Normal layer
Open a picture, the default is the background, the background layer is usually locked, we only need to double-click the layer to unlock it
Index layer
Since paper printing cannot output all the colors that can be displayed on the computer screen, the index will fix the colors that can be output, so that the effect on the monitor The output effect will not be much different.
Click [Image]-[Mode], change [Index] to [RGB Color] to unlock
Recommended tutorial:ps Tutorial
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