Dynamic range of digital and film: new data

wrote:
In message ,
"Roger N. Clark (change username to rnclark)"
wrote:


You might take a look at the image processing program ImagesPlus
( http://www.mlunsold.com/ ) It works in true 16 bit, adds images
together, and can register them before adding. It also has a
lot of interesting filters and is widely used in the astronomy
community. (I have no affiliation or monetary interest with mlunsold.com).
It is what I use for all my camera statistics.
Astronomers commonly add dozens to hundreds of images together
to increase signal to noise. For example, see:
http://clarkvision.com/astro/saturn.03.02.2004
I added 99 frames of Saturn together, taken with a telephoto
lens and applied filters to increase spatial resolution.


I downloaded the demo, but the demo seemed to be restricted from doing
anything I was interested in trying, IIRC.

Does its stacking feature automatically rotate and offset individual
images, and does it use sub-pixel placement, outputting a higher-res
image?

I'm not sure about the sub-pixel placement. You could
always enlarge the image first (it does have batch
resize abilities, which is qhat I do). Send Mike (the author
of the prog) an email. He is usually pretty good about responding.
He adds features based on user requests too. I have done
planet registration as well as astrophoto shift and rotate
registration of star fields. You select one or two
areas for it to match to and it does some sort of autocorrelation
to do the alignment. It can also grade the quality of
multiple images and add them in a weighted average.

Roger

wrote:
In message ,
"Roger N. Clark (change username to rnclark)"
wrote:


You might take a look at the image processing program ImagesPlus
( http://www.mlunsold.com/ ) It works in true 16 bit, adds images
together, and can register them before adding. It also has a
lot of interesting filters and is widely used in the astronomy
community. (I have no affiliation or monetary interest with mlunsold.com).
It is what I use for all my camera statistics.
Astronomers commonly add dozens to hundreds of images together
to increase signal to noise. For example, see:
http://clarkvision.com/astro/saturn.03.02.2004
I added 99 frames of Saturn together, taken with a telephoto
lens and applied filters to increase spatial resolution.


I downloaded the demo, but the demo seemed to be restricted from doing
anything I was interested in trying, IIRC.

Does its stacking feature automatically rotate and offset individual
images, and does it use sub-pixel placement, outputting a higher-res
image?

I'm not sure about the sub-pixel placement. You could
always enlarge the image first (it does have batch
resize abilities, which is qhat I do). Send Mike (the author
of the prog) an email. He is usually pretty good about responding.
He adds features based on user requests too. I have done
planet registration as well as astrophoto shift and rotate
registration of star fields. You select one or two
areas for it to match to and it does some sort of autocorrelation
to do the alignment. It can also grade the quality of
multiple images and add them in a weighted average.

Roger