What are the differences between using the eraser tool in PS to sample continuously, sample once, and sample the background color palette?

The difference between the three sampling methods of the PhotoShop eraser tool is:

Select the "Sampling" option: "Continuous" to continuously take color samples as you drag;

"Once" only erases the area containing the color of the first click;

"Background Swatch" only erases the area containing the current background color.

PhotoShop's eraser tool has three sampling methods: continuous, once, and background color plate.

These three methods have their own very unusual effects.

Continuous: If the center of the "+" cursor moves continuously, the sampling point will also be continuously changed. At this time, the erasing effect is more continuous.

Once: Click the center of the "+" cursor and press the mouse to sample the color. Without releasing the mouse button at this time, the sampled color can be easily erased without worrying about the "+" character. The center will move to other parts of the screen. To sample other colors, just release the mouse and press the mouse again to repeat the above operation.

Background color palette: The "+" cursor has no effect at this time. At this time, the background eraser tool only erases the background color and colors with similar tolerances. ?Select the restricted mode of erasure.

"Discontinuous" erases the sample color that appears anywhere under the brush; "Continuous" erases the area that contains the sample color and is connected to each other; "Find Edge" erases the connected area that contains the sample color. Also better preserves the sharpness of shape edges. In fact, the limitations of these three types are not obvious. It is recommended to use the "discontinuous" option.

When erasing the background, the edge noise left behind is quite serious. ?

If you use the background eraser tool again and want to remove these edges, it will be easy to erase the images that you do not want to be erased.

Especially when using "continuous" and "once" sampling, it is easy to erase images that you do not want to erase. Use the eyedropper tool to set the color of the image that you do not want to erase as the foreground color. In this way, if you check the "Protect foreground color" option, you won't wipe the areas you don't want to wipe. Extended information

PS background eraser tool cutout skills

1. Sampling continuously, sampling once, sampling the background color plate?

Sampling continuously: select sampling continuously When smearing the picture, the crosshair will continuously sample colors along the moving trajectory as the brush moves, and all the sampled colors will be erased by the eraser.

Sample once: When you choose to sample once to smear the picture, click and press the left button to sample once at the position of the crosshair. As long as you don't let go of the left button, only one color sampled will be cleared when smearing. . ?

Sampling the background color plate: At this time, the crosshair has no effect, and only the "Background Color" content in the toolbox will be cleared when smearing. ?

2. Restricted mode: "Discontinuous" erases the sample color appearing anywhere under the brush; "Continuous" erases the area that contains the sample color and is connected to each other; "Find Edge" erases the area containing Samples connected areas of color while better preserving the sharpness of shape edges. ?

3. The "Protect Foreground Color" option, as the name suggests, is used to protect the foreground color from being cleared when clearing the background.