I've created image mosaic that does not entirely cover its bounding box and got black holes in the places without tif file for that place. I know I can use
OutputTransparentColor: #000000 to make it transparent, but tif files have white color as a background. So either I have transparent color for absentee tif files or transparent color for area just around raster.
I could set black color as a background for all tifs to make
OutputTransparentColor: #000000 work, but it'll take time. Is there a way to make both these colors transparent?