StarTools

The brighter members form a "stubby dipper", and give the cluster a boxy appearance. Eight 9th- to 10th-magnitude stars form the main group, and a few more stars of similar brightness lie isolated to the east. Two pairs of 9th- to 10th-magnitude stars are situated 10' west and 10' south of the cluster.

M 29 CEA CYGNUS
10X15 45º M100 HP 38 S4-2
TSOPTICS+INFINITY+IRUV

Work flow= Autodev/ Wipe+gradients/Dev/Color-Scientific +Dark Sat máx./Denoise+Star mask inverted/Life+Moderate+Starmask/Dev+Digital develop+0,01

You have great star colours. More data I think would help with the noise, you could try adding bin into your workflow at the start.

Thank you very much for commenting

I do not understand the function of Bin very well, the photos of my camera are in relatively low resolution of 1,5 Mp. I understand that the Bin reduces this resolution but when I try it to Bin 50% I do not see any difference in the image.

I adjust the color by making a star mask adjusted and clicking on the Sample option. I choose the option to saturate dark to the maximum and Artistic, detail aware + RGB ratio-Ciel ab luminance retention.

Bin just helps when you do not have lots of data to combat noise.
I am unfamiliar with the setup you might have added to your post to have known the size/pixels of your source data.

Star masks I find the auto mask then followed with a shrink grow grow can work OK. If the mask is not quite right for the situation in hand I find star halos can begin to show.

Thanks again

My camera setup is the ATIK Infinity for this picture:

Sensor size= 9x6,5
Pixel size= 6,45
Resolution=1,5 Mp

Sensor has a low noise, I Think..

Good advise on star-mask, thanks