Hi Maurice,
Thanks, you can convert your old master calibration files from PI to APP, but it is not so easy. The main reason being:
APP uses the whole sensor of your camera for the creation of the calibration frames. And a program like PI, that has a dependency on DCRAW doesn’t do this. So the calibration frames that PI makes have smaller image dimensions than those of APP.
To use your old master calibration frames you need to figure out what offsets to add on all 4 borders of your PI calibration masters to get to the correct image dimensions for your whole sensor. I can help with this if you want to. I have done this conversion for instance on old calibration files of Scott from Images Plus, which also has the dcraw dependency.
You can use the batch modify tool, it can even uncrop and undebayer, something I needed to do on Scott’s data.
But for now, it’s probably best to use new bias frames. That will be much easier for now.
Let me know if you succeed in calibrating your lights properly.