When I want to remove the pixelation, there are two techniques I use.
If I am dealing with gradients (as in a photograph), I use the blur tool to blur together places where I know should be the same color, and to make edges less pixelated.
If I am dealing with solid colors, I use the marquee selection tool. HEre Ill show an example of both techniques..

If I am dealing with gradients (as in a photograph), I use the blur tool to blur together places where I know should be the same color, and to make edges less pixelated.
If I am dealing with solid colors, I use the marquee selection tool. HEre Ill show an example of both techniques..

