Pictures with Camera2 API are really dark

Question

I\'m working on Android and I\'m trying to capture a picture without displaying any preview. I tried to simplify the process by making a class. It\'s working but all the pic

Answer 1

In my case just configuration FPS helps me. And don't forget to put it to CaptureRequest.Builder for preview and ALSO to CaptureRequest.Builder capture builder. As usual FPS 10 or 15 frames quite enough for photo and preview.

Capture builder

// This is the CaptureRequest.Builder that we use to take a picture.
final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
...
setupFPS(captureBuilder);

Preview builder:

// We set up a CaptureRequest.Builder with the output Surface.
mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mPreviewRequestBuilder.addTarget(surface);
                ...
// set FPS rate
setupFPS(mPreviewRequestBuilder);

Where setupFPS:

private void setupFPS(CaptureRequest.Builder builder){
        if(fpsRange != null) {
            builder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fpsRange);
        }
}

And initialization of FPS with:

CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
try {
                    Range[] ranges = characteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
                    if(ranges != null) {
                        for (Range range : ranges) {
                            int upper = range.getUpper();
                            Log.i(TAG, "[FPS Range Available]:" + range);
                            if (upper >= 10) {
                                if (fpsRange == null || upper < fpsRange.getUpper()) {
                                    fpsRange = range;
                                }
                            }
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                Log.i(TAG, "[FPS Range] is:" + fpsRange);