your printer to produce the best possible color response. In simplest
terms, printer calibration adjusts the response of the printer so that a
specific data input value yields a specific color density output. When a
printer is properly calibrated, it generates the correct density for each
given data value. Calibration considers only a single primary color at a
time and measures the density for the primary color.
Density is one color aspect that can be easily and reliably measured, so
calibrating the Kodak Professional 8670 PS printer(8670 printer) is easy
and straightforward.
calibration utility (calibration utility) allows
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The calibration utility lets you select either a visual calibration process or
a more accurate densitometer calibration.
System Requirements
To use the calibration utility, your system must have the following
hardware and software:
Microsoft Windows for workgroups 3.11 or Windows 95 software
•
16 MB of RAM
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4 MB of hard disk space
•
color monitor
•
export module for the 8670 printer
•
densitometer if you will be doing the densitometer calibration
Minimum System Configuration
•
386 processor
•
MS-DOS version 5.0 or later
•
Microsoft Windows 3.1, Windows for workgroups 3.11, or Windows 95
software
•
8 MB of RAM
•
4 MB or hard disk space
•
standard color or black and white monitor (standard VGA; minimum
resolution 640 x 480 pixels)
NOTE: The export module software for Windows systems is included on
the software CD that came with your printer.
Installing the Software for the Calibration Utility
The software for the calibration utility and the export module are included
on the CD that came with your printer. Install the CD in the CD-ROM
drive, and use the browser to locate and install the software.
Before you use the calibration utility, you should be thoroughly familiar
with how to operate the printer. If you plan to use the densitometer
calibration, you should be familiar with densitometr y and how to operate
and calibrate your densitometer.
How Often To Calibrate
Calibrate your printer whenever the density or color balance of the prints
do not look correct. You may also want to calibrate your printer after it has
been serviced. Be sure that you calibrate for the correct media installed.
Calibrating your printer means calibrating the printing system—printer
and media.
Calibration Methods
The visual calibration components of the calibration utility include Easy
Cal, Visual Gray Balance, and Visual Linearity. While these methods do
not yield as accurate a result as a densitometer calibration, they can
make significant improvements in the consistency of results.
Easy Cal
Visual Gray Balance calibration. Ref
running an Easy Cal calibration.
—a five-step process to quickly calibrate your printer using the
neutral gray. Visual Gray Balance calibration ensures that the correct
percentages of cyan, magenta, and yellow dye are printed over the entire
tonal range to produce a neutral gray. Use the Visual Gray Balance
calibration if the color balance of your prints is not correct. Ref
“Visual Gray Balance” for instructions on running a Visual Gray Balance
calibration.
—calibrates your printer so that it produces a
er to
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Visual Linearity
darkness. Visual Linearity ensures that your printer produces an accurate
representation of the requested density values over the entire tonal
range. Use the Visual Linearity calibration if the color balance is correct,
but the density is too dark or light. Ref
instructions on running a Visual Linearity calibration.
—calibrates your printer for the correct lightness/
er to “Visual Linearity” for
Densitometer Calibration
A densitometer calibration calibrates your printer’s response based on the
densitometer reading for selected patches on a test print. Calibrating your
printer with a densitometer yields the most accurate calibration results for
color balance and density. Ref
instructions on running a Densitometer calibration.
The Easy Cal Step1of 5 dialog box appears. This dialog box allows
you to select the printer model you wish to calibrate and locate the
folder containing the expor t module.
1.
Select the printer from the Printer Model drop-down list.
NOTE: If the printer you want to calibrate does not appear on the menu,
you must locate and select the expor t module for that printer.
2.
Click on
3.
In the file selection box that appears, locate and open the folder that
contains the export module:
2. Enter the number of the most neutral grayscale cluster in the Cluster
Number text box.
NOTE: If you want to print an updated test print, you can click on
return to the Easy Cal Step 4 of 5 dialog box.
