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Hi Moggy,
Process it in Photoshop Gimp, etc, so the image is 20 x 30 inch and 300 dpi.
Then take it on a CD, flash drive, SD card, or whatever you like to any camera shop that deals with Kodak.
Ask them to do a 20 x 30 inch print.
It will have to be sent away and will be back in one or two days.
20 x 30 prints look magic when framed.
I find that it needs several 4Mpxl shots stitched together to get a really good 20 x 30 image. (Up to 6 shots - 2 across to give the 20" and 3 down for the 30")
If you need to size an image up you must do it in small stages.
Just guess each step so it is about a 10% step up. The amount is not critical, it just has to be a small amount.
ie instead of making a single 30% increase, do it by at least 3 stages of about 10% each.
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