Appendix C
0
Using Genlin
Genlin is a utility provided with the Harlequin RIP to read calibration targets generated by the RIP.
C.1 Introduction
Genlin supports these measuring instruments:
• X-Rite 408
• X-Rite DTP41 series
• X-Rite DTP32
• X-Rite DTP34
• X-Rite DTP12
• X-Rite 938
• Gretag Macbeth Eye-One
The remaining sections show how to set up and use Genlin, and how to troubleshoot any problems.
• “Using Genlin” on page 413 describes set up and use
• “Troubleshooting” on page 417 describes troubleshooting
C.2 Using Genlin
The use of Genlin involves these stages:
• “Starting a work session with Genlin” on page 414. This section describes the connec-
tions and checks to make before you start measuring targets.
• “Measuring each target” on page 414. This section describes the steps involved in
using Genlin to measure a target.
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C.2.1 Starting a work session with Genlin
Follow these steps to start a session using Genlin:
1. Connect your measuring instrument to the computer via USB, or using a USB to serial adapter cable.
Note: USB support is available for the Eye-One, DTP41, and DTP34 devices. If you need to connect to a serial device, use a USB to serial adapter cable. One example is the
Keyspan USA-28X USB twin serial adapter. With this adapter, ensure that you set the
Port
in the Configuration dialog box to the name of the device, as set up by the adapter.
Note: When using the Eye-One device, you must choose
Custom from the
Port
menu in the Configuration dialog box. This is because Genlin communicates with the device via third-party software.
2. If necessary, recalibrate the measuring instrument using the correct calibration plaque or other white reference tool.
You should calibrate the first time you use an instrument with Genlin, or whenever you change measuring instruments. You should also recalibrate the measuring instrument after periods of storage or heavy use.
Note: When using the Eye-One device, Genlin sends a request to the spectrophotometer to calibrate itself so that Genlin can accurately read a new target. This means that you must place the Eye-One device on its holder, which contains a built-in white reference, whenever you begin the process of reading a target. Otherwise, Genlin will display a
Calibration failed...
error message when trying to read the target, as
described on page 418.
3. Start Genlin by opening the application file located in the Harlequin RIP application folder.
C.2.2 Measuring each target
Note: This procedure assumes that you printed an uncalibrated target.
Follow these steps to measure a target using Genlin:
1. Choose
File > Configure
to display the Configuration dialog box, as shown in Figure C.1
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Figure C.1 Configuration dialog box
Select your desired settings, as explained here, and then click
OK
.
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RIP Folder
Instrument
Measure
Identifies the
SW folder of the RIP installation that you are using to print targets and import data.
You can read targets that have been created by the RIP running on another computer if you have network access to the corresponding
SW folder. If you want to do this, click
Browse
and use the file browser to select the
SW folder of the remote the RIP installation.
The default is the relative path to the
SW folder of the the RIP with
which Genlin is supplied (as shown in Figure C.1).
A list of supported measuring instruments. Choose your desired measuring instrument and ensure that the correct
Port
setting is selected.
Measurement types supported by your chosen measuring instrument.
Choose a suitable measurement type.
Media
A list of types of media that targets are printed on, including press and imagesetter media. Choose the type of media that your target is printed on. For example, choose
Press Paper when using a proofing printer.
Port
A list of the interface ports available on your computer. Choose the port to which your measuring instrument is connected.
2. Choose
File > Read Target
, select the number of the target that you are reading (printed as
Reference Number: N on the target) and click
OK
.
3. In the Read Target dialog box, choose which channels you wish to measure, as well as the filter type and measurement type that you wish to use.
Figure C.2 Read Target dialog box
To do this, select the channel you wish to edit and choose
Yes or
No from the menu below the
Read?
column. If both your measuring instrument and target support more than one measurement system you may also have a choice of alternative filters and measurement types in the menu below the
Measure As
column. For example, choose
Cyan % Dot
, then click
Read
. See “Values” on page 351 for details of measurement
types.
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4. Measure the target by referring to the details for your type of measuring instrument. If
you have repeated problems reading a patch or strip see “Troubleshooting” on page
417.
In particular, you must follow the screen prompts to measure the target. Note that when using the DTP32 and DTP34 devices you must click
OK
in the Confirm to proceed dialog before loading the target. For DTP41 devices, you should click
OK
after
inserting the target.
Strip-readers and other semi-automatic instruments
Ensure that you scan the target in the right direction. When reading strips, the instrument should be positioned so that approximately an inch of blank paper is available at the end of each strip. Try to avoid any marks outside the area of the patches, such as the strip numbers.
You may see a
Bad reading message appear if the instrument has been unable to correctly measure the strip: if so, click
OK
. If you wish to retry reading the strip, click
Yes
, align the strip with the instrument and click
OK
. Click
No
if you wish to abandon measuring the target.
Manual instruments
Follow the screen prompts to measure the target. If you are using a manual instrument such as the X-Rite 938 you will also see prompts in the display panel of the instrument to read individual patches within strips. For example, the prompt
Move to: C100 means read the 100%
Cyan patch.
Choose
File > Abort Target
if you wish to abandon reading a target.
5. Click
OK
when you have finished measuring the target.
At this point, Genlin has created a data file containing all the linearization data for the target, which you can import into the RIP. (The file is named import and is located in the caldata folder within the RIP’s
SW folder.)
