Adjustments

Category: mental ray > Output

Shader Family: Output

Output: Color

This shader allows you to adjust the color levels of your rendered image.

Name	The name of the shader node displayed in the render tree. Enter any name you like, or leave the default.
Brightness	Adjusts the overall brightness of the color. Negative values make the color darker and positive values make the color brighter. The default value is zero and causes no color change.
Contrast	Adjusts the variation of brightness in an image. Negative values shift the colors towards a neutral gray, while positive values make brights brighter, and darks darker. The default value is zero and causes no color change.
Hue	Changes color in an image: greens can become yellows, reds can become blues. The value specified here is the number of degrees to rotate on the color wheel. The default value is zero and causes no color change.
Saturation	Adjusts the "purity" of a color. Negative values mix in grays to make pastels and lower the colors' saturation, while positive values remove grays and raise the saturation. The default value is zero and causes no color change.
Lightness	Very similar to Brightness, it adjusts the overall lightness of a color, but uses a slightly different technique. Negative values bring the color to black and positive values bring the color to white. The default value is zero and causes no color change.
Levels: These options allow you to adjust the overall lighting levels of your image by darkening or lightening shadows and highlights. The value for each of the RGB channels for each pixel is adjusted on output according to where it falls within the input range: Values between Input Low and Input High are remapped to a proportional value between Output Low and Output High. Values below Input Low are remapped to Output Low. Values above Input High are remapped to Output High.
Input High	Sets the highest value for the input range. You can set values between zero and 255.
Input Low	Sets the lowest value accepted within the input range. You can set values between zero and 255.
Input Shift	Input Shift will gamma correct the color. A value of 1.0 corresponds to no gamma correction.
Output High	Sets the highest value for the output range. You can set values between zero and 255.
Output Low	Sets the lowest value for the output range. You can set values between zero and 255.
Specific Region	By default, all of the image is affected. Enabling Specific Region causes the effect to apply to only those pixels whose tag matches the values in the Region Labels list. The label image and any user defined framebuffers of type TAG (object label) are used by the selection process.

Region Labels

Creates a region labels list to specify which regions will receive the effect.

Add	Adds a region Item to the list.
Clear	Removes all region Items from the list.
Item	A Item port (parameter) representing a single region in the list. Enter a value for the region label.
	Click the Edit Item icon to Remove, Rename, Move Up, and Move Down each Item entry in the list. Once an Item is removed from the list, it no longer influences the effect created by the shader. In most cases, the position of an Item in the list indicates its order of evalution. Changing the evaluation order (moving Items up and down in the list) can impact the final output results of the shader.

Render Tree Usage

This output shader is applied using a pass shaders stack. For more information, see Applying Shaders to Partitions [Rendering].

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