Photoshop Tutorials - Eraser Tools
These tools are used to remove desired parts of the image. Photoshop has three types of erasers: Eraser, Background Eraser and Magic Eraser.
Eraser simply removes the part of the image that it is applied to despite its color. It has the Mode, Opacity, Flow and aerograph mode. Erase to History option restores the image that was erased before that. You can set the shape of the Eraser: Brush, Pencil and Block.
Magic Eraser tool removes the parts of the image that are of the same color or like colors (depending on its settings). Its settings and use are similar to PaintBucket tool with the only exception - Magic Eraser erases the areas instead of filling them with other color.
Background eraser removes everything but the background, except for the color that is set by the foreground color when you enable Protect Foreground Color option. Under the Limits option you can choose one of the following:
Discontigues - removes everything
Contiguous - removes like colors that are contiguous
Find Edges - does not remove the elements with contrasting (different) colors.
The Sampling option sets the way the color is chosen:
Continuous - removes the colors evenly, as you move the mouse.
Once - removes one color that was selected with the mouse click
Background Swatch - removes only the color that matches the foreground.