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A second click has added a new color-select point and the checkerboard now shows all shades of the sky are included. Each new click will add a new color-select point and add the color under the point (and nearby colors) to the selection. When you have multiple color-select points the Tolerance and Fade controls apply to the whole selection, not just to a given control point.  Now that I have the whole sky selected, I can make other adjustments using the normal Enhance controls. Original image More blue You’re on Mars

Selecting separate areas of color

When any color-select handle is shown red, it means that selection region is active, and that additional clicks will add to that region. Adjusting any Enhance sliders will affect only this region. But suppose you want to select a different part of the image, that you want to enhance separately.  In this case you can de-select the active color-select points by right clicking on a control point and choosing Deselect or pressing the Esc key once. Important: As long as the color-select mode is on, i.e. when the icon is showing selected like this   all clicks on the image will add a new color-select handle AND any adjustment of Enhance slider values will apply only to the selected colors.  This means that the normal click-drag short-cut for the crop feature will not work. Click the icon again to exit from color-select mode. Now drags will perform a crop, and adjusting

Xara Designer Pro X10 release notes