On Tue, Apr 7, 2015 at 10:51 AM, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > Black level compensation is applied by the CCDC before writing raw frames to > memory. If your raw frames are correct BLC is probably not to blame. > > The default contrast is x1.0 and the default brightness is +0.0, so I don't > think those should be blame either. > > I suspect the RGB2RGB conversion matrix to be wrong. The default setting is > supposed to handle fluorescent lighting. You could try setting the RGB2RGB > matrix to the identity matrix and see if this helps. See > http://git.ideasonboard.org/omap3-isp-live.git/blob/HEAD:/isp/controls.c#l184 > for sample code. > > Another matrix that could be worth being reprogrammed is the RGB2YUV matrix, > which also defaults to fluorescent lighting. Sample code to reprogram it is > available in the same location. I tried changing the rgb2rgb matrx to the identity matrix: {0x0100, 0x0000, 0x0000}, {0x0000, 0x0100, 0x0000}, {0x0000, 0x0000, 0x0100} And the csc (rgb2yuv) to this: {256, 0, 0}, {0, 0, 0}, {0, 0, 0} But I couldn't see much, if any, difference. However, when I forced the gamma correction to be bypassed, it seemed to fix it. Does that make sense? I guess I don't understand it enough to understand if gamma correction would have compressed all my luma values. Thanks, Chris -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
