Tolerance - determines how closely the selected pixels match the sampled pixel. A setting of 100% erases pixels to complete transparency, and a lower setting erases pixels to partial transparency. Opacity - specifies the level of opacity. You can set the following controls when you use the Background Eraser tool: For example, you can change the opacity, color tolerance, and sample area settings. You can adjust the default settings for the Background Eraser tool on the Tool Options palette. You can also erase to create an effect, such as when you want one layer to show through another layer. You can erase paint when you want to make certain pixels transparent. If you make a mistake with a paint stroke and erase it, the image detail under the stroke is lost. To understand the difference between undoing and erasing, consider the example of paint strokes. When you undo an action in Corel PaintShop Pro, the detail from the original image is restored. The difference between undoing and erasing For example, in a photo of a mountain range, you can erase the sky, or you can isolate an object from the surrounding image area. You can use the Background Eraser tool to erase pixels selectively. You can quickly remove the background from an image by using the Background Eraser tool.
A gray-and-white checkerboard pattern indicates transparent areas. When you use the Eraser tool on a raster layer, all pixels in the tool’s path become transparent. You can use the Eraser tool to erase areas of a layer to transparency. Corel PaintShop Pro Help : Retouching and restoring images : Erasing image areas
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