Hi,
I created another new Python plug-in for GIMP3. This plug-in creates a color area mask based on a different principle (relative color) than existing color selection tools. See the following post for more on this idea:
This idea is similar with “Hue-Saturation” module in GIMP, but this mask enable more flexible adjustment and natural results.
You can download this plug-in from the link below.
If you install this script, you can see this script in [Layer] > [Mask] > [Parametric Mask] > [add Relative RGB Color Mask…] and run it.
[Fig. 1]
And you can see the dialog below.
[Fig. 2]
[Select the target color of the Mask] parameter determines the primary or complementary color the created mask is based on. The mask will be created based on the relative primary or complementary color value (for example, relative red value or relative yellow value, and so on) and not on the delta E of specific color nor hue value.
[Threshold of the target color] parameter determines the wideness of the area of the mask. A higher threshold will broaden the mask area, a lower threshold will narrow it.
[Skew of the target color] parameter adjusts the color nuance of the target primary or complementary color.
[Set the effective brightness range of the mask] adjust effective brightness range of the mask.
[Apply uniform value] determines whether the mask intensity (transparency) is 1.0 fixed or variable depending on the relative color value.
[Invert the mask] and [Save the mask image as tiff] parameters are self explanatory.
And here is a mask example created with this plug-in.
Original image (too reddish)
[Fig. 3]
Created mask using this plug-in
[Fig. 4]
Reddishness corrected result using this mask and Hue-Chroma tool
[Fig 5]
The same image corrected only using the Hue-Saturation tool
[Fig 6]
However, we can confirm artifacts on this image.