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The Book of GIMP by Karine Delvare, Olivier Lecarme

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17.9 The Combine Filters

The filters in the Combine menu are used to combine two or more images. We omit Film-strip, since film is rarely used nowadays.

Depth Merge

Depth Merge merges two images using two image maps as guides. It requires four images in total, and they must all be the same size. An image map must be grayscale. The dark areas correspond to areas that will be visible in the associated image, and light areas of the map will be transparent areas in the associated image. In other words, the map acts as a mask.

The images shown in Figure 17-139 and Figure 17-140 were used to demonstrate the filter. First they were cut and scaled until they were the same size. To build the maps shown in Figure 17-141 and Figure 17-142, we did the following: ...

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