Added scaling option to save disk space #297
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This will help save space, especially with the Pi HQ cam. Binning generated moving hot pixels on my cam which were not really removed by dark frame subtraction.
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Thanks Stefan, I just merged your code. It's a nice addition to the software. I have set the feature to |
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You're welcome. It's a really great project and I appreciate all your work. My cam is currently running in test mode and will be installed in it's final place above all street lights and buildings soon - check out https://sternwarte-gartenstadt.de/allsky A default of |
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Hi Thomas,
Files of the Pi HQ cam are quite large (about 5+ MB). First, I tried the 2x2 binning option so save some space but that generated quite strange artifacts and especially a hot pixel that is not there when not using binning. You can get rid of it with dark frame subtraction, but only for some time - it seems to move and then leaves a black spot with a new hot pixel next to it in the binned image.
As this effect doesn't occur when using the full resolution (1x1 binning) and I even don't have hot pixels at all in that mode (on-chip dead-pixel correction is switched on), I added an option to scale down the picture before saving it in the daily folder. Reducing the image size by a factor of 2 leaves me with individual images of around 1,3 MB each - and with no artifacts or hot pixels, and no urgent need for darks. Additionally, switching on binning seems to dramatically reduce sensitivity of my HQ cam - not that I understand that ;-)
Maybe you want to add it to your version.
Stefan