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| Bob Walker | profile | all galleries >> Picture Window Pro Tutorials >> Removing Hot Pixels >> Making a Hot Pixel Mask | tree view | thumbnails | slideshow |
This gallery shows how to use Picture Window Pro to create a mask of the hot pixels on your digital camera.
In its simplest form, it is a 3-step operation. (1) We take a dark frame (the image below called "OpenDark.jpg", the first image), (2) threshold it in HSV space ("DFThresh.jpg", the ninth image), and (3) extract the HSV channel ("Extract.jpg", the 13th image).
In the more thorough form, we take additional care to minimize noise components in the dark frame image before we threshold it.
 Open Dark Frame Image |
 Dark Frame Image |
 Stack Images Transform |
 Averaged Dark Frame Result |
 Median Blur Transform |
 Twice-Blurred Dark Frame |
 Absolute Difference Transform |
 Dark Frame Result |
 Thresholding the First Dark Frame |
 Thresholding the Noise-reduced Dark Frame |
 Thresholding Comparison |
 Thresholded Image Result |
 HSV-V Extract Transform |
 Hot Pixel Mask |
 Feathering the Mask |
 Aggressive Hot Pixel Mask |
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