My image looks pixilated and blur, how do I increase its quality?
Go to Menu Bar: Image > Image size > change the resolution. The higher it is, the better. However in some cases when you are working with specific dimensions, eg a banner for your blog like 728 px X 90 px, there’s only so many pixels in it (do the math! 728 X 90 pixels is..?), and the resolution cannot get any better or bigger than that, so you can expect a lower quality but smaller size (loads faster for web viewing).
A rule of thumb is always remember that you can always downsize an image and keep its quality, but you can never increase the image size along with the quality, so always keep a spare high resolution copy of your image around!
you can also check Overview Video Cost