Doomsday Manual

--- assets:low-level_image_filtering [2017-03-13 15:13] – skyjake
+++ assets:low-level_image_filtering [2018-12-15 18:35] (current) – skyjake
@@ Line 1: / Line 1: @@
+====== 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. |