when stacking frames in DSS, i am not sure how to select good frames or discart bad ones.
Say for instance that during the image session some clouds crossed the area I am imaging...
what parameters I should check in DSS to select the frames? As sometimes I end up with
images with a lot of gradient, even though some individual frames are OK.
Since when I load the files in DSS they all look quite plain... how do I discart bad ones?
By no means an expert in DSS but here are some of the things I've found helpful.
Adjust the image slider at top right to best show the details (you probably already do this):
dragtheslider.jpg (14.87 KiB) Viewed 3747 times
It may also be helpful to move the end stops to increase contrast (neither of these affect the final image but they may make judging individual subs easier):
move the end stops.jpg (13.87 KiB) Viewed 3747 times
Then use the columns. Clicking in the column title will order the files either highest first or lowest first. I usually start with the score, and have a look at deleting or removing from the list any that are much lower than the others. Also have a look at FWHM, no of stars and Sky background. A rising sky background coupled with falling numbers of stars may indicate cloud (or dew) whereas big FWHM might show a guiding problem. Again organising the sub by score and having a look at the worst ones with a view to removing them can help improve the final stack.
columns.jpg (85.07 KiB) Viewed 3747 times
Skywatcher 190MN, ASI 2600 or astro modded Canon 700d, guided by OAG, ASI120, PHD2
I did use the sliders, but didn't see any difference in images, and the "Score tab" too but even selecting the best ones it comes out "wrong" sometimes
I didn't know how to interpret the FWM and sky background values, thanks a lot for the tip! I will try it right away! ^^
If you high light the highest score and right click , set as reference frame also you will see a settings box before stacking you can set best percentage use this to suit say best 80% or whatever suits you .
