ABCDEFGHIJKLMNOPQRSTUVWXYZ
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version 2
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4 bytes - off 0x0
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"YAIF" utf-8
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2 bytes - off 0x4
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version number
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2 bytes - off 0x6
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image width
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2 bytes off 0x8
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image height
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1 byte off 0x9
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palette size
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4 bytes off 0xA
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image size
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4 bytes off 0xF
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4 characters utf-8
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#palette size bytes off 0x13
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palette data 8 bit integers (r,g,b)
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#image size bytes off palette size + 0x13
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image data 4 bit integers [x+width*y]
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