The first byte is used to detect transmission over a 7-bit channel–for example, email transfer programs often strip the 8th bit, thus changing the PNG signature. The 2nd, 3rd, and 4th bytes simply spell “PNG” (in ASCII, that is). Bytes
The first byte is used to detect transmission over a 7-bit channel–for example, email transfer programs often strip the 8th bit, thus changing the PNG signature. The 2nd, 3rd, and 4th bytes simply spell “PNG” (in ASCII, that is). Bytes