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  • DOCUMENTATION
  • Dashboard
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    • Support Download
  • INSTALLATION AND MAINTENANCE
  • Getting started with Coraye
  • Installation under Mac OS
  • Installation under Windows
  • Installation of the Windows driver for your spectrophotometer
  • Interface presentation
  • Plugins installation and management
  • Visualization modules
    • Gamut Viewer
    • Spectral viewer
  • Calibration
    • Create a profile from a standard reference
    • Customization of targets
    • Create a profil from a calibration
    • Printing chart RGB
    • How to use a ruler with a Xrite ColorMunki Photo or an Xrite I1 Studio
    • Create an icc profile from an average of measured charts
  • Colors Management
    • Capturing a color
    • Capturing a Light
    • Color finder module
    • Color converter module
    • Delta E Finder
    • Density
  • Colors tables
    • Colors tables
    • Example of using a color table with Photoshop
    • Create swatches containing reproducible colors in print
    • Create a color table from a spot color chart measurement
    • Export a Color Table to Wasatch RIP
    • Export a Color Table to EFI Fiery RIP
    • Export a Color Table to Onyx
    • Export to ColorGATE
    • Export a Color Table to Caldera RIP
    • Export a Color Table to Epson Edge Print RIP
    • Export a color table to the Roland Versaworks RIP
    • Export to Adobe Photoshop
    • Export to Adobe Illustrator
    • Export to Adobe Indesign
    • Import / Export a color table with the spectro densitometer XRite eXact
    • Convert color tables to make them printable
    • Reproduction report of colors contained in a table
    • Rename the colors of a table
    • Create a color chart
    • Prepare to print and cut a color chart
    • Prepare a color chart for metallic printing
  • QUALITY CONTROL
    • Print Control
    • Create a reference for Proof
    • Create a reference from a printed Mediawedge
    • Create a reference from a printed chart
    • Create a reference from the values of an imported range
    • Create a reference from a spot color swatch
    • Control a grayscale
  • First steps: Control of a standardized Mediawedge
  • Chart control
  • Compare and edit chart measures
  • Installation Problems
    • Plugin fail to install
  • Plugins
    • Barbieri
      • Barbieri LFP et LFP qb
      • Barbieri LFP qb Sensing Unit
      • Barbieri Spectropad
      • Gateway Barbieri
    • Konica Minolta CM-26
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On this page
  • 1. Prerequisites
  • 2. How to use Illum Reader
  • 3. How to manage yours Lights samples
  • 4. What are the values associated with the measured sample?
  • 5. Control your booth or your viewing condition
  • 6. Light measurement can be use to calculate an Icc profile.
  • 7. Show yours reflectance curves in the Spectral Viewer.

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  1. Colors Management

Capturing a Light

Illum Reader is a function to analyse the light.The purpose is to check the quality of your light into a viewing booths or in your viewing conditions.

PreviousCapturing a colorNextColor finder module

Last updated 4 years ago

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1. Prerequisites

This function needs a spectrophotometer to work (Konica Minolta MYIRO, XRite Eye One Pro 1, 2 or 3)

2. How to use Illum Reader

Click on the icon "Create Light" in the toolbar of Coraye

Make sure your spectrophotometer is connected. When the "Read target" window appears, click on "I'm ready".

A new window will appear to calibrate your spectrophotometer.

Put the spectrophotometer into the calibration position Then click on the Start calibration button.

Then click on the Start calibration button.

When the calibration is done, a new window will appear.

Be aware, you have to use the cap to read the light with the Konica Minolta MYIRO, I1 Pro 1, 2 & 3.

To capture the light, it is now sufficient to measure directly with the spectrophotometer. Successive measurements will be displayed one below the other.

You can make multiple measurements and rename them as you like.

When your measurements are finished, click on Save and quit. Yours lights samples will be add into the left column.

3. How to manage yours Lights samples

Click right on the color to Rename, Duplicate and Delete. Export option allow saving the color as a .sp file with spectral data. These .sp files are useful to share and backup yours light samples.

Measures can be export as a .sp file, to be saved on your hard drive.

4. What are the values associated with the measured sample?

To save your measure, click right on the measured light into the left bar, and select Export to save as a .sp file. As you see, you can also Rename, Duplicate or Delete the file when you click left on it.

5. Control your booth or your viewing condition

IllumReader can be useful to check uniformity, the color temperature and the light intensity into a booth, to check the conditions for viewing proofs, objects and prints. In the field of graphic arts, ISO standards have been defined to standardize the visualization conditions of prints. Knowing how to master one's light knows how to master one's color.

ISO 3664:2009 – VIEWING CONDITIONS Light source • Relative spectral power distribution must match CIE illuminant D50 • UV energy must meet CIE illuminant D50 (correlates to M1 within ISO 13655) Two levels of light intensity conditions • P1 Critical Comparison: e.g. two prints: illuminance 2000 ± 500 Lux • P2 Practical Appraisal: less critical comparisons e.g. hardcopy to softproof: 500 ± 125 Lux or exact illuminance adjustment of light booth to monitor Further definitions • Homogenity (Control over 9 zones in your booth) • Surrounding: neutral gray diffuse surface • Viewing angle to avoid glare

6. Light measurement can be use to calculate an Icc profile.

7. Show yours reflectance curves in the Spectral Viewer.

It could be useful to compare reflectance curves of your color sample with a spectral curve of a specific light to understand the metamerism effect.

When we read a light, we can get information like Ra, Brithness, Lab and x,y

The (CRI) is a method to determine how well a light source's illumination of eight sample patches compares to the illumination provided by a reference source. Cited together, the CRI and CCT give a numerical estimate of what reference (ideal) light source best approximates a particular artificial light, and what the difference is. CRI is a quality index for evaluating an illuminant. It is expressed as a percentage. the higher the value, the better the quality of the illuminant.

The color temperature of a light source is the of an ideal that radiates light of a color comparable to that of the light source. Color temperature is a characteristic of that has important applications in , , , , , , , and other fields. In practice, color temperature is meaningful only for light sources that do in fact correspond somewhat closely to the radiation of some black body, i.e., light in a range going from red to orange to yellow to to blueish white; it does not make sense to speak of the color temperature of, e.g., a green or a purple light. Color temperature is conventionally expressed in , using the symbol K, a for absolute temperature.

Color temperatures over 5000 K are called "cool colors" (bluish), while lower color temperatures (2700–3000 K) are called "warm colors" (yellowish). "Warm" in this context is an analogy to radiated heat flux of traditional rather than temperature. The spectral peak of warm-coloured light is closer to infrared, and most natural warm-coloured light sources emit significant infrared radiation. The fact that "warm" lighting in this sense actually has a "cooler" color temperature often leads to confusion.

If you need to display the spectral curve of your measured light, you can use the

CCT, CRI,
CIE
color rendering index
temperature
black-body radiator
visible light
lighting
photography
videography
publishing
manufacturing
astrophysics
horticulture
white
kelvins
unit of measure
incandescent lighting
[1]
Create a profile from a standard reference
Spectral Viewer
Spectral viewer
Calibration position
Standard viewing condition ISO 3664: 2009 P1
Standard viewing condition ISO 3664: 2009 P2