Originally Posted by Jon Ruyle
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Yeah, you are right. I have to fix the blown highlights. As for the blacks, I just like them that way. I know some people don't, but don't like seeing a greyish background.
You can adjust the shadows so the sky is still dark without over clipping. And provided you got enough image data in the first place you will leave faint subtle details intact.
Don't I need DPP to convert the .cr2 to .tiff? DSS won't work with .cr2 files, will it? And I like to do some 16 bit processing before going to gimp. Gimp only handles 8 bit files.
DSS works fine with CR2 files. It did have some problems with RAW Files from the T1i and T2i cameras, but last I heard that has since been fixed.
I haven't used gimp in a while, but I thought that it did allow you to load 16 bit tif files and do some editing at 16 bits now. Might be wrong.
Ahem. No. Not this time. The AP really doesn't require flats. This weekend I'm going out again, and I'll take some shots with the Edge HD, and I'll try doing it right (or at least, a little more right) [img]/emoticons/emotion-1.gif[/img]
Flat field calibration isn't only to correct optical errors/artifacts or uneven filed illumination that might be caused by a telescope or lens system. What About your camera? Flats are also used to correct for variations in the sensors pixel to pixel response, or artifacts on the sensor such as dust motes.
http://www.cyanogen.com/help/maximdl...alibration.htm
http://en.wikipedia.org/wiki/Flat-field_correction
When stacking with DSS or any astroimage stacking software you really should use Darks, Bias, Flats and Dark Flats for a properly calibrated and stacked image. The quantity of each depends greatly on the SNR of all your Light Frames. But it is often otherwise recommended to use a 1:1 ratio for each.
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