What format is for Android camera with raw pictureCallback?

Question

I am trying to use data from Android picture. I do not like JPEG format, since eventually I will use gray scale data. YUV format is fine with me, since the first half part i

Answer 1

You may have some luck with getSupportedPictureFormats(). If it lists some YUV format, you can use setPictureFormat() and the desired resolution, and ciunterintuitively you will get the uncompressed high quality image in JpegPreview callback, from which grayscale (a.k.a. luminance) can be easily extracted.

Most devices will only list JPEG as a valid choice. That's because they perform compression in hardware, on the camera side. Note that the data transfer from camera to application RAM is often the bottleneck; if you can use stagefright hw JPEG decoder, you will actually get the result faster.