One of the main ways that you can check if an image has a transparent backround is through the program "Gimp."
- Use an erraser to rub out the image
If the image you erase leaves a white trail behind it, it is not transparent. However if you come across a checkard board effect, than it has a transperant background.
- Select colour picker and click on image
With this you can see all the (RGBA) values
To add an alpha channel
Rightclick/layer/transperancy and Add Alpha Channel
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