I took 5 x 5 min each of LRGB & Ha on M33 centered around 3am on Thursday morning. These were taken with my SBIG 2000 and Baader filters on my William Optics 132 FLT.
For this image I calibrated, combined and aligned the images using AstroImageJ. Then I used Fits Liberator for the initial stretch and save to tiff, followed by RGB stretching and combination with Photoshop. For this version, I did not use my L or Ha frames. Then I opened the file in Nebulosity and did a bit more processing, 2x2 adaptive binning and saved as a jpg.
I intend to work on another version using the L & Ha frames.
Willie