This is a complete walk through on my workflow using photoshop CS. I have included a link to a downloadable TIFF file of M45 for the use of this tutorial.
My Link Tree - https://linktr.ee/avastronomy
Links to my other videos that explain layer masks, camera settings, Collimation and image processing in more detail.
https://www.youtube.com/watch?v=W66Okjh4P2g&t=1051s
HLVG - https://www.deepskycolors.com/archive/2010/04/26/hasta-La-Vista-Green.html
Gradient Xterminator - https://www.rc-astro.com/resources/GradientXTerminator/
OPT telescopes and Agena Astro have a tremendous inventory of astrophotography gear and great service. You can check them out here through my affiliate links. This is the setup I currently use.
Agena Astro - https://bit.ly/3D3U8id
ASI AIR PLUS - https://bit.ly/46BTfej
IOPTRON GEM 28 MOUNT - https://bit.ly/3O2QpGX
WILLIAM OPTICS Z61 - https://bit.ly/44v5Hv7
IOPTRON IGUIDER - https://bit.ly/44AXRzv
ASI 294MM CAMERA KIT - https://bit.ly/46Clqd3
Links to helpful astrophotography items that can be purchased directly through Agena Astro.
TELESCOPES
Redcat71 APO telescope - https://bit.ly/3D6cT4s
Sky Watcher 8" Dobsonian reflector telescope - https://bit.ly/3XGYwNy
ASTRONOMY CAMERAS
QHY 600M - https://bit.ly/3rbHgno
ZWO ASI533MC Pro OSC camera - https://bit.ly/3XPlzpx
ZWO ASI2600MC pro camera - https://bit.ly/3pDJFHg
MOUNTS
ZWO AM5 Mount - https://bit.ly/44eHUzn
Sky Watcher Star Adventurer 2i Pro pack - https://bit.ly/44gXXMV
Sky Watcher EQ6 R pro mount - https://bit.ly/3riYbVc
Sky Watcher EQ8 (for heavier payloads) mount - https://bit.ly/3D3UFkd
Celestron CGXL mount - https://bit.ly/3O2u6lQ
FILTERS
Optolong Luminance Pro (broadband light pollution filter) - https://bit.ly/46FIdEJ
Optolong L-extreme(vary tight/narrow dual band light pollution filter) - https://bit.ly/3NLwrjJ
Optolong L Ultimate - https://bit.ly/3NIHABV