2007-01-15 13:58:31 · 4 answers · asked by wubus 2 in Consumer Electronics ➔ Cameras
If you are simply looking at a print, I'd say it is not possible. If you can do this, you're a better man than I.
There are so many factors that go into making a print; so many decisions that can be made to affect the outcome, that I'd say you just can't tell.
You can tell if it's been printed high or low resolution and guess the dots per inch, maybe, but you would not know if it was a full frame print or a really tight crop of a huge image just by looking at the print.
I'll read the other answers to see if I can learn something here.
Good question.
2007-01-15 14:06:41 · answer #1 · answered by Jess 5 · 1⤊ 0⤋
Blow the picture up to double size. Double it again. Compare resolution of all pictures. If there's a drastic change, the megapixel is relatively low, If the resolution change is minor, then your megapixels are high.
2007-01-15 22:48:54 · answer #2 · answered by Del C 3 · 0⤊ 1⤋
If it has not been changed in size, IT's simply teh height times the width in pixels. Mega-pixels aren't nothign special.
I have a Canon S3 IS that in highest resolution is 2816 * 2112 =
5,947,392 = 6 Mega-pixels.. well actually a touch under 6:)
However if the picture has been cropped, well.. then it's no longer 6 mega-pixels now, is it?
However, Mega-pixels is only the *number* of *pixels* in the image.
Making a camera's image look good at 6 mega-pixels or 12 mega-pixels is another question :)
2007-01-15 22:14:39 · answer #3 · answered by magu2k 3 · 0⤊ 1⤋
I belive it is x amount of megapixel's per square inch so if you have a good magnifing glass go for it!
2007-01-15 22:08:06 · answer #4 · answered by tmerring1964 2 · 0⤊ 0⤋