19 June 2021: Our upload server https://upload.astropixelprocessor.com/ has been migrated successfully to our new office with higher upload and download speeds (nearly 10MByte/sec up/down ) ! We now have 1 general upload user called: upload with password: upload. The users upload1 - upload5 have been disabled.
31 May 2021: APP 1.083-beta2 has been released ! APP 1.083 stable will follow soon afterwards. It includes a completely new Star Reducer Tool, New File Saver Module, Improved Comet registration and much more, check the release notes here!
Canon Banding Reduction
Would it be possible to add a Canon Banding Reduction option ?
Do you see it remaining an issue in a stack? I think it should already be a signal in the bias or darks, might be mistaken.. Dithering will also reduce this.
Yes, the banding is visible in the stack (see attached (extremely stretched) photos).
You are right to say it should be gone with darks.
However, since I use dithering and Bad Pixel Map, I found that I can process my photos with only Biases and Flats (as per option 1 in sticky post "Data calibration principles/rules") and achieve nearly the same result as with darks once the remaining banding is removed from the stack.
For this I use the process integrated in other processing softwares but it would be nice to have this function directly into APP.
edit: Maybe the banding reduction would be even more effective if applied on each sub, during calibration ?
Yes that would work better, but it’s not going to improve the data dramatically I think. It will reduce it of course, but I think you still get a better result in this case by using darks as well. That will be the actual data and not “guessed” by an algorithm.
In fact, it seems that this problem cannot be entirely solved with darks as the banding is not constant from one image to another.
There was a Yahoo group on this subject but those groups are now dead.
I did a test adding darks and here is the result.
Even though the problem has diminished, we can see that there are still bands.
I requested this feature because it is present in other programs and I thought it was a classic.
Unfortunately, this problem only affects Canon cameras (old ones ?) and only a few of them, I may be the only one who needs this feature.