But when I scale that image it loses its quality..
How can I scale image without losing its quality?
The steps which I performed are
The simple answer is that you can't..
The image, when scaled, is interpolated. If the source image is of low quality (as in this video snapshot) the result will be at best equal, but never better without some complex processing.
In this case the video snapshot is heavily compressed so you get a blocky image (a result of MPEG compression) which is not so apparent at the original size but becomes evident when scaled (you just see the artifacts better as they too are scaled).
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