Filter Functions

A list of the filters available in Mari, where to find them, and how to apply them can be found in the table below.

Function	How to access it	What it does	Opens this dialog box	Notes
Apply Invert filter	• Menubar \| Filters > Invert	Inverts the colors in the selection’s alpha channel. Replaces colors with their “opposite” in the color chart. For example, replaces a color with a float value of 0.3 with a color with float value 0.7.	Apply Invert
Apply Luminosity filter	• Menubar \| Filters > Luminosity	Outputs just the luminosity value of each pixel in the selection. That is, it outputs a grayscale image based on the brightness of every pixel in the original image.	Apply Luminosity
Apply In Blur filter	• Menubar \| Filters > Blur > Blur	Applies a standard blur to the selection.	Apply Blur	You can select the blur radius - the number of pixels Mari uses when calculating the blur value for each pixel. The higher the radius, the more blurred the results. If you use a larger blur radius, you may get slight lines on the boundaries between patches. This is an artifact of the way that Mari handles patch edges. This filter is not supported with Ptex channels.
Apply Soften Blur filter	• Menubar \| Filters > Blur > Soften	Applies a subtle softening blur. This is a quick, predefined blur filter. If you need more control over the degree or type of blurring, use either the standard Blur or Gaussian Blur filters.	Apply Soften	This filter is not supported with Ptex channels.
Apply Gaussian Blur filter	• Menubar \| Filters > Blur > Gaussian	Applies a Gaussian blur. Compared to the standard Blur filter, this gives you much finer control over the degree of blurring, and the option of using much higher blur values.	Apply Gaussian	You can select the blur radius. The higher the radius, the more blurred the results. If you use a higher blur radius, you may see artifacts along the boundaries of geometry shells and UV patches. This filter is not supported with Ptex channels.
Apply Gamma filter	• Menubar \| Filters > Gamma	Changes the gamma levels in the selection.	Apply Gamma	Do Inverse reverses the gamma conversion. That is, a higher setting for Gamma results in a more washed-out looking image.
Apply sRGB To Linear Filter	• Menubar \| Filters > sRGB To Linear	Applies an sRGB to linear colorspace conversion.	Apply sRGB To Linear	Checking Invert applies a linear to sRGB colorspace conversion.
Apply Hue filter	Menubar \| Filters > Hue	Changes the hue, saturation, and value of the colors on the model.	Apply Hue	To change the hue of the colors, set the value for Hue. This moves the colors around the color wheel. The rotation value is the degree around the color wheel that each color shifts, between 0 and 360 (which both correspond to the original colors). The options to change the Saturation are: • Saturation - how much saturation is applied. Select a multiplier from 0 to 2, where 1.00 is the original saturation value. • Offset - an offset value to add to the initial saturation value, before applying the scale. You can also edit the Saturation curve. This controls how the filter translates current saturation values to new values. For each input value along the bottom of the graph, the output value is set from the position of the line above that point. Edit the curve by:
				• pulling the anchor points, • clicking between anchor points to add a new point, and • right-clicking to select from a set of preset values. You can edit the Scale, Offset and Value curve for the value of the colors in the same way.
Apply Brightness filter	• Menubar \| Filters > Brightness	Changes the brightness of the paint, either overall or for specific color channels. You can also change the contrast.	Apply Brightness	You can either change the brightness of all color channels at once, or one- by-one. Changing the main Brightness control changes (overwrites) any changes you make to brightness values for individual color channels.
Apply Contrast filter	• Menubar \| Filters > Contrast	Changes the contrast of the paint.	Apply Contrast	You can select the amount of contrast using the slider.
Apply Clamp filter	• Menubar \| Filters > Clamp	Clamps color values to lie within the specified upper and lower values.	Apply Clamp	Set the Upper Value and Lower Value by adjusting the sliders or entering values in the entry boxes. Select the individual Color Component to clamp in the dropdown menu.
Apply Levels filter	Menubar \| Filters > Levels	Changes the color levels in the paint, by setting the white point, midtone, and black point.	Apply Levels	You can change the levels of all color components or each color component separately. You can set the: • Color Component - whether this affects all color components, or a specific one (Red, Green, or Blue). • White Point - the upper limit of displayed color intensity. Areas with a value higher than this are mapped to 1 (white). • Midtone - the middle point between white and black. Mari remaps the values so that this is the middle of the range between the white point and black point. Moving this pushes the values towards that end of the spectrum. • Black Point - the lower limit of displayed color intensity. Areas with a value lower than this are mapped to 0 (black).
