Posterization of the layer mask

Software
1

Hi guys,

My name is Wesley and it is the first time i post here. First of all thanks for Pat to make this really cool website where i learn a ton. I write you today because i have a problem with the preview of the layer mask. When i review it it shows like the left image whent it is in reality like the right one.

1674×875 122 KB

I am a bit confused. Can you explain me why it happens?

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What program are you talking about?

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Oh sorry i forgot to mention. It’s Gimp.

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See this, it’s relevant to every program:
http://rawpedia.rawtherapee.com/How_to_write_useful_bug_reports

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How did you create the layer mask? (What are the steps you followed to get to the posterized result)?

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Thanks for the link i’ll read it carefully

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I follow your tutorial on luminosity mask revisited. I did the exact same step. In the channel layer the mask look perfect but i apply it on a layer and display the mask it look posterize. But the funny thing is if i apply it to the layer the result is clean. It is very weird.

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8

That is odd. So too say it works just fine as a mask, but displays posterized when you set the mask to visible?

What version of GIMP are you on?
Could you upload a sample .xcf file that this happens in? (You can use a service like http://filebin.net)

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This is exactly that. I use gimp gimp 2.8 and gimp 2.9.3. The file is available here.

http://filebin.net/65ic2k26ws/MaskIssue.xcf

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10

I can confirm that I see the same thing, and it looks like it might be be a bug. I’ve filed a report here:

https://bugzilla.gnome.org/show_bug.cgi?id=761720

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Thanks for reporting. It can be a real problem when refining the mask for sublte retouch. And thanks for this website this is really cool. If i notice some others bugs i’ll report it.

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