Quoted Text
You seem to be quite knowlegable about photography! Did you deduce the technical properties you mentioned by simply observing the picture, or is this information encrypted in the file and retreivable somehow?
Pieter, as with everything in life I am constantly learning.

My wife has taken numerous photo courses and is an advanced "amateur" photographer and passes her knowledge on to me. While one can deduce certain aspects of a photo from it's appearance the reality is that
most digital images that are not manipulated to too great an extreme will contain embedded shooting data in the file. This data is necessary in cases where a picture needs to be edited and enhanced. Many modern photo software programmes allow for the reading of this data (iPhoto, Aperture, Photoshop etc). Information about image and file size, camera type and varied exposure information are common to most digital camera pictures. Some camera's even give you the GPS co-ordinates of where the picture was taken (some cell phone cameras as well as very high end cameras). Hope this helps.
Cheers,
Jan