11-12 GA-1120 Color Management - Toshiba

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2-2 Color Calibration An overview of calibration Calibration generates curves that adjust for the difference between the actual toner densities (measurements) and the response expected by the output profile. • Measurements represent the actual color behavior of the copier. • Calibration sets are sets of measurements. • A calibration target that describes the expected behavior of the copier is contained in each output profile. Once you have calibrated the GA-1120, a calibration set is stored. This calibration set will be used when it is associated with an output profile. Every output profile has an associated calibration set. If you have not specified one, the calibration set associated with the default output profile is used. If you change the calibration after a saved job has been processed (RIPped), you do not need to reprocess (reRIP) the job. The new calibration affects the job without needing to be reprocessed. NOTE: Changing calibration has the potential to affect all jobs for all users, so you may want to limit the number of people authorized to perform calibration. You can set an Administrator password in GA-1120 Setup to control access to calibration (see the Configuration Guide). Understanding calibration Although most users’ needs are met by the default calibration set, the GA-1120 allows you to choose a calibration set to customize calibration for specialized jobs. Calibration allows you to: • Maximize the color reproduction capabilities of the GA-1120. • Ensure consistent color quality over time. • Produce consistent output across GA-1120 servers. • Achieve better color matches when reproducing spot colors such as PANTONE colors or other named color systems.
2-3 Understanding calibration • Optimize the GA-1120 for using ColorWise rendering styles (CRDs) and CMYK simulations, and for using ICC profiles. How calibration works Success in obtaining satisfactory print quality from the GA-1120 depends on many factors. Among the most important are establishing and maintaining optimal toner densities. The density is the measure of the light absorbed by a surface. By carefully regulating toner densities, you can obtain consistent printed color. Even with a calibrated system, toner density is affected by service settings, humidity, and temperature; density also tends to drift over time. Regular measurement detects day-to-day variations in densities, and calibration corrects for them. Calibration works by creating calibration curves on the GA-1120 that compensate for the difference between actual (measured) and desired (target) density values. These calibration curves are the graphic equivalent of transfer functions, which are mathematical descriptions of changes that will be made to the data you start with. Transfer functions are often graphed as input or output curves. The GA-1120 generates calibration curves after comparing measured values to the final target values for each of the four toner colors. The target values are based on the output profile specified. Measurements Measurement files contain numerical values that correspond to the toner density produced by the copier when it prints solid cyan, magenta, yellow, and black, and graduated tints of those colors. To create a measurement file, first print a page of color patches. Then measure the patches using either a color measurement instrument connected to a computer on the network or, if it is available, the print device’s scanner. The new measurements are automatically downloaded to the GA-1120.
Page 1 and 2: TOSHIBA GA-1120 COLOR GUIDE
Page 3 and 4: Copyright © 2002 Electronics For I
Page 5: Proprietary Rights You acknowledge
Page 8 and 9: viii Contents Starting Calibrator 2
Page 11 and 12: Introduction xi About this manual T
Page 13: xiii Key features of ColorWise Colo
Page 16 and 17: RGB data CMYK data Spot color data
Page 18 and 19: RGB Separation Output/Simulation 1-
Page 20 and 21: 1-6 GA-1120 Color Management select
Page 22 and 23: 1-8 GA-1120 Color Management If you
Page 24 and 25: 1-10 GA-1120 Color Management The C
Page 26 and 27: 1-12 GA-1120 Color Management are p
Page 28 and 29: 1-14 GA-1120 Color Management • O
Page 30 and 31: Choose ColorWise 1-16 GA-1120 Color
Page 32 and 33: 1-18 GA-1120 Color Management Setti
Page 34 and 35: 1-20 GA-1120 Color Management 3. In
Page 38 and 39: 2-4 Color Calibration Output profil
Page 40 and 41: 2-6 Color Calibration Starting Cali
Page 42 and 43: Calibration methods appear here 2-8
Page 44 and 45: 2-10 Color Calibration Restoring de
Page 46 and 47: 2-12 Color Calibration 8. Click Mea
Page 48 and 49: 2-14 Color Calibration Calibrating
Page 50 and 51: Indicator light Sample aperture (un
Page 52 and 53: 2-18 Color Calibration In the Paper
Page 54 and 55: 2-20 Color Calibration When the pat
Page 56 and 57: 2-22 Color Calibration 5. Choose th
Page 58 and 59: 2-24 Color Calibration Calibrating
Page 60 and 61: 2-26 Color Calibration TO REMOVE CA
Page 62 and 63: 3-2 ColorWise Pro Tools NOTE: If yo
Page 64 and 65: 3-4 ColorWise Pro Tools 4. Click OK
Page 66 and 67: 3-6 ColorWise Pro Tools TO BACK UP
Page 68 and 69: 3-8 ColorWise Pro Tools TO DEFINE A
Page 70 and 71: 3-10 ColorWise Pro Tools Simulation
Page 72 and 73: 3-12 ColorWise Pro Tools 4. For a s
Page 74 and 75: A curve with this shape makes a col
Page 76 and 77: 3-16 ColorWise Pro Tools TO EDIT A
Page 78 and 79: 3-18 ColorWise Pro Tools TO CORRECT
Page 80 and 81: 3-20 ColorWise Pro Tools 8. In the
Page 82 and 83: 3-22 ColorWise Pro Tools Color Setu
Page 85 and 86: Appendix A: Color Measurement Instr
Page 87 and 88:
Unused connector A-3 Color Measurem
Page 89 and 90:
A-5 Color Measurement Instruments 6
Page 91 and 92:
A-7 Color Measurement Instruments 7
Page 93 and 94:
Unused connector Connect to compute
Page 95:
A-11 Color Measurement Instruments
Page 98 and 99:
B-2 Importing density measurements
Page 101 and 102:
Index A Absolute Colorimetric rende
Page 103 and 104:
I-3 Index calibration sets for 2-3,
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