If cluster number 225 on the updated test print is the most neutral
gray, then the calibration is successful. Type 225 in the Cluster
Number text box, and go to Step 3 of this procedure.
NOTE: If the correct paper and ribbon do not appear, click on
Setup
Ref
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to change the paper and ribbon you wish to calibrate for.
er to “Selecting and Setting Up a Printer”.
Change
2. Select a starting point for the calibration document:
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Read Current Table from Printer
•
the starting point.
NOTE: The “Read Current Table from Printer” starting point is not
available with Windows systems.
Use Printer’s Default Table
•
Copy Table from File
•
calibration table. Click on
appears which allows you to find and open the folder that contains
the calibration table you want to use as the star ting point.
NOTE: For more infor mation on the Calibration Table dialog box, ref
If you have a densitometer, you can run just the Densitometer
calibration procedure. You do not need to do Visual Gray Balance and
Visual Linearity calibrations.
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NOTE: If you are using a black ribbon, you cannot use the Visual Gray
Balance calibration procedure. Go directly to the Visual Linearity
calibration procedure.
Using an Existing Calibration Table as the Starting
Point
Follow the steps below only if you have previously created and saved a
calibration table. If the table you select as a starting point does not
contain printer setup information, ref
2. Enter the information for the printer you are calibrating in the Printer
Description text box.
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3. Enter the information about the ribbon and paper you are calibrating
for in the Media Description text box.
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NOTE: Entries in the Printer Description and Media Descr iption text
boxes are optional and do not appear on the test print.
Calibrating Y our Printer
If you have a densitometer, you can run the Densitometer Calibration
procedure. If you run the Densitometer Calibration procedure, you do not
have to do Visual Gray Balance and Visual Linearity calibrations.
If you do not have a densitometer, you can calibrate your printer by
running the Visual Gray Balance or Visual Linearity Calibration
procedures.
Visual Gray Balance calibrates your printer so that it produces a neutral
gray. The calibration utility allows you to select from three Visual Gray
Balance calibration prints. Each of these prints presents 49 numbered
grayscale clusters. Each cluster is made up of four boxes of varying
densities. A Visual Gray Balance calibration print looks similar to the
following example:
The clusters on the three prints include a range of colors. Clusters in the
upper left corner have a green hue. Clusters in the lower right corner have
a magenta hue. Three different calibration prints allow you to choose the
degree of color shift.
Fine—offers the least degree of difference between clusters. This print is
useful when it is difficult to choose between clusters on the normal
calibration print.
For example, you printed a normal pr int and find that the most neutrallooking clusters are next to each other, but one still looks slightly green
while the other still looks slightly magenta. You can print a fine calibration
print to get more choices within a smaller range of colors.
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Normal—offers a moderate degree of difference between clusters. The
amount of correction in this print is appropriate for most calibration jobs.
Coarse—offers the greatest degree of difference in clusters. This print is
useful when neutral areas in prints appear very green or very magenta.
If the number of the cluster that appears to be the most neutral ends
in 25, the printer is already calibrated. Do a Visual Linear ity
calibration. If the number of the most neutral cluster does not end in
25, recalibrate your printer to the most neutral cluster number.
Input
6. Click on
The Input Test Print Values dialog box appears.
7. Enter the number of the most neutral cluster in the box.
The recomputed table is sent to the printer, and the following
message appears.
OK
11. Click on
.
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The calibration table is computed using the specified values, and you
return to the Calibration Document window. You should now perform a
Visual Linearity calibration.
NOTE: You should make another test print to verify your input value
Visual Linearity calibrates your printer so that it produces the correct
density. Use the
Reference Card (reference card) included with the calibration utility to
select a cluster for each of the six density ranges. Visual Linearity
calibration prints look similar to the following examples.
NOTE: For best results, do a Visual Gray Balance calibration before you
Use the reference card which comes with your printer to
perform Visual Linearity calibrations. The following steps
describe how to use the reference card:
1. Lay the reference card with the name at the top on the
first row of the calibration test print.
