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When rejection is good, part 1

Adam Block shows how you can improve your images by rejecting spurious values, such as those from cosmic-ray strikes.
RELATED TOPICS: ASTROIMAGING
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The genesis for this column comes from my experience with image processing. When I began digital photography in the early 1990s, most amateurs would take pictures totaling a few minutes of exposure and add them together. These grayscale images far exceeded what could be accomplished with film in the same period of time.

More experienced imagers combined RGB-filtered images. However, the exposure times and number of frames collected remained small. Interestingly, imagers often would buy larger instruments and more sensitive cameras before increasing the exposure duration and number.

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