How to convert a jpeg from 75 dpi to 250-600 dpi Focused?

Question: How to convert a jpeg from 75 dpi to 250-600 dpi Focused!?

I can email attach this thumbnail jpeg!.
I have a 75 dpi jpeg thumbnail picture I would like to upgrade to a 250 - 600 dpi with clear resolution!. Can you refer me to someone who can help me do this!? How do I do this!? I can email attach this thumbnail jpeg!. I would need your email address to do so!. Thx!. !!!!!Www@QuestionHome@Com

Best Answer - Chosen by Asker:

Sorry!. Forget it!. It won't work!.

Well, actually, you COULD do it !.!.!. but it wouldn't matter!.

Yeah, there are software programs around that claim it can be done!. And some of them do work well in some circumstances!.

But 72 to 250!? With "clear resolution"!? No way!Www@QuestionHome@Com

If any little 75 dpi photo could be made into a large, perfect photo, then we would all be using 1 megapixel cameras and enlarging everything later instead of spending thousands of dollars on high resolution cameras for quality photos!.

Yes, the photo can be enlarged, but it will look HORRIBLE!.

steveWww@QuestionHome@Com

You cannot get printable sizes from a thumbnail theres not enough data!. The 'upgrade' to 250 - 600ppi will make it smaller not bigger!.

Dpi refers to the printer resolution and has no bearing at all on the printed size!.

ChrisWww@QuestionHome@Com

I don't believe you'll get a satisfactory solution on this!. You are trying to bump up the dpi 300% and expect no artifacts!?Www@QuestionHome@Com