Why are the images from Camera2API green?

Question

While using Camera2API in Android as CameraMetadata.CONTROL_MODE_OFF, the images care coming with A LOT OF green, just like as if there is only a green channel.
The code I used is:

final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(imageReader.getSurface());

captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_OFF);
captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
captureBuilder.set(CaptureRequest.CONTROL_AWB_MODE, CaptureRequest.CONTROL_AWB_MODE_AUTO);
captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME,Long.valueOf("2000000000"));
captureBuilder.set(CaptureRequest.SENSOR_SENSITIVITY,200);

But when I set the CameraMetadata to CONTROL_MODE_AUTO, as in

captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);

then the images are correct (not green).

Why is that and what must be done to avoid it?

user_2548988 · Answer

You basically answered your own question, the documentation for CONTROL_AWB_MODE says

This control is only effective if android.control.mode is AUTO.

So CONTROL_MODE_OFF takes precedence over each individual control of 3A routines. If you need to disable just some of them, keeping the others in AUTO, use per-routine controls CONTROL_AE_MODE, CONTROL_AF_MODE and CONTROL_AWB_MODE.

Why are the images from Camera2API green?

1 Answers