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The images below show the results of unsharp masking applied to the original image. On the left the original image is shown with, in general, an over-illuminated central part. Applying an unsharp masking algorithm (consisting of subtracting a smoothed image from the original) yields the image on the right. |
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All images: CCD: FT800 CCD in prime focus Scope: 25cm f/D=5.8 Newton Date: May 1998 Illum.: M63 sum of 11 images of 90 seconds M94 sum of 9 images of 60 seconds M106 sum of 11 images of 90 seconds |
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