Edit GIF and PNG images

When you open the file within gif and png format in photoshop.

You will find that the layer is locked and can't open for editing.
If you get stuck with this problem. This little guide will show you how to edit them.

Step 1: Open gif or png file with adobe photoshop program.
You will see that the layer is index layer (locked).
And you can't do anything.

Step 2: To solve this problem, just go to menu Image=>Mode=>and Change from Indexed Color to RGB Color

Finish: Now, the layer is not lock anymore!!!

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