HP d640 HP D640 High-Volume Printer - Enhanced Features Manual, C5620-90027 - Page 44

Baseline TIFF definitions ** StripOffsets 0111,Short/ Long,StripsPerImage For each strip, the byte offset of that strip. As with other offsets, the offsets are specified with respect to the beginning of the TIFF file. For the D640 printer, HP recommends, they be in ascending sequence and do not have a value less than the file position of the offset. SubfileType An indication of the kind of data contained in this sub-file. 00FF,Short,1 Recognized but not used (obsolete). Threshholding For black and white TIFF files that represent shades of gray, the 0107,Short,1 technique used to convert gray to black and white pixels. ** XResolution The number of pixels per ResolutionUnit in the horizontal 011A,Rational,1 (ImageWidth) direction. If the resolution specified is not the same as the currently selected printer resolution (200, 300, or 600 dpi), the image data may be scaled in the horizontal direction by the ratio of printer resolution to specified resolution. For Group 3 and Group 4 compression modes (compression = 2, 3, or 4), scaling is performed for all ratios, whether scaling up (expanding the data) or scaling down (reducing the data). For uncompressed data (compression =1) or PackBits compression (compression = 32773), scaling down is not performed, and scaling up is confined to ratios 2, 3, 4, 6 and 8. Other ratios are treated as the nearest lower ratio. Ratios less than 2 are treated as 1 (no scaling). ** YResolution The number of pixels per ResolutionUnit in the vertical 011B,Rational,1 (ImageLength) direction. If the resolution specified is not the same as the currentlyselected printer resolution (200, 300, or 600 dpi), the image data is scaled in the vertical direction as described above for XResolution. 40 Chapter 3: Technical Reference