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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Jacob Christian Munch-Andersen‏ @NoHatCoder 21 Sep 2015
      Replying to @cmuratori

      @cmuratori You need some form of supersampling for heavy downscaling, sampling method doesn't matter much, as long as you do enough samples.

      1 reply 0 retweets 0 likes
    2. Jacob Christian Munch-Andersen‏ @NoHatCoder 21 Sep 2015
      Replying to @NoHatCoder

      @cmuratori I can't believe that Photoshop hasn't got this feature.

      1 reply 0 retweets 0 likes
    3. Casey Muratori‏ @cmuratori 21 Sep 2015
      Replying to @NoHatCoder

      @NoHatCoder Not sure what you mean by "supersampling" in this case?

      1 reply 0 retweets 0 likes
    4. Jacob Christian Munch-Andersen‏ @NoHatCoder 21 Sep 2015
      Replying to @cmuratori

      @cmuratori Lots of samples per output pixel. There is a wealth of different specific methods, all of them should produce better results.

      1 reply 0 retweets 0 likes
    5. Casey Muratori‏ @cmuratori 21 Sep 2015
      Replying to @NoHatCoder

      @NoHatCoder That doesn't really make any sense? You know exactly all the pixels that are in the original image. You don't need to sample.

      1 reply 0 retweets 0 likes
    6. Casey Muratori‏ @cmuratori 21 Sep 2015
      Replying to @cmuratori

      @NoHatCoder Any "dense sampling" of the image can still be trivially reduced to a weighted sum of the covered pixels.

      2 replies 0 retweets 0 likes
    7. Jacob Christian Munch-Andersen‏ @NoHatCoder 22 Sep 2015
      Replying to @cmuratori

      @cmuratori Yes, but I'd still call it a sampling pattern. In any case, what actually happens when you choose "bilinear" is that it takes

      1 reply 0 retweets 0 likes
    8. Jacob Christian Munch-Andersen‏ @NoHatCoder 22 Sep 2015
      Replying to @NoHatCoder

      @cmuratori one weighted sample of 4 pixels for every output pixel, leaving most of the original image completely untouched.

      1 reply 0 retweets 0 likes
    9. Casey Muratori‏ @cmuratori 22 Sep 2015
      Replying to @NoHatCoder

      @NoHatCoder No, nobody does that, not even Photoshop :)

      2 replies 0 retweets 0 likes
    10. Jacob Christian Munch-Andersen‏ @NoHatCoder 22 Sep 2015
      Replying to @cmuratori

      @cmuratori Do you have a better explanation why the result looks like it does?

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 22 Sep 2015
      Replying to @NoHatCoder

      @NoHatCoder Sure. It's standard sampling theory, and the expected result for the filters they have.

      12:10 AM - 22 Sep 2015
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori 22 Sep 2015
          Replying to @cmuratori

          @NoHatCoder You can start with Mitchell if you're new to this: http://www.cs.utexas.edu/~fussell/courses/cs384g-fall2013/lectures/mitchell/Mitchell.pdf …

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 22 Sep 2015
          Replying to @cmuratori

          @NoHatCoder I also suspect they don't handle gamma correctly, so their results are even worse than what would already be bad results.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Jacob Christian Munch-Andersen‏ @NoHatCoder 22 Sep 2015
          Replying to @cmuratori

          @cmuratori Here is a test, try downscaling this image to 25x25. Any sane filter should produce close to grey:pic.twitter.com/J58Z9y1bcI

          0 replies 0 retweets 0 likes
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