I exported some sprites from the game Half-Life; however, they seem to have tones of black instead of the alpha channel. For example:
How do I convert the black colors into alpha/transparency?
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Assuming you are using Windows, I recommend the freeware Irfanview.
When you Save as PNG, select the options Save Transparent Color and Save Transparency as Alpha channel. As you are saving a dropper will allow you to click on an area with the color you want to define as Alpha (in this case Black)