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Convert 8 bit depth color image to 7 bit depth

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EDA_hg81

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I just want to shift data to right one bit. But some small value RGB data are going to be zero and the histogram of this image is going to be changed.

Do you have any idea to realize it?:cry:
 

Depending on the device you are using, just use some internal RAM (i.e. Block RAM in Xilinx) and create your own 8-bit to 7-bit lookup table.
 

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