Quote:
Originally Posted by Tulloch
You should be capturing your colour videos in non-debayered format, this is how (nearly) everyone else does it. In fact, Firecapture actively warns you against transferring debayered videos as the transfer rates are reduced and filesize is 3x larger, as you say.
Autostakkert has a unique "drizzle" debayering algorithm which will fill in the colour pixels without using a lossy algorithm as most other programs do. This technique is much preferred over using an algorithm in the capture software and transferring more data than required.
While the ASI178 does have a larger sensor with more pixels, you could also be recording a smaller FOV, Firecapture has a "cut-out" box which you can draw around the planet and it will only record the smaller cutout section. For instance, when I capture Jupiter I usually record a 400x400 pixel box at 150 fps for 3 minutes in raw8 (undebayered) format, and my filesize is around 4 GB. You can capture undebayered video in ser or avi format under Firecapture.
If you like, you can watch me capture and process Jupiter, Saturn and Neptune in Firecapture with my C9.25" SCT, 2.5x powermate and ASI224MC here.
https://youtu.be/yUPhM2kdxNI?t=81
Hope this helps,
Andrew |
Thanks Andrew. It all helps.
There is a little bit of horses for courses though.
1. Firecapture, whilst available for Linux, no amount of coaxing makes it provide as high a frame rate as the ZWO ASICAP software, so we don't use it.
2. The 178 also has smaller pixels than the 224 and therefore has less arc seconds per pixel. This means that regardless of the ROI there are more pixels for a given capture object. This is deliberate and exactly what we are after.
3. We do always use a ROI.
4. SER files are un-debayered.
5. We would not be able to capture at 150FPS simply because this means our exposure time would have to be equal to or less than 6.667ms, which even at maximum gain, is not enough for Saturn for instance with the 6" scope.
6. We have not seen un-debayered AVI files. We only capture monochrome AVI files. When test capturing colour AVI files with ASICAP, they have always been RGB. We'll have another look and test the files again. There has been a recent update so there maybe some changes.
Thanks again for the interesting discussion.
We like your work.