Reply To: Pixel Value and Exposure

Forums Imaging Pixel Value and Exposure Reply To: Pixel Value and Exposure


Dear colleagues, there is another small (small so to speak) problem. The attached graph shows the pixel values of images of the usual white sheet, taken with a nikon D3000 camera and varying only the shutter speed. A few things emerge:
1 – the maximum PV value, corresponding to the minimum shutter speed, is 255. As if I had shot in jpg format;
2 – there is no proportionality between PV and shutter speed. The function is completely different from the one in Robin’s graph;
3 – the PV-lens surface graph is almost linear at each iso.
The sensor of the nikon is of the CCD type.

I would ask for help in interpreting these at least apparent inconsistencies.

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