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Next Stargazing Feb 18th
Next Stargazing Feb 18th

Tutorials

  • Image Processing Basics

    Image Processing Basics

    So, you have taken your first CCD images and they look pretty good, but you are ready to improve them. Image processing allows you to enhance CCD images using a wide variety of algorithms. However, keep in mind that image...

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  • Image Calibration

    Image Calibration

    Below are the basic steps involved in CCD image calibration. For step-by-step instructions with specific software packages, see the Software Instructions section. Getting Started The first thing that must be done to a raw CCD image is calibration. This is...

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  • Image Display

    Image Display

    The most basic processing step after image calibration is simply altering the way in which the image is displayed so it looks best on your computer screen. Computer screens are limited to displaying 256 shades of grey. This is all...

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  • Image Processing Filters

    Image Processing Filters

    A filter is an image processing routine applied to an image to enhance details. This is usually done in one of two ways: by smoothing the image to remove noise and show subtle features hidden by the noise, or by...

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  • Color Imaging

    Color Imaging

    Most astronomical CCD cameras create color images by combining black and white images taken through red, green, and blue filters. In theBasics of Taking CCD Images section we gave the example of the Trifid Nebula, M20, imaged using this technique....

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