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Questions about PHP image binarization

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I want to use PHP to solve the problem of image binarization in php, but I am not very familiar with the specific steps. do you have any tips! I am very grateful to you for sharing the following: more questions about PHP image binarization
I want to use php to process Image binarization, but I am not very familiar with the specific steps. do you have any tips! Thank you very much.

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------ Solution --------------------
Image binarization is to set the gray value of the pixel on the image to 0 or 255, that is, to display the entire image with a clear black and white effect.

1. convert a color image into a black/white image
2. set each pixel to black (0, 0, 0) or white (255,255,255) respectively based on the specified threshold value)

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