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The following samples test various forms of using the image&tile option in the BACK chunk. The first two show a static background composed of a tiled image. In the left sample the entire canvas is covered with the image, and in the right, clipping boundaries were used to limit the background image to a smaller rectangle and show the BACK color for the encompassing frame.
If the samples only show a uniform background color (possibly with a tiny image near the upper-left corner), your MNG decoder does not handle BACK image and/or tile operations. This will be the case for implementations based on libmng-1.0.4 and older.

Waves1.mng | Waves2.mng
This variation shows how to build an animation with the image&tile option of a single BACK chunk. The same clipping area as the above-right sample and the same image were used.
Waves3.mng |

Samples & images on this page are Copyright © G. Juyn

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