KrisVDM Posted August 19, 2010 Share Posted August 19, 2010 How to reproduce: - Start from a new image - Set primary color to red: 153, green: 179, blue: 204 - Use Paint Bucket to fill entire image with this color - Choose Paintbrush tool, set Brush width to 200, Fill to solid color, antialiasing enabled, normal blending - Draw a bit - Choose Magic Wand, set selection mode to replace, flood mode to contiguous, Tolerance to zero - Click anywhere in the image where you did not draw Expected outcome: everyting is selected Actual outcome: everything is selected, except some pixels left at the edges of the brush circles PDN version: 3.5.5 running on Windows 7 64 bit I expect there is a rounding error in the normal blending of the atialiased pixels. Either the antialiased pixels do not have the same color (they are expected to have a different alpha, but the same RGB), or the alphablend has a rounding problem. Blending a color with itself should yield the same color. I often use this technique to remove noise in what should be solid color regions. Looks like that's not a good idea... Quote Kris VandermottenDownload my Paint.NET Effects Link to comment Share on other sites More sharing options...
APShredder Posted August 19, 2010 Share Posted August 19, 2010 This repros for me. However while testing this out I noticed that works on most most colors except for: Black (0, 0, 0) White (255, 255, 255) Red (255, 0, 0) Green (0, 255, 0) Blue (0, 0, 255) Yellow (255, 255, 0) Cyan (0, 255, 255) Magenta (255, 0, 255) It seems that if all the sliders are set to 0 or 255 then the rounding error or whatever is causing this problem doesn't seem to take place. Quote BlendModes Plus | Dissolve | Extract Color Link to comment Share on other sites More sharing options...
Rick Brewster Posted August 19, 2010 Share Posted August 19, 2010 This is just how GDI+ is doing things. Oh well. Quote The Paint.NET Blog: https://blog.getpaint.net/ Donations are always appreciated! https://www.getpaint.net/donate.html Link to comment Share on other sites More sharing options...
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