Canon iPF8000S - imagePROGRAF Color Inkjet Printer, Questions And Answers, Page: 13 / 36

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was used.
(3) After sufficient drying, colors of both printed calibration charts were measured using a
spectrophotometer, at a temperature of 23 ° C and relative humidity of 65%. The average
∆ E (
Δ
E2000) was calculated between corresponding patches on the two calibration
charts.
Q. When should color calibration be performed?
After initial installation and print head replacement. It can also be performed after printing for
some time if users sense a difference in the appearance of colors.
Q. About how long does color calibration take?
Approximately 10 minutes.
Q. What is ∆ E2000?
∆ E is a standard endorsed by the International Commission on Illumination (CIE) for
quantification of the difference between two colors. It is defined using ∆ L*, ∆ a*, and ∆ b*, the
difference between coordinates L*, a*, and b* in the CIELAB color space. First promoted by CIE in
1976, the standard has been refined over time. The standard initially published in 1976 is known
as
∆ E76, and in 1994, the difference between colors in a wide color gamut was refined to be more
in line with the human sense of vision. This standard was called ∆ E94. 2000 saw the release of an
improved standard, ∆ E2000, which addressed the difference between subtle visual perception
and color discrepancies. The ∆ E2000 standard is used to express the precision of color calibration
in the iPF8000S and iPF9000S.
Q. Can you describe this calibration chart used with your proprietary measurement method?
This is a chart comprising 729 color patches, enough to reproduce the full printer gamut and
enable evaluation of color discrepancies.
Q. Which printers would you say offer better color calibration precision, yours or HP's?
The color calibration precision of these printers is nearly equivalent.
Q. What sets color calibration of the iPF8000S and iPF9000S apart?
Result from performing color calibration on just one type of media is applied to all media in all
printing modes. When a color calibration is performed for one type of media, calibrations for all
media in all printing modes are achieved according to the result data derived from the one
calibration.