Once you make a selection, you can use the Grow command or the Similar command to expand the selection to include similar colors. Creating objects from selections You can make new paint objects from image selections with the New Image from Selection command. This command converts a selection in an image into a new paint object in the same position on the image you are editing. This can be useful for “layering” image composi- tions. The result of New Image from Selection is similar to moving a selec- tion to a transparent “layer,” a procedure used in some image editing programs. In Canvas you can use separate transparent paint objects to create “layered” image compositions. Note: This operation doesn’t affect the Clipboard contents. To create a paint object from a selection:  With a selection in an image, choose New Image from Selection in the context menu. To display the context menu, right-click (Windows) or Ctrl-click (Mac) in the document. New images from selections and floating selections When you choose New Image from Selection, Canvas removes the selection from the image or deselects the selection in the image. The selection appears as a new paint object in the same location. Whether a selection is removed from an image depends on whether the selection is floating. The opacity of the resulting object also dif- fers for floating and non-floating selections. If a selection is not floating, Canvas deselects it but otherwise doesn’t change the original image when you create an object from the selec- tion. The selected pixels keep their original opacity in the new object. If a selection is floating, Canvas removes the selection. The effect is the same as deleting a selection: the background color replaces the selected pixels, or, if the object has a visibility mask, a clear back- ground replaces the selected pixels. In the new object, the pixels are opaque, regardless of their original opacity. Clear backgrounds in new paint objects A paint object created from a selection always has a clear, rather than opaque background, and a visibility mask.
Canvas 8 Help: Selections and channels (14 of 32)                                                   Page #664