2. Slide the reference card across each path in the row,
and determine which of the nine patches in the row
most closely matches the darkness on the reference
card.
NOTE: It may not be possible to find a cluster in which all
six gray levels exactly match the reference card. Select the
cluster that is the closest match. Match the darkness on the
reference card and not the color.
3. Repeat Step 2 for each row on the calibration print.
After you have run a Visual Gray Balance calibration, run the Visual
Linearity calibration to recompute the current calibration table using
values from the test print.
1. Pull down the Calibration menu, and select “Visual Linearity”.
4. Click on Input in the Calibration Document window,
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The Input Test Print Values dialog box appears.
One, three, or four density value columns appear in the Input Test
Print Values dialog box depending upon the ribbon that is in the
printer.
5. Use the calibration utility reference card to select a box number.
If all of the Visual Linearity numbers on the test print are box number
5, the printer is already calibrated. If the Visual Linear ity numbers on
the test print are not all box number 5, you must recalibrate the
printer. Go to Step 6.
The Densitometer Calibration corrects the printer’s response based on a
densitometer reading for selected patches on a test print. If you have a
densitometer, you do not need to run Visual Gray Balance and Visual
Linearity calibrations. You only need to do a Densitometer Calibration.
With the Densitometer Calibration procedure, you make a test print and
measure the density values for each of the patches on the test print with
the densitometer. You then enter the density results for each of the
patches in the Densitometer Input Test Print Values dialog box.
The printer can print either a 15 or a 38-step test print. Using the 38-step
target yields the best calibration results; however, calibration time is
increased if you use a manual densitometer. The Densitometer
Calibration test prints look similar to the following examples depending on
the media you are calibrating for :
One, three, or four density value columns appear depending upon the
ribbon that is in the printer.
For manual densitometers only, valid characters in this dialog box
include numbers from 0 to 9 and decimal points. The valid range is 0
to 3.000. Move from cell to cell using the arrow keys. You can copy
and paste any group of contiguous fields in a rectangular pattern.
10. Type the test print values in the text boxes in the Input Test Print
Values dialog box.
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NOTE: You can impor t data from a densitometer automatically with an
import module. If your densitometer has an associated import
module, the densitometer readings are imported directly into the
dialog box. If your densitometer does not have an import module,
er to “Using the Kodak Digital Science File Reader.”
ref
11. Click on
The calibration table is computed using the specified values, and the
Calibration Document window appears.
Save—saves changes to the current calibration document. When you
name a calibration document, you may want to include characters that
indicate the selected paper types. Saving a document in this way allows
you to select it later to use as a starting point for a new calibration
document.
Save As—accesses a dialog box in which you can specify a new name
and location for the current calibration settings. When you name a
calibration document, you may want to include characters that indicate
the selected paper type. Naming a document in this way allows you to
select it later to use as a starting point for a calibration document.
Revert—returns a calibration document to its original state. All
recomputations are discarded.
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Preferences—accesses a dialog box that allows you to specify the folder
containing the export module and the folder containing the import
modules.
The Edit menu is enabled only when the Calibration Table window is open.
NOTE: The options in the Edit menu are enabled only when you enter
text in the Printer Description and Media Description boxes.
Calibration Menu
The Calibration menu is enabled when the Calibration Table window is
open. You can choose to calibrate based on your input to the Visual Gray
Balance, Visual Linearity, and Densitometer dialog boxes.
This dialog box allows you to specify the degree of correction to apply
with the current calibration table.
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Amount of Correction
Amount of Correction
The
difference between the neutrals in the calibration print:
Fine—the calibration print offers the least degree of difference in neutrals
between the cluster in the upper left corner and the cluster in the lower
right corner. The cluster in the upper left corner is only slightly green and
the cluster in the lower right corner is only slightly magenta.
Select Fine to get the smallest hue range. The hue differences between
clusters will be small so that you can fine-tune by choosing between
similar neutrals.
