[HOW-TO] Calling switch_mode_and_capture_image from function and then exit

[eat-sleep-code]

Please only ask one question per issue!

Describe what it is that you want to accomplish I have this code:

def captureImage(filepath, raw = True):
    captured = camera.switch_mode_and_capture_image(configStill)
    captured.save('main', filepath)
    if raw == True:
        filepathDNG = filepath.replace('.jpg', '.dng')
        captured.save_dng(filepathDNG)
    return

I am calling it like this...

print(' Capturing image: ' + filepath + '\n') 
captureImage(filepath, raw)  
print('did I come back here?')   #This line and any subsequent lines never fire.   I would expect it should return to this section after the capture is complete. 

Describe alternatives you've considered I am trying to migrate an existing picamera project to picamera2

Additional context Here is the current repo: https://github.com/eat-sleep-code/camera/tree/picamera-2-migration

[davidplowman]

Hi, thanks for the question.

So I think the problem is that you're using switch_mode_and_capture_image which returns a PIL image in RGB format, and there's no way to get back from this to the raw buffer from which you could save a DNG.

There are many ways to do all this, but we also provide a couple of examples that might help: https://github.com/raspberrypi/picamera2/blob/main/examples/capture_dng.py captures just the DNG, whereas https://github.com/raspberrypi/picamera2/blob/main/examples/capture_dng_and_jpeg.py captures both a JPEG and a DNG.

Please let us know if there's anything else we can help with. Thanks!

[davidplowman]

Hi, just wondering if there was any update here or anything related that we can help with? Thanks!

[davidplowman]

Hi, I think I'll close this one for now if that's ok, but please open a new issue if there's anything else for us to look at. Thanks!