On the other hand, I don't know anything about the algorithm that's
used in a digital zoom situation. I assumed that they simply used an
internal crop. That may not be the case, but if it is, my statement
applies. As I understand it, a crop in photoshop simply throws away
the pixel information outside the crop. I assumed that a digital
zoom does the same thing.
Roger,
No intent to challenge at all, I just wanted to make sure we are all
talking about same apples and same oranges.
As for adding more variables, I agree it's not the best idea, but
multiple variables do play a role in this analysis.
Your comparison of "digital zoom" and "crop" in PhotoShop is indeed
correct, however (and without sounding challenging) it is not the same
as the 1.3/1.6 "crop" term used in conjunction with the Canon DSLR
line-up (or the 1.5 crop factor in the Nikon DSLR) which is definitely
NOT "digital zoom", the 1.3/1.6 crop is a result when a
smaller-than-35mm format digital sensor is used with the full-frame
35mm format lenses where only the smaller center portion of the full
image is being picked up by the sensor, creating an equivalent
magnification effect.
Maybe the manufacturers should be using the term "multiplication" or
"magnification" rather than "crop"?
Cheers
Ken
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