RGB horizontal stripes

[brujo]

I am capturing LRGB with QHY174M Cooled camera.
Stacking Luminance files looks good, but
after stacking RGB images I notice some horizontal stripes.

[einari]

Are you dithering ?
If not then you should.

There are ways to smooth those stripes but better to use dithering.

[fabdev]

Also: are using an average of 8 or more dark frames? That is camera noise, there are still some hot pixels.

[brujo]

Yes I am dithering, after the green filter I have switched it on the red filted, but same results.
Using PHD2.
Also have about 30 dark frames.
Maybe it's just that "colored" images needs more files.
In this case I have made 60 images of 60 seconds (well it is one hour..!).
It's strange because with luminance filter it looks so much better.

[einari]

This might be useful read:
https://www.cloudynights.com/topic/5925 ... mc-cooled/

[fabdev]

The luminance has a dark border on top, this means that dithering was working and there is some shift between the images.
The green image has not the border. Maybe dithering was disabled? Verify that there is some shift in the green sequence.

Verify also that the dark frame are updated (taken in the last weeks, at the same temperature).

[brujo]

Have repeated once again.
Luminance without dither and Green with dither.
And the problem remains.
I'm confused..
After making a new set of green frames i see that the solution is to make a lot more coloured images than luminance.
2 hours of green images are looking better