how g7™ makes inkjet color management better · how g7™ makes inkjet color management better...
TRANSCRIPT
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#COLOR19How G7™ Makes Inkjet
Color Management Better
Jim Raffel
Some slides have been adapted from others and are used with permission.
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About G7§ G7 is a known good print condition based upon gray balance
that takes the substrate white point into consideration.§ Gray is the one color we can say is right or wrong simply by
looking at it.§ Grays appear correct if they match the viewing environment's
white point (e.g. paper).§ http://idealliance.org/g7
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Known Good Print Condition
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What is Color Management?Controlled conversion between the color representations of:
§ Digital cameras§ Monitors§ Offset presses§ Wide format inkjet printers
The goal is to obtain a common visual appearance across the different devices and medias that are output.
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Color Management Visually
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What is an ICC profile?A look-up table that represents the color input or output of a given device.
The design is specified by the International Color Consortium (ICC).
We connect the devices in a Profile Connection Space (PCS).§ Occurs in L*a*b*
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Kinds of ICC Profiles
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Kinds of ProfilesCanned Profiles
§ Consider the source.§ Match your printer, media and ink?§ Ink restrictions for your environment?§ For color critical work, it leaves a lot to be desired.§ But it’s cost effective and quick.
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Kinds of ProfilesCustom Profiles
§ You are the source (or you hired a color management expert).§ Perfect match for your printer, media and ink.§ Ink restrictions tweaked for your environment – maximized gamut.§ Perfect for color critical work.§ But it’s not free and takes time.
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Kinds of ICC Profiles
Canned Custom
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Why Bother?
Color is about evoking a feeling from you - the potential consumer -of a product or service.
Sometimes those feelings are good and sometimes those feelings are bad. At other times, the feelings are neutral.
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The Touchy, Feeling Side of ColorDesigners could care less if we hit the right L*a*b* values within the specified Delta E tolerance range.
What designers care about is walking up to the product on the store shelf and feeling the way they intended us to feel.
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The Touchy, Feeling Side of ColorDesigners care about what we do.
They just don’t want to know how we do it.
Our deliverable to them is the right color every time, all the time.
Accurate, and Precise
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The Starbucks QuizImagine walking through the door of a Starbucks – any Starbucks in any city. To enter, you have to open the door with the circular sign that signifies a Starbucks. You open the door and you see the familiar tables and chairs and the rack of Starbucks coffee and mugs for sale leading to the counter. Maybe this particular Starbucks is grand enough to have a fire burning in a fireplace in the middle of the store. There’s a buzz in the air of people meeting and talking about important things. You can smell the fresh-roasted coffee and sweet caramel mocha lattes being made to order.
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The Starbucks QuizAre you there? Can you hear it, smell it, feel it?
Good. Now I have two questions for you:
What color is that circular sign on the door you walked through?
What symbol or image is in the middle of that sign?
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The Starbucks Quiz
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Color Perception
Color results from an interaction between, light, object and the observer. It is light that has been modified by an object in such a manner that the observer (human visual system) perceives the modified light as a distinct color.
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How Many Colors Are There?
The average human eye can see millions of colors!
An RGB monitor can typically reproduce around 16.8 million colors.
A typical CMYK printing device can reproduce thousands of differentcolors depending on calibration and dot structure or halftone used.
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Defining Color-Additive Color Model
RGB - When two additive primaries overlap, a subtractive primary is produced.
Where all three are combined, white light is produced.
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CMYK Color Space - SubtractiveSubtractive color system: § Equal portions of cyan, magenta and yellow subtract color from the
viewer’s eye to produce black. Additional black ink or toner is used to create a more true black tone.
CMYK colors are used by: § Wide format printers, copiers and
full-color printing presses
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Additive vs. Subtractive Models
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3D Color Space
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GamutGamut refers to the range of color that a device can capture (camera or scanner), or reproduce (monitor, proofing system, or printing process). Every device will have its own unique gamut.
2D and 3D Gamut Map: Outside shape is AdobeRGB (1998) – shape in middle is GRACol2013 CRPC6
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Gamut Conversion Color workflows work from larger gamut input devices to a smaller gamut output device
RGB? – CMYK?
