Greetings,
I recently discovered Blender looking for a way to composite two image sequences. My background image is transparent except at the center, and the foreground images have particles with transparency flying off. When using alpha-over to composite the particles are blurred. When using mix to composite the particles are less blurred but nothing over the transparent part of the background shows in the rendered output.
As you can see I am a newbie – thanks for any suggestions.
Hello and welcome to blender artists !
Ok, if you’re still having the issue if you can port an image of the result you’re getting , maybe that would be simpler to find something.
Alpha over should work, and that doesn’t add blur that isn’t there. Do a test in an application like photshop / krita, to inspect your images , you should get something similar in blender , obviously !
Good luck !
Welcome 
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…and you know about the “problem” of straigh tand premulitplied and the settings to use… ?