On 03/26/2017 10:58 AM, Elle Stone wrote:
2- Mode
* Luminance
* Luma
* Lightness
* Average
* Value
3- Advanced options
* Apply filter to the layer's RAW pixels: with an example
If the above means that there should be documentation for the five Modes
and *also* for "Advanced options/Apply filter to the layer's RAW
pixels", I don't think adding documentation for "Advanced options Apply
filter to the layer's RAW pixels" to the desaturate help (or any other
help page for a specific editing option) is a good idea.
Just one example wouldn't do as it would be misleading. Between the
gamma hack and the "color managed" option there are four possible
combinations for the user to choose among, for each desaturate mode:
* The precise effect of each combination of "mode+using or not using the
advanced options" does vary depending on whether the operation in
question requests linearized RGB or RGB encoded using the sRGB TRC. So
for example the effect when choosing Luminance is different from the
effect when using Luma.
*The precise effect also varies depending on whether the image is at
"linear" or "perceptual" precision.
* It seems, though I'm not 100% certain, that the effect also depends on
whether there has been any previous "making of a new profile from a
pre-existing non-GIMP-built-in profile", which in turn depends on
whether the image had an embedded linear gamma ICC profile and whether
the image has been promoted to 32f with linear precision and then
possibly back to gamma precision, and on whether the user has chosen to
automatically promote to 32f in Preferences.
In other words, accurately explaining the possible results from using
the Advanced Color Options in the Desaturate dialog would require a flow
chart in order to explain what happens when using which combination of
the Advanced Color Options given X current precision, Y previous
precision changes and Z original non-sRGB embedded ICC profile, combined
with the choice amongst the various modes for converting to black and
white that the user has made.
I'd very much prefer to not create such a flow chart, especially since
the code for the relevant factors affecting the outcome of any given set
of choices+previous-precision-changes is still in a state of flux.
Best,
L
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