Rendering intents translate the differences
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Rendering Intents-PerceptualPerceptual rendering intent
Compresses all colors (detail) into the destination space while trying to preserve color appearance and color relationships. It does this by adjusting all of the colors –even those that were in gamut. This causes more colors to shift than any other rendering intent.
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Relative ColorimetricRelative Colorimetric Rendering Intent
1 to 1 matching of in-gamut colors. Out of gamut colors are clipped to nearest reproducible hue. Relative colorimetric causes the white in the source space to be re-mapped to the white point of the destination space.
All colors maintain relative position to the white point.
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Color Management Pyramid
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Color Management Pyramid
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Stabilize the System
Color Management Pyramid
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Stabilize The System§ Ambient / Environmental Conditions.
- Temperature- Humidity- Static Electricity- Electrical Power Issues- Dust/Dirt, Etc.
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Environment - Problems
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Environment - Better
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Stabilize The SystemCalibrating Media to Printer§ Head Height§ Nozzles§ Uni/Bi Directional Alignment§ Media Feed Adjustment§ Heat/Cure Settings
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Stabilize The SystemRIP Settings§ Dot Pattern§ Resolution§ Pass Count§ Print Speed§ Overprint/2nd Strike§ Variable Dot Settings§ Light Ink Transitions
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Profiles and Rendering IntentInput Profiles
a/k/a Source ProfileDefines the target color space(s)
Honor Embedded Profiles?Trust the file provider or not.
Rendering intent(s)Changes overall color rendition
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Color Management Visually
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Remember Rendering Intents?
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Profile Creation G7 happens
here
Color Management Pyramid
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Inkjet is Different.At some point on the uncalibrated tone ramps, each primary color stops being the color we expect it to be (ISO 12647-2) in conventional printing and becomes some other color.
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How We Solve This DifferenceProperly setting primary (or single channel) ink restrictions is the single most important aspect of creating inkjet profiles.
This is particularly challenging with solvent, dye sublimation and UV.
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What an ISO Compliant Ink Looks LikeReaches the target delta-E ellipses via a fairly linear and predictable path.This graph is the end result of a properly ink restricted and profiled aqueous printer that passed G7 Color Space certification.
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Where We Run into Problems…Notice cyan coming up short.And a hooked magenta.Then, see what happens to red as a result of a hooked magenta.AND this is after proper ink restrictions and profiling.
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One more look: side-by-side
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Sounds Like it Might be Hopeless
At this point you might be asking yourself, why bother?
Sounds like it can’t work or that it’s very difficult.
But it’s not and it does work.
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Profile Creation G7 happens
here
Color Management Pyramid
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Print, Measure, Calculate
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RIP Linearization
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RIP Linearization/G7 Calibration
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Why Does it Work?Because G7 is a process-based solution to achieve near neutral or gray balance of CMYK devices.
G7 is not a shiny thing or a quick fix for all your color problems.
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Known Good Print Condition
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Profile Creation G7 happens
here
Color Management Pyramid
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Total Area Coverage (T.A.C.)
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Set The T.A.C.
A: Do gradient patches maintain different color?B: Are small characters clear?C: Are patch boundaries clear?
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Profile
T.A.C.
Linearization
Primary Ink Restrictions
RIP Settings
Calibrating Media to Printer
Ambient / Environmental Conditions
Profile Creation G7 happens
here
Color Management Pyramid
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Print and Measure ICC Target
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ICC Profile Creation Options
1.Maximum total area coverage.
2.Maximum Black only coverage.
3.Black ink starting point.4.Black ink curve (GCR)
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1 FacilityUV, Aqueous, & SolventPaper, PVC, Banner, and VinylCertified G7 Master Printer for Color Space and Gray Scale
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Understand The Color TargetsWhat is the target?§ CRPC?
Have a plan to get to the select color target(s)§ The right software and instruments
Verify the process§ If it’s not repeatable, color management will be difficult or even impossible
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Accuracy vs PrecisionAccurate,
but not Precise
Accurate, and
Precise
Precise, but not
Accurate
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Hitting Industry Specifications: Accurate and Precise
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A Picture is Worth 1000 Words
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Caution: Spot ColorsCMYK verification does not ensure that spot colors will match. That is why most RIPs include spot color replacement and matching tools.Verify spots separately.
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G7 DeliveredDye subMentalAnd ceramic