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Forum: Pentax K-1 10-15-2018, 10:29 AM  
K-1ii white dot issue ?
Posted By interested_observer
Replies: 18
Views: 1,505
I have seen a couple of references to RawTherapee raw processing being one of the best for astro images. I have not read anything on its ability to clean up the white dots on the K1's images though. This would be an additional approach. I currently have the C1 30 day trial, and it does an excellent job - but I like the LR processing better (color rendering) - which is probably not having enough experience with C1. I just ran across this post on the topic today...Overall, LENR fixes the problem, but I would really would rather not double my exposure time on each frame. Taking a dark frame is an option and I'm now doing that as the last frame I take for the evening. The perfect solution is not having to deal with the problem - but at what cost in terms of in camera processing (possibly a repeat of the Sony star eater issues). I'm guessing that Pentax somewhat knew about the problem and just decided that LENR is the solution and let it slide.

I do wish that Adobe would figure out what C1 does and implement a similar approach (processing option). Having the possibly of Raw Tharapee cleaning the dots would be nice, especially since the price meets with the Chancellor of the Exchequer's approval (my wife).

:cool:
Forum: Pentax K-1 10-14-2018, 06:29 PM  
K-1ii white dot issue ?
Posted By interested_observer
Replies: 18
Views: 1,505
Forum: Pentax K-1 10-14-2018, 02:35 AM  
K-1ii white dot issue ?
Posted By interested_observer
Replies: 18
Views: 1,505
I have only found 2 3 approaches around the white dot issue with my original K1. I've experienced white dots with exposures of 50 sec, ISO 800 @ f2.8 using the astrotracer.
  • Using the in-camera Long Exposure Noise Reduction (LENR) setting - which is essentially dark frame subtraction. This doubles your long exposure with the camera taking a second dark frame to subtract from the first. Or you can take a dark frame manually and in post processing subtract it off (PhotoShop).

  • Use Camera One (C1) for post processing with out using a dark frame. This raw processing utility removes the white dots automagically upon loading the image. I don't know of RAW Tharpee is able to also do this, but LightRoom is not able to remove them.

____ updated_____
  • Raw Tharapee (free download) - does a great job in terms of getting rid of the white dot noise - via their impulse noise reduction.


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