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But often, this is not as easy as that. So you can use 3 technics for the not so simple cases :
- try to limit the working area by doing a selection
- then use the tool several times by clicking on a region with the color to remove and dragging while maintaining the mouse down to enlarge the color range.
- when too much colors are removed, don't hesitate to do some undos, as you may know that LiveQuartz supports unlimited undos from document opening