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Old 17-04-2021, 02:34 PM
ChrisD
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ChrisD is offline
 
Join Date: Apr 2021
Location: Melbourne
Posts: 23
How to stretch OSC images without losing colour (pixinsight)

I recently posted an image on Images > Deep Space.

https://www.iceinspace.com.au/forum/...61&postcount=1

There were some comments about the quality of the colour of the image, especially since it was from a OSC camera. I thought I might pass on something I used to improve the colours.

I don't know how widely this is know, but I've found that the Histogram Transformation function is stretching the luminance values but not the colour so much. The ArcsinhStretch function worked way better with RGB values during the stretch.

In the image below the same image was stretched with the HistogramTransformation function on the left and ArcsinhStretch on the right. You can see the difference.

If you want to maintain colour in an RGB stretch, I would definitely recommend using ArchsinhStretch.

I hope someone finds this handy.

Chris
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