> COLOR RESTORATION AFTER RAW FILES STACK IN 16 BITS

  • Posted on: 14 February 2019
  • By: tihomiry

If you have used DeepSky stacker to stack RAW files, maybe you have notice that the resulting image is poor of color saturation. This is because it has a higher number of bits then the display could show. Going to less bits per Chanel we are loosing information so it is good idea to do any touches as early as possible. DeepSky stacker give us tool to achieve correct color balance and increase luminosity and saturation. The best color balanced image has all the 3 channel (RGB) histograms overlapped. You can adjust this as well as increase intensity of high lights and shadows (correct the background). Finally use the saturation slider to achieve the colors. But be careful with the color noise.

Below: NGC 7635 Bubble Nebula 06.09.2015. Pentax k-5, 30 frames x 30s. ISO 51200. UHC-S Oxygen III and Hydrogen alpha pass filter. Telescope SW 200pds, F1000mm 1:5. The “bubble” is created by the stellar wind from a massive hot young central star. At the upper left M52 Open Cluster. At the upper right – upcoming cloud

http://www.deepskywatch.com/deep-sky-hunter-atlas.html This is an amazing resource. Detailed atlas of all the sky with NGC and IC objects.

Reading a new product that claims to be 100x time more powerful then conventional telescope, I realise that this is just an astrograph with a digital camera that is doing stacked images and show them trought eyepiece or App.

I am so impressed with the K5 ability to quickly gather signal from nebulas (Quantum efficiency) and galaxies, so I decide to take one more K5 and to remove the IR-cut Filter of the old one.

Recently I got one very good lens the Asahi Takumar 135mm 1:2.5. This is fast telephoto lens and from my point of view a good lens should be with aperture from 1:1,2 to 1:2,8.

Moon at 45% illumination and 70x magnification. With aperture of 200mm,14,1 stops dynamic range, color depth of 23.7 bits at this image there are slight color variation on the moon surface that reveals it’s structure.

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