For future readers, this is the code that is being referred: https://github.com/ern0/howto-wasm-minimal/blob/master/inc.cpp#L31-L35 https://github.com/ern0/how

For future readers, this is the code that is being referred: https://github.com/ern0/howto-wasm-minimal/blob/master/inc.cpp#L31-L35 https://github.com/ern0/howto-wasm-minimal/blob/master/inc.c... It should be: uint32_t gray = 0.299 * ptr[i] + 0.587 * ptr[i+1] + 0.114 * ptr[i+2]; ptr[i] = gray; ptr[i+1] = gray; ptr[i+2] = gray;