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Originally Posted by [1ponders]
I had a quick look at your original in PS particularly the histogram. You image has severly clipped white and black points. The first histogram below is yours and the second is roughly what you should be trying to achieve, initially anyway, in your processing. If your image is arriving at PS clipped then you need to make some sort of adjustment in possibly exposure, gain, etc.
Then check your histogram in Autostar and see if it's clipping. If it's fine then save your images as FITS files (I can't remember if AS will save as Tiff) rather than bmps. At least that way you'll keep your image as 16 bit rather than having it converted to 8 bit when saved as a bmp. If you save as a bmp in Autostar Suite you don't have any control over how the 16 bit is converted to 8 bit and valuable information can be lost. (as is seen in your histogram)
There is a FITS to TIFF conversion on the net somewhere (I think Eddie T did one. Check his site http://www.astroshed.com/software.html) as well
Nasa has a FITS plugin for PS I think. |
thanks for your informed post paul. thats weird as i normally save my pics in .tiff format but haven't try fits.