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I'm performing measurements using the picamera to test its sensor ov5647. But whenever I took images, it seemed there were adjustments. Gain, white balance and etc. Could I turn off all the adjustment function and just take raw image data? I know there is a bayer format, but I'm not sure if it is the data without adjusted.

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Bayer format captures contain the data prior to almost the entire image processing pipeline (demosaic, auto-gain, auto-white-balance, lens-shading, denoise, etc. etc.). The one exception is flips; if you've set vflip or hflip you need to account for the Bayer pattern being flipped accordingly, but that's it. Other than, it's the raw (10-bit) data straight from the sensor. See the bayer capture recipe for information on unpacking the 10-bit format and a rudimentary de-mosaic algorithm.

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  • Thank you so much for the clear answer. But if you don't mind, I'd like to ask one more thing. Could I avoid auto-gain adjustment by fixing ISO speed? I'm considering using RGB565 format and wondering if I can still disable the auto adjustments.
    – Nownuri
    Jul 9, 2015 at 5:21
  • No - I'm not exactly certain what fixing the ISO setting does, but I can say it doesn't fix the automatic gains. Fixing the gains can be done by setting exposure_mode to 'off'. However, be aware that this will simply fix the gains (which can be queried with analog_gain and digital_gain where they are); at the moment the firmware provides no means of setting the gains to specific values.
    – Dave Jones
    Jul 9, 2015 at 8:13

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