What do you use to create drawable resources? (Best practice)
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I have a number of PNG images which I convert to different resolutions using a base script that I wrote.

The input is an image and output is a number of scaled images with resolutions that match: drawable-xhdpi, drawable-hdpi, drawable-mdpi, drawable-ldpi.

Is there a better way of scaling icons and PNG images? What do you use? Should I be using SVG images instead?
