High resolution photo filtering

[mmmwww]

Preview from camera is filtered properly but taking a high resolution photo results in a dark image. It can be observed only if the video quality is set to lower (i.e. 640x480) and the image quality is set to Photo. Please check example screenshot and image attached.

I also found issues when using multiple passes (and using intermediate results as texture samplers in shaders) but I would need to properly describe the problem (I've sent e-mail to xissburg earlier :-)