replace the L channel with a Tech Pan exposure, we should end up with exactly the same color information, but the new, finely detailed luminance channel
will result in a superior image.