glReadPixels How to get pixel value

Question

I use this function to return such a value. I hope to get the RGB value of each pixel, which is 0 to 255, not 0 to 1. What should I do

data = glReadPixels(0,0, w, h, GL_RGB,GL_UNSIGNED_BYTE)
print(data)

output

\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad\xd1\x9e\xad

Answer 1

Use numpy.frombuffer to convert the string to a byte array:

import numpy

data = glReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE)
byte_array = numpy.frombuffer(data, dtype='uint8')
print(list(byte_array))

Or use ctypes.from_buffer_copy

import ctypes

data = glReadPixels(0,0, w, h, GL_RGB,GL_UNSIGNED_BYTE)
byte_array = (ctypes.c_ubyte * (w * h * 3)).from_buffer_copy(data)
print(list(byte_array))