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I have an image that I would like to pixelize, but after pixelizing I have colors with transparency (antialiased).

How would I prevent this?

enter image description here

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    What does the imgae look like before pixelizing? – usr2564301 Nov 3 '18 at 13:27
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After applying the effect, if you save or export the image as .gif format with transparency, the semi-transparency disappears, since the .gif format only supports one color 100% transparent.

The smoothing pixels are transformed into flat colors blurred to white.

enter image description here

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I am not a Paint(dot)net user, however the following steps should work in almost any raster image editing software generally. Begin with the original unedited image, but instead of applying a filter to pixelise, do it manually as follows:

  1. Check the size of the image, and write down the width and height in pixels.

  2. Scale/resize the image down to something like 30px wide or 30px high, but switch of the interpolation. In Photoshop this is called "nearest neighbour", I think it's also the same in Paint(dot)net, and in GIMP it's called "none". These options are in the scale/resize image dialog.

  3. Finally, scale the image back up to the original size, using the same interpolation setting.

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