Need help with pixel information

Being new to digital photography, I am having some trouble understand the
relationship of camera pixels to the PPI of video screens, printers and
internet publications.

On a recent photo outing, I took several photos of different subject matter
without changing the camera settings only to discover that the file size varied
all over the place. I didn’t understand this.

Could some please suggest the name of a good technicial book that covers this
subject matter in detail.


Thank you very much for your time and courtesy.

Gene

"GENEVIG" wrote in message
...
Being new to digital photography, I am having some trouble understand the
relationship of camera pixels to the PPI of video screens, printers and
internet publications.

On a recent photo outing, I took several photos of different subject
matter
without changing the camera settings only to discover that the file size
varied
all over the place. I didn't understand this.

Could some please suggest the name of a good technicial book that covers
this
subject matter in detail.


Thank you very much for your time and courtesy.

Gene

Your camera compressed the pixels on the imager and made it into a jpeg
(.jpg) file. The size of the file is large if the image is complex and very
small if simple, like a white or black wall. Although lossy, with some
detail lost, it needs to do the compression to get three to five times more
images onto your flash card.