HP d640 HP D640 High-Volume Printer - Technical Reference Manual, C5630-90030 - Page 37

XResolution, 011A, Rational

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Table 8 Baseline TIFF Definitions ** 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. Chapter 3: Working with TIFF Images 31

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Chapter 3: Working with TIFF Images
31
** XResolution
011A,Rational,1
The number of pixels per ResolutionUnit in the horizontal
(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
011B,Rational,1
The number of pixels per ResolutionUnit in the vertical
(ImageLength) direction.
If the resolution specified is not the same as the currently-
selected printer resolution (200, 300, or 600 dpi), the image data
is scaled in the vertical direction as described above for
XResolution.
Table 8
Baseline TIFF Definitions