Real vs false resolution

MH
Posted By
Mariana_Henao
Mar 25, 2009
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305
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5
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Closed
It is possible to determine the image original resolution before resampling was applied?

It is some kind of metafile info that could be checked?
(Or any standard relationship between size in pixels and reso that could afford information?)

Thanks.

M.
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R
Ram
Mar 25, 2009
Only if the person who created the file chose to include the History in metadata. Highly unlikely in the case of a re-sampled file they may want to pass off as the original.

A trained eye can very often tell just by looking at the image.
MH
Mariana_Henao
Mar 27, 2009
Thanks.

I remembered just have read in D. Blatners’ Real World Photoshop something about this but have not the book for now.
NK
Neil_Keller
Mar 27, 2009
But in a heavily manipulated image, it might be difficult to say.

Neil
B
Buko
Mar 27, 2009
uprezzing a digital capture is much easier to do and less noticeable than uprezzing a film or print scan.
ZB
Zeno_Bokor
Mar 27, 2009
One sign that the image has been tampered with is if the histogram is full of spikes but it’s not 100% because if the image was manipulated in 16bit or 32bit mode and then converted back to 8bit the histogram will look smooth.

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