9.5.2

868 • CHAPTER 18
THE SHADERS • 869
Filter
The Filter shader lters another shader or a bitmap. You can use it to adjust a shader or bitmap’s
brightness, contrast, hue, saturation and gamma, and you can also clip the color.
The Filter shader is especially useful for adjusting HDRI textures (Advanced Render module only). For
example, high-contrast HDRIs with bright lights usually cause ickering in the animation. You can
quickly resolve this problem by adjusting the Gamma value.
Texture
This is the texture or shader to be ltered.
Hue, Saturation
These parameters affect the texture’s hue on the color wheel and the total saturation respectively.
Lightness
The lightness of the color, from black (-100%) to white (100%).
Colorize
If this option is enabled, the texture will be converted to grayscale. You can then color the grayscale
texture using the Hue and Saturation settings.