Haven't posted a new image in a while and thought this one was particularly interesting not only because it's an interesting galaxy with unusual structure but also because the processing was done almost entirely(95+%) in PI. Just some minor tweaks in PS which I find I use less and less.
First the image which is an interesting unbarred spiral galaxy which is thought to be distorted from it's interaction with NGC 770, the largest of the three small galaxies to the upper right of Arp 78. The spiral arm in the outer region appears disturbed and probably represents a tidally driven structure. What appears to be a faint ? tidal stream is extending upwards towards the brightest of the three small galaxies(PGC 212884). I had 600 mins of Luminance data(some not used in the LRGB image because of higher FWHM values) and I wildly stretched and inverted this image to better show this feature. Here is the LRGB image:http://sleshin.startlogic.com/stargazergallery/main.php?g2_itemId=439&g2_imageViewsIndex=1
And here is the inverted Luminance:http://sleshin.startlogic.com/stargazergallery/main.php?g2_itemId=451&g2_imageViewsIndex=1
In case there is anyone interested and to encourage feedback on the image and the work-flow, here is brief description of the work-flow I used:
1. Bias, Flat, and Dark Masters were created and then light frames were calibrated and registered. L,R,G,and B masters were made using the Linear Fit Rejection algorithm.
2. Created RGB Master with Channel Combine Module.
3. Dynamic Crop RGB and L Masters.
4. Prepared RGB master with DBE, Color Cal, non linear stretch with Histogram and Curves, Increased color sat with lum mask in place, and SCNR.
5. Prepared Lum master with DBE, Deconvolution with mask protecting everything except the galaxy, non linear stretch with Histogram to try to approximate the brightness of the CIE L* component of the RGB. Then ran the Linear Fit Tool to more precisely match the Lum master with the extracted CIE L* component as recently described by Juan.
6. Used these processed L and RGB masters to create the LRGB master using the LRGB combine tool.
The LRGB image was then further processed with:
2. Atrous Wavelets to first smooth the background and then very slightly sharpen the small structures in the galaxy. Appropriate masks were used here.
4. Black point adjustments with Histogram Transform.
Those are the main steps. Feedback and comments always welcome.