Issues generating and using the TUNING FILE for ALSC with Picamera2 and Libcamera

[harshilsheth0412]

Hello folks,

I am trying to achieve Lens Shading Correction for an imx219 camera on Picamera2.

I referred to chapter 6 (Camera Tuning) - https://datasheets.raspberrypi.com/camera/raspberry-pi-camera-guide.pdf and followed the steps to generate a tuning file using ctt.py and two .dng images as input.

I generated a tuning file without errors. But when I load the tuning file via Picamera2 api or Libcamera-hello --tuning-file input, I get a segmentation fault error. Seems like it has something to do with the tuning file format generated by ctt.py. Am I missing something here?

I've attached my output logs here:

Seg_fault.txt

[davidplowman]

Hi, thanks for posting this. I see you've also posted this as a bug over at libcamera-apps and there's already been some discussion there. I agree that's probably a better place for it so we'll post any updates there rather than here. Thanks!