On Mar 4, 3:52�pm, wrote:
On Mar 4, 3:43?pm, "Jason Albertson" wrote: I like to print photos of images I've taken during planetary imaging
sessions. ?I have been printing images for several years, but I always have
the same problem: ?I can't seem to see the noise very well until after an
image is printed. ?Many, many times I have wasted initial prints because
noise rears its ugly head in the image. ?Then I have to go back and try to
gaussian blur the image at the risk of loosing sharpness when the image is
reprinted. ?My question is this: ?is there any easy way to see noise in
images before they are printed? ?If I zoom in 200% or better and readjust
brightness/ contrast, this helps somewhat, but I am usually still
disappointed once the image is printed. ?There must be a better way of
seeing/ predicting noise that will show up in photos. ?Any help would be
greatly appreciated.

Thanks in advance,
Jason

* * Some of the soft ware routines, (i.e. Max DL or AIP4WIN?) alow you
to measure the statistics in a specific and controlled region of the
image. *Pick a region of the dark sky and measure the std. dev. *Hope
this helps.

As a specific example consider AIP4WIN. Go to the Measure\pixel tool.
Choose a circle diameter of 60 pixels in the dark sky region. In one
case the mean is 3.77 with a sdt dev of 9.66. This operation is about
as fast as looking at the image.