I've been examining methods to make a CR2 file I have into a large JPG file. The CR2 file dimensions that I can see are approximately 5k x 3k pixels, but I would like it to be saved as a JPG file that is much larger like 10k pixels x 10k pixels because I want to use it for large format printing. I don't want to increase the resolution either. Is there any way I can achieve this?
Just to be clear:
You don't need more pixels just because it's printed large! That's a very common misunderstanding.
Any good quality file from a current camera will work for anything, whether magazine spread or roadside billboard.
5000 x 3000 pixels is not a huge file, but it should still be more than enough for most practical purposes. It's vastly more important that the image is of good technical quality - sharply in focus, no motion blur or camera shake, and optimally sharpened for the intended use.
The bigger the print, the farther away it will be seen from. The eye wants to take in the whole image, so you step back. You can't help it. So the effective, optical resolution stays the same:
Don't upsample jpegs. Ever. The compression artifacts look horrible when upsampled, no matter the method.
Yes, super resolution is probably the best of any available method, in the rare cases where it's justified. But it's not magic. It doesn't improve anything, it just cuts the losses to a minimum.
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