View Response single channel (Uncalibrated Device Tonality)Before: After:0% Cyan change -5% Cyan @ midtone = +5% Cyan response Graphic Communications Group
Conversion AdjustmentsKey Points: Adjusts SCO to PCO Curve Controlled Device Edits (Curves and/or DeviceLinks) Offset Press, Approval, Spectrum, etc. Non-Curve Controlled Device Edits (DeviceLinks only) Inkjet proofer, Digital Press, etc. Graphic Communications Group
Conversion Adjustments (tonal curve adjustment tool) Expected Tonality Graphic Communications Group
Conversion Adjustments 3-color gray balance Before – current color of SCO. After – Desired color of SCO to match PCO. Graphic Communications Group
Conversion Adjustments (View Curves - Calibration curve adjustments)shows complete calibration curves that will be fed to Prinergy for SCO Enable editingSelect Separation Choose node points or Enter node point. Graphic Communications Group
Conversion Adjustments (View Curves - Simulation curve view only) Exclude Device Curves from graph view has no effect on edits Graphic Communications Group
Conversion Adjustments (View Response – Expected tonality of SCO output)Two view options available: Graphic Communications Group
Conversion Adjustments (DeviceLink adjustments) White Point Input Tonality Output Tonality Graphic Communications Group
Conversion Adjustments (DeviceLink white point edits) Device link must be created with absolute color rendering intent. “Adjust displayed colors” – visually simulate before paper color view. “In” values are always 0 reference values. Graphic Communications Group
Conversion Adjustments (DeviceLinks Input / Output Curves) Similar Curve editing functionality options - as described previously General “Rule of Thumb” – edit output curves. It will correct the majority of problems with proofing mismatches Graphic Communications Group
Simulation AdjustmentsKey Points: Adjusts PCO to Simulation Target View Curves - Shows complete calibration curves that will be use in Prinergy for SCO View Response – Expected tonality to match simulation target Edits: 9Calibration Curves (device and simulation curves views) 9Simulation Curves only (exclude device curves from curve view). 9DeviceLinks Graphic Communications Group
Conversion or Simulation DeviceLinkIf conversion or simulation includes Curves and DeviceLink: Best Practices: edit the DeviceLink Output Curves. Has the same effect as editing curves only . Graphic Communications Group
Image Preview – tiled TIFF formatBest Practices: Choose an image file or graphic design file that has agood cross-section of colors separated the way “live” content is separated Graphic Communications Group
Image Preview – colorimeters Graphic Communications Group
Final Thoughts – Edit StrategyBest Practices: Create a new ColorFlow Snapshot to capture an editing session Once edits have been verified, approve the new snapshotNote: Duplicating a Color Setup to capture edits can be problematic sinceedits can be applied to duplicate device conditions in the original colorsetup. Graphic Communications Group
41 Reports
Using ColorFlow Reports Comprehensive ColorFlow reports can help you document performance, summarize color response, and assist in troubleshooting. In this module you will learn to: – Create a Print Characterization Report for a device in a given device condition – Read a Print Characterization Report – Create a Print Comparison Report • Comparing a device to a device condition • Comparing two devices in the same device condition • Comparing a device to a reference. – Use reports for documentation, verification and troubleshooting
Creating ColorFlow Reports ColorFlow produces two types of reports: – Print Characterization Reports - present information on a device based on measurement data. – Print Comparison Reports - illustrate the differences between a device and a selected target. Reports are generated from the Measurement tab Reports are saved as a PDF file Note: ColorFlow software uses the page size of your default printer to generate the PDF file of the report. Ensure the page size is either A4 or 8.5 x 11 inches before generating the report. 68
Creating Print Characterization Report Click on the measurement icon for the selected device in the Color Setup Select the measurement tab at the top of the window Highlight the data file Click the Report button Characterization Report – Fill in the fields in the characterization section – User Comment text will populate on each page of the Report – Notes text displays on the Configuration section 1.3 – Click save – Chose the location for where the file is saved – Rename the file name if desired.
Creating Comparison Report Click on the measurement icon for the selected device in the Color Setup Select the measurement tab at the top of the window Highlight the data file Click the Report button – Click on the “compare to” box – Select either “Other Device” or Device Condition and choose another device, device condition or reference in the draw down – Fill in all the fields in the characterization section – User Comment text will populate on each page of the Report – Notes text displays on the Configuration section 1.3 – Click save – Chose the location for where the file is saved – Rename the file name if desired
About Print Characterization Report Present information on a device in a device condition based on the colorimetric measurement data Reports charts key metrics of the uncalibrated state by removing any calibration applied Can show the effects of a calibration curve for curve controlled devices Useful for documenting the state of a device in a device condition for future reference or for determining if a device is in optimum state Can be used for analysis, benchmarking, or troubleshooting a device in the chosen device condition
About Print Characterization Report Print Characterization Report provides computed data for: Absolute densities of the process solids • Average densities and range • Apparent traps • Density across the form (sheet) Tonality of the uncalibrated state of the device • Tonal Value Increase (dot gain) graphs • Tonal Value Increase with calibration removed • Values at 40% and 50% input tints • Print Contrast Color • Plot of a*b* for Primaries and Overprint ramps • CIELAB values of Solid Primaries and Overprints • 3 Color Grays plotted and CIELAB values
Print Characterization Report - Overview Section 1 Configuration Lists the device and the device condition parameters of the color response detailed in the report Section 2 Absolute Density of Solid Inks Reports the average, maximum and minimum absolute densities, density across the test form and Apparent Trap Density for overprints. Section 3 Tonality Describes the tonal response of individual inks, the natural response of the device, the TVI values after removing the curves for the 40% and 50% input tints and Print Contrast values (ratio of the 75% tint and solid densities) Section 4 Color Reports the color response of the device's print condition attributes Section 5 Uncalibrated Tonality Lists the effective dot area (EDA) of each ink after removing calibration curve that have been applied
About Comparison Report Comparison Reports present information on a device in a device condition based on the colorimetric measurement data. Comparison reports document the results of a calibration versus the targeted colorimetric data or an ISO TVI curve. ColorFlow provides industry reference data sets from FOGRA, GRACoL, SWOP, IFRA, and PSR Gravure. ColorFlow also provides the data for the eight (8) ISO 12647-2 Curves for TVI comparison with an option for using a separate target ISO curve for black (ie: ISO TVI Curve A used for CMY and ISO TVI Curve B used for K).
