If a file is to be compressed, standard data compression methods which reduce the file's size without losing information are usually applied to the entire document (see PDF export options, PDF/A export options). When exporting to PDF formats, however, you may choose to treat the images in the document differently, see JPEG compression options. JPEG is good for compressing color images, but unsuitable for monochrome images.
Gray-scale is best for scaling-down 1-bit images.
PDF documents have no need of "finishing" information (such as which media trays to use) because they are intended for use on-screen. Finishing information may, nonetheless, be included in a PDF document: see Solimar® finishing, below.
Converting to gray-scale is of most benefit for scaling down 1-bit real-world images, see Monochrome conversion. Though "lossy", it can reproduce something close to an original gray-scaled image, compressed by half-toning or dithering.
| • | by 4 to 4-bit gray generally gives the best appearance. However, if the image is to be scaled down heavily, then: |
| • | by 8 to 8-bit gray resolution produces a smaller file but a coarser appearance. |
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| 1. | Select an Image option:
Paper size only The image is trimmed to the size of the selected paper.
Printed region only White space is removed to leave the smallest rectangle which will contain all the printing.
Printable region only The image is trimmed to the area of the page which a PCL printer would print on.
Selected area only Outputs the area that has been swept out. If an area has not been swept out, the first field found is used to define the area. If neither an area nor a field can be found, the default ("Full", see below) is used.
Full The default. The whole page is output, including any items which fall outside the area of the page. |
| 2. | If you would like to add a Border around the trimmed image, key-in the width of the Left, Top, Right, Bottom borders and select the appropriate units: Cm, Inches or Pixels. For example, 1,3,1,3 adds 1 unit to the sides and 3 units to the top and bottom of the image. |
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| • | If the document needs to be printed a specific size using Adobe Acrobat, tick Unscaled printing. This ensures that the document will not be "scaled to fit" by default and so the dimensional accuracy of the printed document will be maintained. |
| • | If you have set up a Table of Contents it will be generated when the document is exported to PDF or PDF/A. To override this, tick Do not make a Table of Contents check-box. |
| • | The preferred compression mode for monochrome document export is usually CCITT4 and so the Permit CCITT4 compression check-box is ticked by default. You may disallow CCITT4 compression by de-selecting this option (although it is unusual for PDF readers not to cope with CCITT4 compression). |
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On Solimar systems, finishing instructions are carried on the "front" (i.e. odd-numbered) page of each sheet of paper. To set up the media instructions for Solimar finishing, select an option from the drop-down list:
| • | Use tray numbers as specified in the original file. |
| • | Use PCL trays Specify a PCL tray number by clicking the View trays button then editing the spin box value. |
| • | Use trays appropriate to input format To view/edit tray set-ups, click View trays button. |
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Links
Image import/export options
Image compression
JPEG compression options
Shading options
Simplex and duplex options
