|
||||||||
CCD ImagingProcessing Your ImagesOnce the image(s) have been taken, processing begins. We recommend that you take dark and flat frames during the CCD imaging session. While it is possible to keep a "library" of these files, we have found that you're better off taking them at the same time as the images. Remember: these two important files are your best defense against noise and other imperfections in your images. You want the best possible; darks and flats from other CCD imaging sessions will just not be as good as the ones you take right then! Color images produced using monochrome CCD cameras involves taking black-and-white images through color filters (red, green and blue; we recommend a fourth: luminescence, or clear7#41;. Once these black-and-white images have been processed, then they are combined to make a color picture. The processing steps for each of the three or four images (taken through each of the color filters) are the same as that applied to monochrome images. And, most of the time, you will make each of the color image components from multiple images taken through each of the color filters and combined the same way as black-and-white images. This also needs to be said: At every step in the CCD imaging process the battle against noise is your biggest job. Noise avoided during the image-taking steps will be noise you won't have to deal with later. We need to talk about the sources of noise and how they can either be avoided or reduced in the CCD imaging process. Noise produced during CCD imaging is affected by the following:
|
||||||||
|
||||||||
