Re: Colors/Desaturate/Desaturate documentation

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In a tutorial, we use only some features of a dialog.

Gimp-help menus are not tutorials. They are references, and so, each feature of a dialog must be described. Some are common to several commands; they can be grouped in a common-features file.

You can't leave the Advanced option unexplained; you must explain, as you did here, why you can't develop explanations nor give an example. Or what will users think?

In your file, we don't see that Luminance, Luma... belong to Mode.

No, it is not necessary to do more about these Mode options: "Five options are available " is enough

Julien


Le 26/03/2017 à 18:22, Elle Stone a écrit :
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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