Normal—the calibration print offers a moderate degree of difference in
neutrals between the cluster in the upper left corner and the cluster in the
lower right corner. The cluster in the upper left corner is somewhat green
and the cluster in the lower right corner is somewhat magenta.
Select Normal to get a larger hue range than “Fine.” This means that the
hue differences between clusters are slightly larger and that adjacent
clusters are less similar.
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Coarse—the calibration print offers the greatest degree of difference in
neutrals between the cluster in the upper left corner and the cluster in the
lower right corner. The cluster in the upper left corner is distinctly green,
and the cluster in the lower right corner is distinctly magenta.
Select Coarse to get the largest hue range. This means that the hue
differences between clusters are easily discernible and adjacent clusters
are distinctly different.
NOTE: Make sure that your densitometer is calibrated before you try to
calibrate your printer with the densitometer values.
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Densitometer—This setting allows you to specify what type of density
data (Status A or Status T) your densitometer provides. The Calibration
Utility calculates the table data using the density type that the export
module needs for the current calibration slot.
Test Print — Number of Squares
The Number of Squares menu in the Test Print box allows you to specify
the number of squares (15 or 38) in your test print.
The Printer menu allows you to select a printer or set up the printer from
the menu bar.
Select Printer—a menu with the printer types that you can select from
appears. Selecting a printer type opens a dialog box that allows you to
choose the specific printer you wish to calibrate.
Printer Setup—the Printer Setup for Calibration dialog box appears so
that you can select the ribbon and paper installed in the printer.
Easy-Cal Menu
The Easy-Cal menu allows you to start the Easy Cal calibration procedure
from the menu bar.
Begin—the Easy Cal calibration procedure starts up.
Click on Change Setup to change the ribbon and paper settings.
Change Setup—accesses the Printer Setup for Calibration dialog box so
that you can select options that match the paper in the printer you are
calibrating.
The Starting Point box allows you to select the data that will act as a base
for the new calibration table.
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Read Current Table From Printer—allows you to retrieve and begin with
the table currently in the printer. After the table is loaded, you can edit it
and recalibrate the printer. This option is not always available as a
starting point.
NOTE: The Read Current Table From Printer is not available if the printer
cannot return this information. For example, many printers with a
parallel connection have this item deselected.
Use Printer’s Default Table—default data in the printer acts as the
starting point for the new calibration document.
Copy Table from File—the calibration table you select with the Select
File button acts as the starting point for the new calibration document.
The Calibration Document window allows you to specify information about
the calibration table.
Printer Description
The Printer Description text box allows you to enter information that
describes the printer you are calibrating. The text you enter is used to
describe the specifics of a particular calibration table. This text is not
printed on the test print. An entry is optional.
The Media Description text box allows you to enter information that
describes the paper and the ribbon for which the calibration table will be
used. The text you enter is used to help describe the specifics of a
particular calibration table. This text is not printed on the test print. An
entry is optional.
Calibration T ools
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Calibration Tools offers handling options for the calibration table.
Send & Print—sends the current calibration table to the printer. A
calibration print is generated so you can evaluate the results.
Input—accesses the Input Test Print Values dialog box so you can enter
visual gray balance, visual linearity, and densitometer data.
Send—sends the current calibration table to the printer without
generating a calibration print. This button is usually used after you have
created a test print and recomputed the calibration table.
The calibration utility includes the
that you can import data into the Input Test Print Values screen from a
densitometer. To use the file reader, you need the following software:
• a utility to capture the values from the densitometer. If software is not
provided with your densitometer, you may use a terminal program.
NOTE: The values from the densitometer should have no more than 3
decimal places.
• an application such as Microsoft Excel or SimpleText to save the data
as a text file.
The following steps describe how to use the file reader:
1. Create a document to capture the data from the densitometer. Be
sure to save the document as a text file.
2. Select "Kodak File Reader" from the Import Modules menu.