I discovered that starting with v2.10.24 Gimp knows about and keeps geotiff tags intact.[0] This means we can use tools like Magic Wand fuzzy select and a host of other tools to quickly fix a host of image issues that are difficult to address using command line tools and/or code.
It gets better: Gimp reads *.msk files without any fuss. This means drastically reduced memory requirements for quickly making simple edits only to the mask layer. So a person can: - take a large multiband band geotiff with a mask side car file, squash the 3+ bands into 1 band - open the original .msk file in Gimp - drag and drop the squashed 1 band file on top the Gimp session o selecting import tif as a Layer - Lock the imported layer, set to 50% transparent (or whatever). This is the Visual Guide layer. - Paint as thou wilt on the base mask layer (Black is Nodata, White is Data) - Delete the visual guide layer - Export the base mask layer o Select tiff File Type § use Deflate compression § keep metadata (Geotiff will be disabled, that’s okay) § use “input-rgb-geotiff.tif.msk” as file name - DONE! (this is so awesome. :) -Matt
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