© 2016 Thorlabs Scientific Imaging
2 Camera Basics
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Contrast adjustment with 8 bit output data
The second example shows the same output image with a 10 bit bit depth right at the time of
capture. This image also has low contrast, as it features only average brightness values. The
greater bit depth allows the brightness values of the image to be imaged over 500 different digital
levels, however. The entire histogram includes 1,024 values in the 10 bit image (in contrast to 256
values with 8 bits).
This means that a contrast adjustment can now be made for screen display without a reduction in
quality. The 500 values of the output image are distributed over the 256 values of the 8-bit target
image in such a way that optimum contrast is the result. The large number of output values means
that there are no gaps in the histogram.
Contrast adjustment with 10 bit output data
Note
This type of contrast adjustment can already be done in the camera when an image is digitized in
10 bits and transferred in 8 bit. In this case, optimum utilization of the 8 bit data is also important for
image processing.
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