Doomsday Manual

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====== Low-level image filtering ======

The Doomsday 2 file system supports basic image filtering operations. This means that image files associated with [[:assets]] can be modified when they are loaded. The mechanism works with all assets.

To apply a filter operation, the following syntax is used:

> filePath/filterOperation

For example:

  path = "images/heights.png/HeightMap.toNormals"

   * File path is: **images/heights.png**
   * Filter operation is: "HeightMap.toNormals"

It is also possible to chain multiple operations:

  path = "images/heights.png/HeightMap.toNormals/Multiply:mask.png"

That would first load **images/heights.png**, then apply the heightmap-to-normals conversion, and finally multiply with **images/mask.png**.

^ Operation ^ Description |
| Color.desaturate | Desaturate colors of the image (convert to grayscale). |
| HeightMap.toNormals | Convert a grayscale heightmap to an RGB normal map. |
| Multiply:(path) | Multiply RGBA channels separately by the RGBA values from another image. (path) is relative to the first file. |

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