About Comparison Report Comparison Reports can be used for: calibration verification analysis of the device benchmarking an existing device condition troubleshooting a device in the chosen device condition identifying potential problem color builds determining the accuracy of a color reproduction analyzing new stocks, inks or other variables
About Comparison Report Comparison Reports can be used to compare a device to: Another device in the same device condition The targeted colorimetric reference data provided by ColorFlow ISO TVI Curves provided by ColorFlow Other device conditions in the same Color Setup Device Conditions in other Color Setups
About Comparison Report Comparison Reports provides computed data for: Absolute densities of the process solids • Average densities and range • Apparent traps (solid overprints) • Density across the form (sheet) Tonality of the uncalibrated state of the device • Tonal Value Increase (dot gain) graphs versus target • Tonal Value Increase with calibration removed • Values at 40% and 50% input tints • Print Contrast Color • Graph of a*b* for primaries and overprint ramps versus target • CIELAB values of Solid Primaries and Overprints versus target • Color difference distribution and cumulative frequency • Selected 3 Color Grays builds plotted and CIELAB values • 3 Color Gray L*,a*,b* ramp plotted separately versus target • Chroma extent of the color gamut versus target
Overview of Comparison Reports Section 1 Configuration Lists the device and the device condition parameters of the color response detailed in the report and the target used for the comparison Section 2 Absolute Density of Solid Inks Reports the average, minimum and maximum absolute densities, the density across the t form and the apparent trap density for overprints Section 3 Tonality Describes the tonal response of individual inks, lists the TVI values ( 40% and 50% input tints) and the print contrast values (ratio of the 75% tint and solid densities) Section 4 Color Reports the color response of the device's print condition attributes versus the selected target, deltaE (a,b) for each reported patches, avarage and maximum deltaE, substrate deltaE, average of the primary solid deltaE and Color Difference Distribution and Cumulative Frequency graphs Compare the 3 Color Gray, Gray balance L*,a*,b* and color gamut of the selected device condition against the target Section 5 Uncalibrated Tonality Lists the effective dot area (EDA) of each ink and the targeted value
ColorFlow Reports Scenarios Troubleshooting ColorFlow Reports can help determine the cause of issues such as poor color match between press and proof Verification ColorFlow can report on the results of a calibration versus the target to determine the potential of a color match between output and expectations Optimization ColorFlow Reports can help determine the functioning state of a device and whether additional maintenance or different consumables are needed for optimum performance Analysis Use ColorFlow Reports to determine the consistency of a device or the ability of a device to hit a desired target Benchmarking ColorFlow Reports can be used to benchmark a device for future reference
41 Ink Optimizing
Ink Optimizing OptionCMYK ICC DeviceLink profile that1. Improves color stability on press during make-ready and production run2. Reduces ink consumption - more cheap black ink, less expensive CMY ink - overall less tons of ink used.3. Better and faster drying - less ink to penetrate the paper4. Prevents ink set offDetermine ink savings using Kodak Prinergy Virtual Proofing Software (VPS)Same visual appearance as the original image:1. Color match before/after2. Preserve smoothness and detail
Ink Optimizing OptionWill be part of ColorFlow v1.1Done by creating CMYK to CMYK ICC DeviceLinksApplied in Prinergy Refine or Final OutputDifferent tasks:1. Limiting Total Area Coverage (TAC)2. Applying Grey Component Replacement (GCR)3. Re-targeting: Sheetfed offset to Newspaper (after CF 1.1)4. A combination of the first 3 82
Ink Optimizing OptionApplied in Prinergy Refine or Final OutputDuring Refine:1. ICC DeviceLink will be applied during Refining2. InSite Prepress Portal and Kodak PressProof operator can measure the changed CMYK tints3. Proofs made with Ink Optimized data.During Final Output:1. ICC DeviceLink will be applied when outputting plates.2. InSite Prepress Portal user will not see the CMYK tint changes. Kodak PressProof operator can measure the changed CMYK tints.3. Proofs made with data that is not Ink Optimized date. 83
ColorFlow - Ink Optimizing OptionBefore Ink C M After with Kodak Ink C MOptimizing Optimizing SolutionSolution applied appliedCMYK Y K CMYK YK
Search
