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Iml designer
Fundamental controls
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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Shift+cursor keys
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Move selection if any, scroll image otherwise.
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Supersampling mode
 icon switches designer to "supersampling" mode. Image is scaled 3 times by repeating pixels in this mode:
 
In supersampling mode, you can draw detailed content that will get smooth antialiased appearance when rescaled down again:
 
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.
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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