JimH123 wrote:
I have been playing with some software to process astrophotography images and find that using RAW files produces images with a lot more detail. But, Nebulosity is a niche type product, and the demosaicing process it tuned for detail, and not for color accuracy. And the color accuracy is actually horrendous with the image being skewed heavily towards green since there 2 green pixels for every 1 red and 1 blue and apparently, it doesn't do anything with that information. But the results are really detailed, and the difference is the demosaicing algorithm being used.
I will go through an example. First image is the original. I used Lightroom to convert the RAW to JPEG and am posting the JPEG without additional processing.
Second image is the nebulosity output, use the same RAW file as input. The output is very green, but it doesn't matter for what I'm going to do.
Third image is the processed image where the resolution of the Nebulosity file has been transferred to the color image using Hi Pass. And here is how it was processed. Both the original RAW and a Nebulosity TIFF file where loaded into Photoshop. For the RAW, lens correction is turned off. I then caused the 2 images to be loaded as layers with the Nebulosity image on top. Then did an auto align. Next, selected only the top image and set it to "Soft Light". Then went to Filters/Others/ and selected Hi Pass. Set the radius to 3.0. When done, flattened the image and saved it.
The last image is a side by side with the processed image on the left and original on the right. It is a heavy crop showing a small region of the image. The original at this crop level seems a bit smeared whereas the processed file still shows detail.
I have been playing with some software to process ... (
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All I see is increased contrast. You can't add detail that was not there to begin with.