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The attached workspace takes two images - one is a georeferenced raster map with black "art" frame around, and the second is an image of the same size and in the same coordinate system containing two pieces of data, which should be put on top of the main map, and black background.
Setting NODATA value makes black color transparent, as result, we can see both main map and two extra pieces of data from another image.As a last step the workspace removes NODATA from the final TIFF image.
Setting NoData and Adding Alpha Bands to Remove Black Borders
Alpha Compositing: Blending Two Raster Images
Tiling Raster Data with the RasterTiler
Raster to Raster Translation (Geotiff to JPEG) with Reprojection
Alternative Mosaicking Method for Images with Fuzzy Edges
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