How to transform 16-bit pixels into 8-bit pixels ?

Hi, I want to ask. I already constructed a coding which can only process 8-bit image(grayscale). But my problem right now some image contains 16-bit pixel, which is above 255. I want to detect the pixels that are above 255 and I want to reduce it into 8-bit, I'm not gonna transform the full image into 8-bit because this will affect my image quality. How to construct the coding that can detect pixel that is above 255?

Answer 1

[Walter Roberson]

If you want to reduce the high pixels to 255, then you can just uint8() the array. That will have the same effect as

uint8( min(255, TheArray) )

Otherwise you can use

mask = TheArray > 255;
TheArray(mask) = ... whatever, maybe mod(TheArray(mask), 256)) maybe something else