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Graphics Interchange Format  |  1997-01-13  |  46.2 KB  |  246x523  |  4-bit (16 colors)
   ocr: Byte 0 Logical Screen Width Byte 1 Byte 2 Logical Screen Height Byte 3 Byte 4 Background Byte 5 Color Index Pixel Byte 6 Aspect Ratio Global Color-TableFlag (one bit) Color Resolution (three bits) Sort Flag (one bit) Size, of Global ColorTable (three bits) Figure 1: Logical-screen-C descriptor layout.