6. Use the menu option
Output > Calibration Manager
and, in the Calibration Manager, choose the appropriate
Device
and
Color Space
for the target. (See “Calibration Manager dialog box” on page 343 for details of the Calibration Manager.)
7. The next action depends on whether you are updating an existing calibration set or creating a new one. Choose the appropriate action:
• If you are updating an existing calibration set, select it in the table listing. This
must be the calibration set that you used to print the target. Click
Edit from uncalibrated target
. The Edit Calibration dialog box appears. Go to step 8.
• Click
New
if you are creating a new calibration set. Then, if there are entries in the
Profile
menu in the Edit Calibration dialog box, choose the supplied calibration profile that you used to print the target. Enter a
Name
for the new calibration set.
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You can use the same name as the supplied calibration profile, but omitting the enclosing parentheses—
( )
—that supplied calibration profiles use; this makes the link between the two profiles more obvious.
8. Click
Import
; see the description on page 352 for more details. After importing the data
and making any other settings, exit the Edit Calibration dialog box and Calibration
Manager by clicking
OK
.
Warning: You must read the values from the data file (or copy the data file to another location) before measuring another target for the same RIP installation. Genlin uses the same file name for every data file so any existing measured data is lost when you measure a new target.
Start again from “Measuring each target” on page 414 to read another target.
Note: If you no longer need to measure any of the targets that you have printed using the
RIP, you can choose
File > Purge
. This means that the numbering of targets can restart from
1
.
C.3 Troubleshooting
This is a list of some possible error messages and symptoms that you may see, together with suggestions for avoiding them.
C.3.1 Error messages
All error messages are preceded by the details of the measuring instrument. For example, you might see this full message when there is a problem with an X-Rite 938 instrument:
X-Rite 938 Error: No responding device attached to selected serial line
Error: The USB device cannot be found
This message appears if Genlin is unable to locate the chosen USB device. Ensure the measuring device is connected to the USB port and is powered on. Ensure also that you have selected the correct
Instrument
and
Port
in the Configuration dialog box.
Error: No responding device attached to selected serial line
Error: The USB device is not responding
Either of these messages may appear if the measuring instrument does not have any power supply. Check the power supply to the measuring instrument and ensure that it is switched on. If the problem persists there may be a fault with the power adapter or cabling.
Error: Number samples received, but Number expected
This message appears if the Eye-One software was unable to correctly detect the boundaries of each of the patches on the calibration target. That is, the number of patches read does not match the number of patches expected. You may have scanned the calibration target too quickly or confused the software by scanning part of the number at the top of a strip, and so on.
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When reading strips, the guide should be positioned so that approximately an inch of blank paper is available at the end of each strip. Try to avoid any marks outside the area of the patches, such as the strip numbers.
Error: Calibration failed - place the device on its white reference and start again
This message may appear when calibrating the Gretag Macbeth Eye-One spectrophotometer. You must place the Eye-One device on its holder, which contains a built-in white reference, whenever you begin the process of reading a target. This allows
Genlin to accurately read the target. Refer to the documentation accompanying this device for further details.
Error: Unknown
This message may appear if you have used the
File > Abort Target
menu option. This message may also appear if the RIP is unable to recognize the error generated by your measuring instrument. Check any display panel on a manual instrument for more details.
In all cases, you will be asked whether you wish to re-try measuring the target. If the error persists, consider recalibrating the measuring instrument or following advice in
the “Symptoms” section.
C.3.2 Symptoms
Failure to communicate with the measuring instrument
This may be due to a mismatch between configuration settings and the actual instrument or interface port used. A break in cabling, or a failure in software between the computer and the measuring instrument may also be the cause of a communication failure. Check the connections and settings in the Configuration dialog box. If these appear to be correct, try switching off or disconnecting the measuring instrument for
30 seconds and then reconnecting it.
Alternatively, Genlin may not be able to communicate with the measuring instrument due to the re-configuration of the interface port by another application. If you think this is the case, close the application that you suspect is causing the conflict. If necessary, shut down and restart your computer.
Failure to read the correct data from the target
A problem in this area is most likely to be a mismatch between the Target file selected in Genlin and the type of target you are physically measuring. First make sure that the number you select in the target list after clicking
File > Read Target
matches the reference number printed on the target itself.
If recalibrating, you may have printed the target on the wrong paper type. Otherwise, you may have read the wrong patches when using a manual instrument, or incorrectly aligned the target when using a strip-reader. Finally, the target may be incorrectly printed or the measuring instrument may need recalibration.
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Failure to transfer correct data to the RIP
Ensure that the
RIP Folder
specified in the Configuration dialog box is the path to the
SW folder of the RIP installation into which you are importing data.
If the
RIP Folder
is correct, this problem may be due to a problem with the content of the caldata folder where target and import data is stored. This is very unlikely event but if it happens, delete the caldata folder, which is a subfolder of the Harlequin RIP
SW folder and print the target again.
Note: After deleting the caldata folder you cannot use Genlin to read targets created before you deleted the folder—you must reprint the targets.
The reference number printed on the target does not appear in the list when you click
File > Read Target
This can happen if the target was printed using a different Harlequin RIP installation.
Ensure that the
RIP Folder
setting in the Configuration dialog box is the correct path to the
SW folder of the RIP installation used to print the target.
This can also happen because the caldata folder was deleted between printing the file and trying to read it with Genlin—reprint the target and measure the new print.
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