Our companie's software product in effect does this and users hate it. The problem is a 800 x 1000 pixel graphic looks good on screen but on paper in looks blocky and pixelated. On an 8x10 inch page this means 2400x3000 pixels. An 800 x 1000 screen dump scaled to fill the page has an efecive resolution of only 100 DPI and looks poor, either jaggy or if anti-aliasing was performed then blurry. Much better if your plotting package can create images of any size.
Postscript is best but a big raster image is OK only slower and bigger.