heads up if you ever use gimp for redacting screenshots and the like 

with the default settings, "clear", or the delete key, only makes a region transparent but doesn't delete the colour info. it can easily be retrieved

ways to fix this are:
1. uncheck "save colour values from transparent pixels" when exporting
2. put a fresh transparent layer underneath everything, its colour info (pure black) will be saved instead
3. just fill the area with a solid colour instead
3.1. or save as jpeg

re: heads up if you ever use gimp for redacting screenshots and the like 

@codl Does the clipboard preserve alpha? I usually use crtl-v. Doesn't seem it does.

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re: heads up if you ever use gimp for redacting screenshots and the like 

@tonf @codl copying from gimp preserves it, even when using the "Copy visible" option.

re: heads up if you ever use gimp for redacting screenshots and the like 

@jomo @codl Weird, because I tried that and it just appeared as a black square. Are you using Linux?

re: heads up if you ever use gimp for redacting screenshots and the like 

@tonf @codl Using macOS. I tried copying from GIMP into GIMP and the color was still there. Copying from or to Firefox does not seem to preserve it, though.

re: heads up if you ever use gimp for redacting screenshots and the like 

@jomo @codl Indeed, I should try Gimp to Gimp. I thought Windows might be eating the transparency with its rather clumsy clipboard, but it may be Firefox.

re: heads up if you ever use gimp for redacting screenshots and the like 

@jomo @codl Well this is weird. Disabling alpha channel leads to the entire image disappearing. Maybe this behaviour is different in older versions of gimp? Because I haven't updated in a while.

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