This tutorial introduces some basic image dissolving methods. Before melting the image, the author very cleverly made the dark lines of the character's outline, so that the picture will be much clearer after melting. There are many ways to dissolve images, and you can also try other methods.
Original picture
final effect
1. Open the character material, copy the layer, and hide the copied layer.
2. Select layer 0 and execute: Filter >> Blur >> Special Blur.
3. Select >> Color Range and select black.
4. Delete, invert the selection (Ctrl + Shift +I), Edit >> Fill, and fill it with black.