fix colorReduce4 #3
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I've test it, origin code will generate a bad image.
Comment abundant & error process, changed line 278, 289.
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I've test it, origin code will generate a bad image.
Github had automatically converted source code's encoding from GB18030 to UTF8.
Valid change is line 177:
origin:
*(data+i)= *data&mask + div/2;
change to:
*(data+i)= *(data+1)&mask + div/2;