Cosmetic Correction

[orion10051976]

dear all,
i was wondering if CosmeticCorrection process is useful if i used dithering during capture (each single frame).
i tried to use it and by tweaking sliders of hot and cold sigma i do not notice any change unless i reach a very low value for hot sigma
thank you very much

[jshortt]

I think it really depends on your camera. It's really good at repairing defective columns (hot or cold) and to me that's its biggest benefit. Dithering doesn't completely resolve these issues and in my experience creates a faded "trough" in the image after alignment and stacking.

The stats under "Real Time Preview" will tell you how many pixels are being affected.

John

[orion10051976]

Dear John,
thank you for your prompt reply.
actually i use a DSLR and i don't have columns or rows damaged.
i completere the whole process with CC and without CC,
the result with CC process is not good at all (maybe i cut too much). i'm sorry but i deleted it (all frames) and i cannot post an image.
i checked with real time preview and i noticed that no pixel is touched unless hot and cold values are very low.
maybe i already had goof frames due to dithering and a large number of dark frames (20 dark and 12 lights)?

thank you and sorry for my bad english

Rino

[pfile]

dithering will not affect the subframes at all. if you have hot pixels they appear at the same coordinates of each frame. after registration, those hot pixels get moved around and then when you stack, they do not lie on top of each other. therefore they can be rejected more easily during stacking. but the dithering will not change anything about how cosmetic correction handles each exposure.

rob

[orion10051976]

THank you very much Rob.

Rino