Digital Printing Reference   21
Recommendations for Finish/Smoothness
•  
Use smooth or coated papers for proper dry ink transfer to ensure the 
best color density and image detail, and to increase the appearance 
of glossiness. Using a very smooth paper is especially important when 
printing fine lines and detailed images.
Shade
Shade is the color of the paper. Paper shade may change the colors of 
printed images because dry ink is applied in dot patterns that allow the 
paper shade to show through. Lighter images reveal more of the paper 
color than darker images.
Recommendations for Shade
•  
Select a true white for the truest colors and natural-looking skin tones.
•  
Be aware that shaded paper will affect image colors and overall hues.
• 
Remember that paper shades can vary significantly among brands  
and lots.
Stock
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22   Digital Printing Reference
Formation
Formation is the distribution of fibers and fillers in paper. Fibers and fillers 
should be distributed evenly throughout the sheet. Although formation 
is not included in the manufacturer’s specifications, you can check it by 
holding a sheet up to a light. If the sheet looks even throughout, it has 
good formation. If you see uneven light and dark areas, formation is poor.
Good formation is especially important when documents include halftone 
images of photographs or high ink coverage. Halftone images appear 
sharper on paper with good formation. Solid images can appear uneven 
or spotty when printed on paper with poor formation.
Recommendations for Formation
•  
Choose paper with good formation to ensure uniformity of  
color images.
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Digital Printing Reference   23
Impurities
Impurities in the paper-making process can leave tiny specks in some 
stocks. The specks can appear as marks or spots in printed images, 
especially in high resolution images, fine type and fine lines.
Impurities in recycled papers consist of inks and adhesives (from window 
envelopes, stick-on notes, labels, etc.). These elements are difficult to 
remove during the recycling process.
Recommendations for Impurities
•  
Use high-quality, non-recycled papers when the best image quality  
is required.
Stock
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24   Digital Printing Reference
Opacity
Opacity impacts the ability of a printed image to show through from the 
opposite side of a sheet or from another sheet below it. To increase a 
paper’s opacity, filler may be added to increase thickness or applied as  
a coating.
Opacity is measured according to how much light a sheet blocks and is 
expressed as a percentage between 0 and 100. Most papers fall within 
the 80% to 90% range. However, an opacity of 98% will prevent a printed 
image from showing through on the opposite side of the sheet.
Recommendations for Opacity
• 
Choose paper with high opacity when printing on both sides of the 
paper or when heavy dry ink coverage will be applied.
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Digital Printing Reference   25
Size and Weight Specifications
The following links provide the locations of a number of digital press 
specifications sheets.
iGen4
®
http://www.xerox.com/digital-printing/digital-printing-press/ 
color-printing/xerox-igen4/spec-enin.html
Xerox
®
Color 800/1000 Presses
http://www.xerox.com/digital-printing/printers/digital-press/
xerox-800-1000/enin.html
Xerox
®
DocuColor
®
8080
http://www.xerox.com/digital-printing/digital-printing-press 
/color-printing/docucolor-8080/enin.html
Xerox
®
Color C75/J75 Press
http://www.xerox.com/digital-printing/printers/digital-press/ 
xerox-c75/enin.html
http://www.xerox.com/digital-printing/printers/digital-press/ 
xerox-j75/enin.html
Xerox
®
Color 560/570
http://www.xerox.com/digital-printing/printers/digital-press/ 
xerox-color-550-560/enin.html
Stock
26   Digital Printing Reference
There is a long list of stocks that can be printed on a digital press. See your 
printer or service bureau for a list of the supported media.
Table 1-3 Stocks that can be run on a digital press
Stock Types Recommended
Bond
Perforated and scored paper
Bristol
Preprinted
Cover weight—coated and uncoated
Recycled
Drilled paper
Synthetic papers and plastics
Index
Text weight—coated and uncoated
Label stock
Tabs
Xerox takes extra steps to ensure consistent quality among our offerings. 
See www.xerox.com/supplies
Stock Recommendations
Digital Printing Reference   27
The following stocks are not recommended for a digital press:
Table 1-4 Stocks that should not be run
Stock Types Not Recommended
Highly conductive papers, such as foil-backed papers
Stocks with melting points at or below 365° F (185° C)
Stocks outside the size and weight ranges listed on the product  
specification sheets
Non-paper backed transparent stocks (iGen4® only)
Stocks with caliper greater than 500 microns (18 pt)
Stocks containing talc or plasticizer
Preprinted sheets printed with non-laser compatible inks or inks that are not 
sufficiently cured
Preprinted sheets that were dried with offset drying powder
Stock
28   Digital Printing Reference
Digital Printing Reference   29
Setup
2
Before You Begin
• 
Color Model to Use
• Color Decisions
• 
Color Consistency 
Adobe
®
Creative Suite
®
QuarkXPress
®
• 
Soft Proofing 
Setup
30   Digital Printing Reference
Each color space has a defined gamut—a range of possible colors. There 
is no single color space that can reproduce all the possible colors from the 
entire spectrum. Some color spaces can reproduce more shades of red but 
fewer blues, while other spaces can produce a wide range of blues but  
fewer reds.
A digital press can produce many colors that are outside the gamut of 
traditional U.S. Web Coated (SWOP) v2 offset systems such as vivid blues, 
bright purples and brilliant magentas. Maintaining image files in the 
Adobe
®
RGB 1998 color space allows designers to take advantage of the 
digital press’s wider color gamut. The answer is not so simple, however, 
because there are benefits to working in CMYK as well.
Color Model to Use
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