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Mosaic dataset with rasters has black areas

Question asked by allen_dailey_cuesta on Dec 12, 2018
Latest reply on Dec 14, 2018 by allen_dailey_cuesta


I have created a mosaic dataset from 17 rasters (the rasters are historical map sheets that I georeferenced).  It has worked all right, EXCEPT that a couple of areas that overlap between rasters and were transparent are black.  Those areas were transparent because I had to chop off some corners of the original map images, because those parts were either duplicated or unnecessary; I did this editing in the Mac app Preview before georeferencing them. 


I already did "Build footprints," and that got rid of other, smaller black areas that existed right after I first added the rasters to the mosaic dataset.  But there are still two black areas left.  How can I get rid of them?  Why are they black instead of transparent, which is how they were before I added the rasters to the mosaic dataset?

The above part should look like this instead:  (Note: The black area above was an empty corner of the upper map sheet that I deleted using the Preview app, so that when I eventually made the mosaic dataset, either of these adjacent sheets could be on top and I wouldn't have to worry about the huge empty corner of the upper sheet covering up part of the lower sheet.)

Thank you!