Mari 4.5v2 docs:

Colors Palette

The Colors palette and the controls that can be found on it are described in the table below.

Note: Value can go beyond 100% if picking colors from an HDR image and Saturation can go beyond 100% if picking colors from a Channel in a colorspace with a wider gamut than the color picking colorspace.

What It Does

The Colors palette lets you view and change colors. The controls on this palette all work together - as you change the color through one control, the other controls update to show your change.

Colors Palette Fields

Note: Picking values for HDR images outside of the range as defined by the color picking OCIO colorspace, may result in clamped values.

Control	Type	What it does	Notes
Swatches	swatch	These swatches store the 6 most recently selected colors and the current foreground color (the one at the top). When a new color is selected, it is added to the top of the list. Clicking on a swatch selects it as the current color (foreground color).	The current foreground color is the color that Mari uses when you paint using the Paint tool.
	button	Adds any of the following tabs: • Color History • Picker • Colorspace • Sliders • Values • Image • Blend • Gray • Analyzer
	button	Opens tabs in separate windows.
Picker
Color field	field	Click to select a color.
Color slider	vertical slider	Click and drag up and down to select a color.
Transparency/Alpha slider	vertical slider	Click and drag up and down to select the level of transparency.
H S V R G B	radio buttons	Select whether to display Hue, Saturation, Values, Red, Green, or Blue in the Color field and the Color slider.
Color swatch	swatch	The current foreground color.	The current foreground color is the color that Mari uses when you paint using the Paint tool.
Intensity	input box, horizontal slider	Enter a value in the input field or click and drag from left to right to adjust the intensity of colors to select HDR colors. HDR colors are considered to be any color with an intensity that is greater than 1.	From 0 to 4096; defaults to 4096. The maximum range of the Intensity slider can be adjusted in the Mari Preferences Dialog under Color > Color Management Defaults \| Color Picker Maximum.
Values
Source (sRGB)
	entry box, slider	Specify Hue values in degrees.	Range: 0 to 360°
	entry box, slider	Specify Saturation values in percentage.	Range: 0 to 100%
	entry box, slider	Specify Value values in percentage.	Range: 0 to 100%
	entry box, slider	Specify Red values.	Range: 0 to 255
	entry box, slider	Specify Green values.	Range: 0 to 255
	entry box, slider	Specify Blue values.	Range: 0 to 255
	entry box, slider	Specify Alpha values.	Range: 0.0 to 1.0
Target (linear)
	entry box, slider	Specify Hue values in degrees.	Range: 0 to 360°
	entry box, slider	Specify Saturation values in percentage.	Range: 0 to 100%
	entry box, slider	Specify Value values in percentage.	Range: 0 to 100%
	entry box, slider	Specify Red values.	Range: 0 to 255
	entry box, slider	Specify Green values.	Range: 0 to 255
	entry box, slider	Specify Blue values.	Range: 0 to 255
	entry box, slider	Specify Alpha values.
Image
Image field	field	Drag-and-drop an image in the image field then click the image to select a foreground color. You can also load an image by right-clicking and selecting Load Image, then selecting a file from the Load dialog box. To delete the image, right-click it and select Clear Image.	You can drag-and-drop an image from the Image Manager Palette or from a file browser.
Gray
Gradient, presets	sliders, buttons	Use this to pick a gray value from the gradient, or one of the presets.
Intensity	input box, slider	Enter a value in the input field or click and drag from left to right to adjust the intensity of colors to select HDR colors. HDR colors are considered to be any color with an intensity that is greater than 1.	From 0 to 4096; defaults to 4096. The maximum range of the Intensity slider can be adjusted in the Mari Preferences Dialog under Color > Color Management Defaults \| Color Picker Maximum.
Blend
Color field	field	This displays a field with four colors blending into each other. Click any of the color swatches (foreground color or recently used colors) and drag-and-drop them to any corners of the color field. Then click in the color field to pick from the blend.
Analyzer
Current	swatch	Displays the color of the pixel selected with the Eye Dropper tool.
Minimum	swatch	Displays the minimum color of the pixels that have been selected with the Eye Dropper tool (when Accumulate is enabled).
Average	swatch	Displays the average color of the pixels that have been selected with the Eye Dropper tool (when Accumulate is enabled).
Maximum	swatch	Displays the maximum color of the pixels that have been selected with the Eye Dropper tool (when Accumulate is enabled).
Accumulate	checkbox	When selected, keeps data on all pixels selected (until Reset), and calculates Minimum, Average and Maximum colors.
Reset	button	Clears all accumulated pixel selections, to just the Current selection.
Values \| R, G, B, A	information	Values for Red, Green, Blue, and Alpha.
Values \| H, S, V, L	information	Values for Hue, Saturation, Value, and Luminosity.
Values \| X, Y E, I	information	Values for position of pixel on x and y axis, and the pixel Exposure and Intensity.
	button	Deletes the currently displayed tab.
Colorspace
Colorspace	dropdown	The colorspace in which the colors are interpreted. Same as 8 bit Data is determined by the Color Picking control in the Project Settings, or the same control set at project creation. OCIO colorspace roles are also displayed in this list.	This colorspace can be reset to the default option by clicking . The Colorspace menu is linked to the Source column in the Values tab. See Color Swatches and Pickers preference in the Mari Preferences Dialog.
Range	dropdown	Set color values to either Byte (8-Bit), Half (16-Bit), or Float (32-Bit) .
Sliders
H S V	input box, sliders	Enter a value in the input field or click and drag from left to right to select Hue, Saturation, and Value.
R G B	input box, sliders	Enter a value in the input field or click and drag from left to right to select Red, Green, and Blue.
Alpha	input box, slider	Enter a value in the input field or click and drag from left to right to select the level of transparency.