You can add to the selection area using the selection tools, either the same selection tool you used to make the original selection or a different selection tool. For example, you have a picture of a person carrying a large sign. You can select the sign with the rectangular Selection tool, then add the person to the selection using the Freehand Selection tool.
You can also use the Expand command to increase a selection by a specific number of pixels or the and Select Similar commands to add to selections based on pixel color values.
To add to a selection using the selection tools:
On the Tools toolbar, choose the selection tool (Selection, Freehand, or Magic Wand tool) that you want to use to add to the selection.
On the Tool Options palette, select the tool options.
Hold down the Shift key as you click the parts of the image you want to add to the selection. The areas do not need to be adjacent.
To expand the selection by a specific number of pixels:
Choose Selections > Modify > Expand.
Select the number of pixels (1 to 100) by which you want to expand the selection.
Click OK. The marquee expands while keeping its original shape.
To add pixels to a selection based on color values:
Choose Selections > Modify > Select Similar.
Note: You'll get the best results with the Select Similar dialog if your original selection is not anti-aliased. Also be aware that in the dialog you can click the Toggle Selection button to change between showing only the selection or showing the selection and the rest of the image.
Select from these options:
Tolerance Specifies how closely pixels must match the colors of the initial selection. At low settings, the values must be close. At higher settings, more pixels match.
Sample Merged If the check box is marked, Paint Shop Pro selects matching pixels in the merged image. If the check box is cleared, Paint Shop Pro selects pixels in the active layer only.
Anti-alias Mark this check box to use anti-aliasing, which produces a smooth-edged selection by partially filling in pixels along the edge, making them semi-transparent. Mark whether you want the areas Inside or Outside the selection marquee to be anti-aliased. Clear the Anti-alias check box to keep the original edges.
Contiguous Selects all pixels of a similar color in adjacent areas.
Discontiguous Selects all pixels of a similar color anywhere within the image.
Click OK. The selection changes to include matching pixels.
Adding or Removing a Color from a Selection
Changing the Feathering of a Selection
Cleaning up the Edges of a Selection
Modifying the Select Selection Borders
Removing Specks and Holes from a Selection