You'll probably need to use an image editing application like photoshop, jasc paintshop pro, microsoft image composer, etc... my digital camera came with its own image editing software, it's called camedia. All of these programs allow you to modify the image size based on either a percentage or pixel count basis. Hardest part is getting the software, the rest is easy.
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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA
http://www.ixpres.com/vlusardi/chevtrk.htm
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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA
72 Stepside Project