Open ur image and go to Layer-transparency-Add alpha channel
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Then go to the free select tool
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And start selecting around the char u want
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Then, when u have it all selected go to Select- Invert
And then use the eraser tool to erase the white (if it stays white or other color, make sure it as alpha channel)
And then use the eraser tool to erase if there is still some white around the render
It should look like this
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(I know i used a white background image, but do the same exact thing with another image)