Dolev 800/800V/800V² - Brisque Application Issues
Class Screening
Workflow for Application
Output on Film

Conventional
Geometric Dot
HDP
FullTone

Conventional

Exposure resolution/Mesh (Screen Ruling, Raster) Look for System Formats in the Software or look for these Formats in the system Format Booklet.

• For higher productivity choose a format with lower exposure resolution (i.e., 175 lpi ( 70 l/cm) expose with 100 laser dots/mm).
• For higher quality choose a format with higher exposure resolution (i.e., 175 lpi (70 l/cm) expose with 120 laser dots/ mm.
• It is recommended to measure at least 11 increments of Dot%
  0,10,20,30,40,50,60,70,80,90,100
• You should regularly check film linearity to insure that chemistry and processing are consistent.
• An Output Tone Reproduction LUT is necessary to compensate for significant changes in Dot gain. For example you decided to print on newsprint with a higher Screen Ruling than usual. i.e. 133 lpi (55 l/cm) instead of 85 lpi (32 l/cm) with no other changes in print conditions.
• When the same scan is to serve more then a single printing site, where printings conditions are significantly different, a separate Output Tone Reproduction LUT should be built for each site/machine.

Geometric Dot

Exposure resolution/Mesh (Screen Ruling)
Look for Exposure System Formats in the Software or look for these Formats in the system Format Booklet.

• The Geometric dot shape can also be used in HDP applications.
• When creating an Excurve file, it is recommended to divide the DOT% range into more increments than the usual 10 %, especially in the extreme Highlight areas (0%-10%) and Shadow areas (90%-100%). In these areas use 2% increments.
• When exposing very high contrast film and/or HDP, it is also recommended that the Highlight areas 0%-20% and be divided into more increments as above.
• Note that the Geometric dot produces less dot gain than with conventional screens.

HDP

Tips

• It is recommended to use the Composed dot and Shifted angle set.
• When CreoScitex Class Screening (SCS) is selected, the format provides lower resolution than with SSP. Dot quality is actually increased.
  For example:
  Using CreoScitex Class Screening, a file of 600 lpi (240 l/cm) can be exposed with an exposure resolution of 140 laser dots/mm.
  With S.S.P, the same file should be exposed with an exposure resolution of 172-186 laser dots/mm.
• Build the ExCurve file with 24 increments. To ensure linearization, the increments of the highlight ar ea (0%-15%) and Shadow area (85% - 100%), should be smaller and more numerous than the midtone increments
• Recommended increments are:
  1%, 3%, 5%, 7%, 9%, 11% 13% 15%, 20%, 25%, 35%, 45%, 50%, 55%, 65%, 75%, 80%, 85%, 87%, 90%, 92%, 95%, 97%, 100%.
• You should regularly check film linearity to insure that chemistry and processing are consistent.
• Divide the tone range of the Output Tone Reprodution file to the same increments that were recommended for the ExCurve LUT.
• Creating the Output Tone Re production LUT is always positive, independent of whether the process is negative or positive.

FullTone

• Build the ExCurve file with 24 increments. To ensure linearization, the increments of the highlight area (0%-15%) and Shadow area (85% - 100%), should be smaller and more numerous than the midtone increments
• Recommended increments are:
  1%, 3%, 5%, 7%, 9%, 11% 13% 15%, 20%, 25%, 35%, 45%, 50%, 55%, 65%, 75%, 80%, 85%, 87%, 90%, 92%, 95%, 97%, 100%.
• You should regularly check film linearity to insure that chemistry and processing are consistent.
• Divide the tone range of the Output Tone Reprodution file to the same increments that were recommended for the ExCurve LUT.
• Creating the Output Tone Reproduction LUT is always positive, independent of whether the process is negative or positive.