Quote:
Originally Posted by rogerg
I have new green data and have been trying to make something of it.
Your level of wizardry with PixInsight is an order of magnitude higher than mine. I'm wondering, with our Background Neutralisation and Colour Calibration, howdo you select a ROI being that of the galaxy ... Given I have one image file open which is the DBE modified LRGB combined image, do I select that same image for the white and background reference? I'm doing this but not seeing any change in my image ... just a bit confused about how to use the tools  |
Roger: to use the galaxy as a white reference you draw a preview which includes the galaxy, or a representative slice of it, and as little background as possible. Use that preview as the white reference in the ColorCalibration dialog. Similarly, you can use a preview of a background area of the image as the background reference.
Quote:
Originally Posted by rogerg
And second question ... Saturation Boost - what tool do I use for saturation? I can't find a process for it |
The easiest way to boost saturation is with the CurvesTransformation process. Just select the "S" curve and play with it.
You won't want to boost the saturation of the faint areas since this will make chrominance noise and faint colour gradients more visible. A technique that works well is to extract the CIE L* (Lightness) component of your image and use it as a mask:
- use the menu Image>Extract>Lightness (there's a button you can click as a shortcut) to extract the L* component as a new image which will be your Lightness mask
- use HistogramTransformation to stretch the mask and clip the black point to protect the background
- apply this image as a mask to the original
- now apply the saturation boost (real time preview is useful to get the amount of boost right)
- remove the mask unless you want to use it for whatever you're doing next
Let me know if you have any problems. Good luck with the new data.
Cheers,
Rick.