				• White Output Level - how strongly to output the white in the filtered image. Higher values show the entire white output, lower values show decreasing amounts. • Black Output Level - how strongly to output the black in the filtered image. Higher values show the entire black output, lower values show decreasing amounts.
Apply Color Curves filter	• Menubar \| Filters > Color Curves	Changes the color curve for each color component (RGB) in the painting.	Apply Color Curves	You can also edit each color curve, controlling how each color component appears on-screen. This controls how the filter translates current color values to new values. For each input value along the bottom of the graph, the output value is set from the position of the line above that point. Edit the curve by: • pulling the anchor points, • clicking between anchor points to add a new anchor point, • right-clicking to select from a set of preset values.
Apply Color Switches filter	• Menubar \| Filters > Color Switches	Turns individual color components on or off.	Apply Color Switches	Use the checkboxes to select which color components are displayed. When Mari applies the filter, it removes any unchecked color components from the painting.
Apply Tone Mapping filter	• Menubar \| Filters > Tone Mapping	Varies the “exposure” of the painting.	Apply Tone Mapping	You can set the: • White Point - the upper limit of color intensity displayed; any colors of greater intensity map to white. • Exposure - lower exposures give darker images; higher exposures give lighter ones.
Apply Copy Channel filter	• Menubar \| Filters > Copy Channel	Copies the value from one RGB color component to the other two. The result is a grayscale image with the intensity values from the selected component.	Apply Copy Channel	Select the source component from the list. When you apply the filter, Mari copies the selected component over the other two components.
Apply Premultiply Alpha filter	• Menubar \| Filters > Premultiply Alpha	Either pre- or post- multiplies the alpha in the selected image. If you are painting using an image without premultiplied alpha onto one with it, use this filter to perform the premultiplication, so the images match and you avoid lines around the outside of the patch. Post-multiply works the same, but in reverse (removes premultiplication to match images that do not have premultiplied alphas).	Apply Premultiply Alpha	If the Postmultiply box is checked, the premultiplied alpha is removed.
Apply Edge Detect filter	• Menubar \| Filters > Edge Detect	Finds “edges” (transitions between colors) in the image and heightens them.	Apply Edge Detect	This filter is not supported with Ptex channels.
Apply Emboss filter	• Menubar \| Filters > Emboss	Applies an “emboss” effect, so that textures look “raised” on the surface.	Apply Emboss	This filter is not supported with Ptex channels.
Apply Sharpen filter	• Menubar \| Filters > Sharpen	Removes 'fuzziness' and clarifies detail in the image.	Apply Sharpen	You can set the amount of sharpening. Higher values mean more sharpening, while a value of 0.00 is the picture without the filter applied. This filter is not supported with Ptex channels.
Apply High Pass Filter	• Menubar \| Filters > High Pass	Removes low frequency information from the image while maintaining higher frequency detail. This can be useful for quickly creating specular maps where only the higher frequency image highlights are maintained.	Apply High Pass	You can set the kernel size (the amount of filtering) by adjusting the Radius. If you use a large radius, you may get slight lines on the boundaries between patches. This is an artifact of the way that Mari handles patch edges. This filter is not supported with Ptex channels.
Apply OCIO Colorspace filter	• Menubar \| Filters > OCIO Colorspace	Applies a a given OCIO colorspace to the current channel or painting.	Apply OCIO Colorspace	Set the colorspace of the current channel or painting in the Input Colorspace dropdown. Set the colorspace correction to apply to the current channel or painting in the Output Colorspace dropdown.
Apply Add Noise filter	• Menubar \| Filters > Add Noise	Applies noise to the current channel or painting.	Apply Add Noise	Use the Amount slider to adjust how much noise is applied and select the component you want to affect from the Color Component dropdown. For additive grayscale noise that modifies the intensity while retaining the original color, check the Grayscale checkbox. You can regenerate the noise using different random samples by dragging on the Seed slider. Adjust the size of the noise applied by dragging on the Size slider.

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