how do you compress an image?

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Compress an image into what? From what initial type to what compressed type? Do you mean BMP to JPG, or what? A little more info would be needed in order to give a more precise and informative answer, as there are numerous image types...

Like the quality of the image. If you have photoshop, before you save an image, you can select the 'quality' which reduces size or increases size.

That better?