What should I do if the PS mask brush is not responding?

What should I do if the PS mask brush doesn’t respond?

Option 1: Set the brush to normal mode

Sometimes mistakes made in PS will seem very stupid, but it is undeniable that sometimes That's it. If you have confirmed that the layer mask is selected, but you still cannot use the brush, you should first check the blending mode of the brush. If the blend mode is in anything other than normal mode, be sure to set it back. Also just in case, when working on the layer mask, set the brush to a standard circular stroke and set the color to black or white.

Related recommendations: "ps tutorial_photoshop image processing tutorial"

Option 2: Adjust the opacity of the brush And Flow

When you see that the effects of operations on a layer mask are very difficult to see clearly, one of the reasons is that the brush opacity or brush flow is set to a low value. Opacity and flow both control the amount of black and white on the canvas. If you set the opacity and flow very low, say 1%, you'll barely see the color on the canvas. If you set both options to 100% first, then turn both options down if you need less color.

The effect of using the brush tool under 1% opacity and 100% opacity is as shown below:

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