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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Will Dormann‏ @wdormann Jan 10
      • Report Tweet
      • Report NetzDG Violation

      Now that Twitter has changed how it handles uploaded images, this unexpected behavior is perhaps more important now than before. Your challenge: Tell me what I've redacted from this image. (Anybody I've talked to about this so far is ineligible to play) It can be done w/o tools.pic.twitter.com/Gg4WXFBljR

      53 replies 520 retweets 1,264 likes
      Show this thread
    2. Will Dormann‏ @wdormann Jan 10
      • Report Tweet
      • Report NetzDG Violation

      Answer: Several apps (e.g. @GIMP_Official, @Apple Preview) do not actually delete content from images with an alpha channel. They simply create an alpha-channel tunnel through the content you think that you're removing. You may think you've removed content, but it's just hidden.pic.twitter.com/vCWi80CH33

      5 replies 48 retweets 150 likes
      Show this thread
    3. ChristopheVanlancker‏ @Carroarmato0 Jan 25
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      Replying to @wdormann @GIMP_Official @Apple

      Wait... this Bug/Feature is still around? :')

      2 replies 0 retweets 0 likes
    4. Will Dormann‏ @wdormann Jan 25
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      • Report NetzDG Violation
      Replying to @Carroarmato0 @GIMP_Official

      Indeed! The GIMP developers have indicated that people do not expect the "Delete" key to delete pixels. Who knew? https://gitlab.gnome.org/GNOME/gimp/issues/4487 …pic.twitter.com/2RSytIgqnR

      2 replies 0 retweets 1 like
    5. GIMP‏ @GIMP_Official Jan 26
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      Replying to @wdormann @Carroarmato0

      Yes, the anti-erase option of the Eraser tool didn't come from nowhere :) People requested it

      1 reply 1 retweet 3 likes
    6. Will Dormann‏ @wdormann Jan 26
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      Replying to @GIMP_Official @Carroarmato0

      Undo is a thing that I could expect people to want. But to implement an anti-erase feature that persists through the act of exporting to a completely new file format... That's unique. As in, can you name a single other photo editing program that does this?

      1 reply 0 retweets 1 like
    7. Gérald Maruccia‏ @UnDemiCoeurNoir Jan 26
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      Replying to @wdormann @GIMP_Official @Carroarmato0

      Once again Gimp does nothing weird but following PNG specs https://www.w3.org/TR/PNG/  if you want get rid of Alpha informations just choose to do so at exporting your file. If other photo editing programs don't give you that choice, they are the wrong ones.

      1 reply 0 retweets 0 likes
      Will Dormann‏ @wdormann Jan 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @UnDemiCoeurNoir @GIMP_Official @Carroarmato0

      My complaint is not what GIMP does with alpha information. My suggestion is that GIMP is perhaps doing the wrong thing when a user hits the "delete" key on their keyboard. I suspect that I'm not in the minority in thinking that "delete" "deletes" things instead of "sets alpha"

      7:52 AM - 26 Jan 2020
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Michael Schumacher‏ @schumaml Jan 26
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          Replying to @wdormann @UnDemiCoeurNoir and

          Somewhere in this thread I have suggested that a dedicated Redaction tool, a possibility to check image content on export and options to define what happens with transaprent pixels on export (like the PNG export already allows for) are what we need here.

          1 reply 0 retweets 1 like
        3. GIMP‏ @GIMP_Official Jan 26
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          Replying to @schumaml @wdormann and

          Or just use https://gitlab.gnome.org/World/obfuscate  ;-)

          1 reply 0 retweets 1 like
        4. 1 more reply
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        2. Gérald Maruccia‏ @UnDemiCoeurNoir Jan 26
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          Replying to @wdormann @GIMP_Official @Carroarmato0

          It's normal and expected in an image manipulation program that setting alpha to 100% ≠ delete !!! You make that pixel transparent, you do not delete it. If you need « redacting » ensure you completely (re)move undesired pixels.

          1 reply 0 retweets 0 likes
        3. Gérald Maruccia‏ @UnDemiCoeurNoir Jan 26
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          Replying to @UnDemiCoeurNoir @wdormann and

          Regarding image manipulation, « redacting » is a bit out of scope, it's a semantic purpose, sort of. Once you understand how pixel-material work, choose the right method to hide or melt or alter or delete them.

          1 reply 0 retweets 0 likes
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