Geog Image Map Shader - Colour Tab

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This tab has settings which control how the Geog Image Map Shader generates colour information from the image.


  • Apply colour: If this is checked the shader will generate colour from the image.
  • Smooth interpolation: Check this to smoothly interpolate colour values from the image. If this is unchecked no interpolation is used and colour is taken from the pixel at the point being shaded. This will give a blockier result than using smooth interpolation.

  • Unpremultiply: If this is checked the shader will unpremultiply image colour values with the image alpha values. If you see odd fringes along the edge of transparent parts of the image you could try changing this parameter.

  • Convert to linear: If this radio button is checked then it's assumed the image is gamma corrected and a conversion is done to convert it to linear colour space. The gamma value used for conversion is specified in the Conversion gamma parameter below.

  • Data is linear: Check this radio button if the image is in linear colour space (i.e. it hasn't been gamma corrected).

  • Conversion gamma: This is the value used for gamma conversion if the Convert to linear radio button is checked.

Back to: Geog Image Map Shader

A shader is a program or set of instructions used in 3D computer graphics to determine the final surface properties of an object or image. This can include arbitrarily complex descriptions of light absorption and diffusion, texture mapping, reflection and refraction, shadowing, surface displacement and post-processing effects. In Terragen 2 shaders are used to construct and modify almost every element of a scene.

A single element of an image which describes values for color and/or intensity, depending on the color system which the image uses. Groups of ordered pixels together form a raster image.

A parameter is an individual setting in a node parameter view which controls some aspect of the node.