1. A method of processing an image from an image sensor, said method comprising the acts of: generating in an image processor a histogram of numbers of pixels from the image that correspond to possible pixel response values of the pixels of the image and generating an adjustment signal having a luminance adjustment value responsive to said histogram by determining in said histogram a pixel response value below which there are no pixel counts which exceed a predetermined pixel count of zero pixels or more, and using a threshold value associated with that location as said adjustment signal; and using the image processor to adjust the pixel response values of the pixels of said image responsive to the adjustment signal to produce an adjusted image.