To open the window, select 
in the window (hotkey: Ctrl + m).
The window lets you perform color correction on paint layers.
Presets
Lets you select, create, or edit a color adjustment preset. See also Create color adjustment presets.
Select any of the following options. Selecting an existing preset loads the preset values in the window.
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Lets you reload any curve adjustment made when you last accessed the window, even if you did not save the changes as a preset. (For example, if you adjusted the curve then clicked to close the window without saving, you can select this option to retrieve that unsaved curve.)
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Resets values in the window back to their original values, letting you experiment with various presets and settings, then easily revert to the
original colors as necessary.
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Inverts the RGB channel curve of the selected paint layer.
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Retains the same curve but sets the option to , replacing all color with grayscale values.
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Converts all pixels to either maximum or minimum values. Any pixel below half-brightness turns black, and all other pixels
turn white.
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, , and presets can all be used to help reduce the effect of lighting information baked into a photograph.
For example, if you're using a photograph of a face as a stencil and rubbing the diffuse texture onto a mesh head, you can
apply these presets to remove as much of the shadows and specular highlights in the photograph as possible, so as not to interfere
with the real shadows and highlights created by the renderer.
You can experiment with removing the shadows and highlights using these presets as a starting point, then customize other
settings.
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Applies a gamma correction of 2.2.
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Applies an inverse gamma correction (1/2.2).
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HSV
Adjust , , and settings for the selected paint layer.
Curves
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Select the channel whose curve you want to edit. Select from , , , , , or channels, then adjust the corresponding curve.
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Reverts any changes you've made to the curve for the selected channel, and resets the curve to a default straight line.
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Lets you quickly convert color images to black and white, for example if you want to use the image as a bump map or as a multiplier
for another image. Select from the following options:
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(Default) Displays final color adjustments in full color.
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Converts the final result of your color adjustments to display luminance as grayscale values, replacing color in all (R, G,
and B) channels.
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Copies the content of the red channel into all of the R, G, and B channels, and discards the original G and B channel information.
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Copies the content of the green channel into all of the R, G, and B channels, and discards the original R and B channel information.
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Copies the content of the blue channel into all of the R, G, and B channels, and discards the original R and G channel information.
- Curve image
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Lets you add, delete, and move points to change the shape of the curve for the selected channel. See Adjust tool falloff for details on working with the curve image.
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When on, you can preview the effect of changes you make in the window on the paint in your scene, as you edit. (Changes are not applied until you click .)
