Setting The Color Difference Tolerance - Konica Minolta CR-400 Instruction Manual

Optional Setting
<Setting the Color Difference Tolerance>
This instrument can make judgments based on a color difference tolerance for the measurement value
of the color difference target color.
When measuring color difference, if the measured value is within the color difference tolerance set for
the color difference target color, "PASS" is displayed, if it is at the warning level "WARN", and if it is
out of the range "FAIL" is displayed is displayed. It is possible to judge whether the data is close to the
tolerance by setting an appropriate warning level (i.e. what percent of the tolerance). If the buzzer is
set to ON, an error beep sounds when the judgment is "FAIL".
The four methods for setting the color difference tolerance for judgment are shown below.
1) Elliptical tolerance:
2) Box tolerance:
3) ∆E:
4) Box tolerance and ∆E:
"O" is displayed if no tolerance is set.
It is possible to set various color difference tolerance for one set of color difference target color data.
However, the following restrictions apply to the type of color difference tolerance which can be set
depending on the color space.
See P.80 "Color Space and Color Difference Setting" for details.
• None of the color difference tolerance above (1 - 4) can be set for "Munsell" or "User Index."
• Only 2 above can be set for "CIE WI/Tw", "WI E313", "YI D1925", and "YI E313".
∆E in 3) and 4) above is displayed as follows depending on the set color space.
∆E*, ∆E, ∆E94, ∆E99, ∆E00, CMC
Even if the color space is changed after the color difference tolerance is set, it is managed using the
color space present when the tolerance was set. Therefore, judgment is made on the measurement
values calculated internally on the basis of the color space at the time the tolerance was set, and not the
color space selected in the measurement screen. Further, the color space systems at time of setting are
used for redisplaying the existing tolerance and input rules when changing settings.
It is not possible to input a tolerance for only one component. (for Ex. L* only) In this case, set a large
tolerance for the other components.
Although it is possible to change the type or value of the tolerance after the color difference tolerance
is set, it is impossible to cancel it. To cancel the color difference tolerance, it is necessary to either
select a color difference target color for which a tolerance has not been set or delete the color differ-
ence target color for which the tolerance has been set.
The following description uses the "L*a*b*" color space for example.
The input ranges for the set values are as follows.
(Tolerance)
(Offset)
(Rotation)
(Warning level)
Do not enter "space" for color difference tolerance. If you enter "space", it will be processed
as a numeric value "0". For example, if you enter 5_.00 ("_" means "space") by mistake,
though you intended to enter 5.00, the setting value will be 50.00 against your intention.
The sample displays used for the following descriptions are the ones when L*a*b* is selected as the color space.
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allows setting a tolerance on the basis of an ellipse. This makes it
possible to display the color difference in results closer to what is
visible to the naked eye.
allows setting a tolerance independently for each component like "L*", "a*",
"b*", etc. This type is easy to understand and makes calculation easy, too.
allows setting a tolerance based on the color difference (∆E) with the
target color.
allows setting a tolerance combining (2) and (3) above.
Y: 0.01 to 99.99, xy: 0.0001 to 0.9999, other than Yxy: 0.05 to 80.00
-5.00 to +5.00 (should be within tolerance)
-45 to +45
10 to 100%