Icon Designer
1. Fundamental controls
Left mouse button
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Draws the current color.
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Right mouse button
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Picks current color.
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Shift+Left mouse button
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Flood fill.
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Ctrl+Left mouse button
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Flood fill with color tolerance.
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Alt+Left mouse button
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Flood fill with larger color tolerance.
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Shift+cursor keys
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Move selection if any, scroll image otherwise.
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Mouse wheel
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Zoom in / out
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2. Supersampling
 icon scales 3 times by repeating pixels:
 
After drawing detailed content that will get smooth antialiased appearance when rescaled down again using  :
 
Scaling up and down algorithms are paired in a way that is loss-less for unaltered parts of image. It is therefore possible to edit parts of already supersampled Image without problems.
 and  provide identical function scaling two times.
 button activates "supersampled preview" - in addition to the real size, preview also shows 2x and 3x downscaled images.
3. Interpolation
Interpolation  is a function that fills transparent areas with colors created by smooth interpolation of non-transparent pixels in the area:
 
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