JEITA  CP-3451 - 69 - The method of describing the various image width data with and without padding is given in Figure 30. It shall be noted carefully that the value of SOF is used in some cases to describe the valid image width, and in others to describe the image width after padding.   Figure 30 Image Data Width Description Table 19 gives examples of information recorded in the direction of image width and padding data width, for each of cases A, B, and C of Figure 30.   Table 19 Typical Width Direction Information and Padding Data Valid Image Width PixelXDimension SOF Information Compressed Data Padding Width A 640 640 640 640 0   B 634 634 634 640 6 (< 1MCU) C 620 620 640 640 20 (> 1MCU) Padding in multiple of 64 ? PixelXDimension = X SOF.X = X Padding in multiple of 64 Xpad = Padding width Xpad larger than 16 ? PixelXDimension = X SOF.X = X PixelXDimension = X SOF.X = X + Xpad JPEG Compression No Yes No X: Valid image width SOF.X : Holizontal line value in SOF PixelXDimension :     PixelXDimension tag value X=multiple of 64 ? X=multiple of 16 ? Padding in multiple of 16 No Yes Yes No Yes A B C