Risking violation of any unwritten rule about imaging the same target twice in the same season, I offer another treatment of M33, The Triangulum Galaxy. I did some additional research on M33 since last time and wish to record a bit of it here. Additionally, this LRGB image is a combination of 30s and 300s frames in all channels using PixInsight's (PI's) HDRCombination (HDRC) process. I have come to like this process, however I am now eager to compare it with a more straightforward process of using single exposure time frames for each channel, but using something in between 30 and 300s.

M33 tends to come out colored in blue, and in fact this time mine came out more purple. I tried to fight that with several color balance attempts, but in the end this is the more "natural" coloring from my data using PI's PhotometricColorCombination (PCC) process. It was just easier in the end to leave it as is. One of the consequences is that some of the little regions of interest inside M33 came out very blue in color, and in fact I discovered this is quite common and considered more or less "natural". Interestingly, my earlier version was bluer and less purple.

The annotated revision (F) shows several nebular regions within M33 including NGC588 on the center right and IC132 on the upper side of the galaxy. These are both quite blue in color and appear to also be very blue in more detailed images online. They are diffuse nebulae regions, but I was unable to learn more about them than that at this time.

Using HDRC to combine short and long exposure frames did a good job presenting the stars less saturated and bringing out fainter detail, however I think this would likely have been done with suitable number of frames with exposure in between. I put together a quick LRGB combination of just the 30s frames and was pleased with how nice it looked without including the 300s frames. This also had the pleasing result of not showing as much difficult variation in the background.

I have a direct and recent comparison with my recent version where I used 240s frames for L and 120s for RGB. Of the two methods, I think I actually like the earlier, although shorter L frames would have been better.

I hope you enjoy my repeat of M33 and forgive me the monotony. Soon I hope to have my C11 back up and running again, and I wish to return to smaller FOV's.