Cold pixels
Example of a sum rendered image which is strongly affected by cold pixels.
Cold pixels are produced by individual sensors in the CCD or CMOS camera with lower than normal sensitivity (even as low as zero, a 'dead' pixel). They appear as abnormally dark pixels in otherwise bright areas of an image. Cold pixels may appear at the same position in every z-slice of a 3D stack, in every time frame, and in multiple channels.
Huygens Essential and Professional have a Hot & Cold Pixel Remover, which is a tool that can automatically detect, visualise, and correct cold pixels.
See also
- Huygens Hot & Cold Pixel Remover