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Bogus transparency in blend mask

jgarnold

jgarnold

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1,821
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australia
Firstly I hope this is an appropriate forum to post this question.
It refers to creating a blend mask using GIMP for photo realistic scenery.
I initially create a blend mask and 'paint out' all the areas on the satellite image I do NOT want to show and then display the blend mask 'layer' only to reveal any areas I did not paint out completely and then fix them by painting over and then I save, export the blend mask and create the BGL file using RESAMPLE.

I then display my photo realistic scenery and note that everything looks ok but I need to make small changes to the edges.

I go back to GIMP and make the changes only to find that upon recompiling (resample) my photo realistic scenery is much paler than it was (like I had painted over the entire area with say a 50% opacity brush).

Now comes the reason for this post.
When I reopen the blend mask (layer) in GIMP I find that there are some bogus areas which are only just visible as if I had erased small areas using the erasor tool set to opacity of about 20%. When I paint these out everything is fixed.
So what is causing these bogus areas to appear in my blend mask when I did not makes changes in those areas. Is there a method to prevent them happening when I make changes?

I have included a screen shot with a red arrows pointing to two of these bogus areas (very hard to see, sorry)

sechelt blend mask bogus.jpg
 
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