General Questions

Is there an integrated help function available in GMG ColorProof?

Yes, you can access the help at any time by pressing the F1 key. This will automatically open the right chapter about the section you are currently working in. As an alternative to the F1 key, you can also click Help > Show help... in the program menu.

Can I use different user roles in GMG ColorProof?

Yes, you can. GMG ColorProof can be used either in user mode with restricted permissions or in administrator mode with full access. Further information on both modes and how to switch between them can be found under the following links: Switching the User and Password Protection

Why is my job not being processed?

There can be several reasons for this issue. Most often, the error cause can be found in the printer calibration, the hotfolder content, the services, or the PDF file itself.

Can I print my proof together with my company logo or other custom data automatically?

Yes, this is possible. To achieve this, insert the desired data such as logos, static information, and text into a single image file. Then define the file as control strip and select it in your workflow properties.

Where can I find a summary of my processed jobs?

In GMG ColorProof, you have two options for creating a history of your finished jobs: manually or automatically. The automatic job report option is disabled by default.

What is the definition of "multicolor"?

In a multicolor workflow, the standard CMYK ink set is extended with additional colors, thus enhancing the color space. Especially the 7-ink combination CMYK + OGV, i.e. the additional use of orange, green, and violet, can be very beneficial. With these seven inks, you can cover a very wide range of spot colors without changing inks on the press.

Download & Installation

Where can I find the latest GMG ColorProof version?

You can find the current version in our download center under https://gmgcolor.com/support/download/product/colorproof/.

Where can I find the GMG ColorProof manual?

During the installation, the user guide is saved as a PDF file in your GMG ColorProof folder automatically. You can also download the manual as well as further documentation from our tutorial page under the following link: Tutorials

What should I consider for installation and configuration?

Make sure that you run the installation as a user with administrator rights. Also deactivate your firewall and anti-virus program. If you do not want to deactivate both, please setup special exception rules. This will be necessary for the normal operation.

How can I uninstall GMG ColorProof completely?

By following the steps below, you can remove GMG ColorProof and all its components. This also includes configuration files such as proof standards, workflow definitions, calibrations, and profiles. If you would like to install and use GMG ColorProof later again, we recommend you to create an environment backup before uninstalling.


What is the best way to store my GMG media and proofs?

Protect your media and proofs especially from direct sunlight, extreme temperature variations, moisture, and contact with chemicals. It would be best to store your proofs individually in protective sleeves.

What should I take care of while handling my GMG media and proofs?

Avoid stains, scratches, creases, and direct contact with chemicals. After use, ideally restore media proofs according to our storage recommendations.

What is the shelf life of my GMG media?

By following our storing recommendations, a shelf life of up to two years can be achieved.

Where can I find further information on the GMG media portfolio, e.g. certificates?

On our website at https://gmgcolor.com/products/proofmedia/, you can find an overview of our media range. There you can also find a download area for specific information, such as certifications.

Whom can I contact if my media roll is defective?

We attach great importance to the highest quality of our in-house substrates. If you should have any complaint about a GMG medium, please contact one of our sales channel partners. They will handle the complaint for you and arrange a replacement. In addition to our own media, you can also purchase substrates from our official media partner JetComp via us. If you have any questions or feedback about these media, please contact JetComp directly. This is the fastest way to get competent feedback on your individual request.

Can I deactivate the paper tint simulation?

Yes, you can deactivate this option in the print settings of the job or workflow. Please note, however, that your printouts without paper tint simulation will no longer meet the requirements of a contract proof and thus will be marked with a corresponding note in the caption line.


Why does my printer calibration not start?

If your printer does not print although you have started a calibration, this can have several causes.

What can I do if my calibration fails?

If a calibration fails, the error may be caused by the printer itself, the inks, or the inserted medium.


Can I verify spot colors with GMG ProofControl / GMG ProofControl Inline?

Yes, spot colors can be verified. As with pure CMYK ink sets, this is done based on previously measured and thus fixed defined color values.

Why does the spot color on my proof differ visually from the Pantone® color guide?

Printed Pantone® color guides, like all printed products, are subjects to production fluctuations and age-related color changes. They are thus not a reliable reference for comparison.

What is GMG ProofControl Inline?

With GMG ProofControl Inline, your control strips are fully automatically verified by your internal measuring device immediately after printing. This additional option for GMG ColorProof is chargeable, licenses can be requested from our sales channel partners. Further information on GMG ProofControl Inline can be found under the following link: Proof Verification.

Why does GMG ProofControl Inline not print a label on the proof?

In order for the verification to be printed out automatically, the setting for automated label printing must be activated in GMG ColorProof. Your printer's internal measuring device must be selected in the job and workflow properties.

Can I use GMG ProofControl Inline with my own custom proof standard?

Yes, you can. To do so, link your proof standard in GMG ColorProof to the corresponding GMG ProofControl standard. If a corresponding print standard is not listed yet, it can be created automatically as part of the linking process.

How can I create a GMG ProofControl standard for my own custom proof standard?

You can have a GMG ProofControl standard generated automatically by using the Generate From Proof Standard feature. The calculation is based on the target values in the profile and according to ISO 12647-7:2016.


Should I connect my printer via USB or the network?

We recommend connecting via a TCP / IP network connection. Compared to a USB connection, it offers the advantage of always reporting the correct printer status to GMG ColorProof and thus, possible hardware problems can be solved faster. This is also the only connection type allowing direct control of internal measuring devices.

Which ports and URLs are used by GMG ColorProof?

An overview of the ports and URLs used can be found on our website under the following link:  (see "Ports and URLs")

How can I use hotfolders from my workspace?

This is possible if the relevant hotfolder directories are shared via the network. It is important that the sharing settings allow read and write access. Please contact your IT administrator in this matter.

Backup & Restore

Should I create a backup of my installation?

We recommend you to backup regularly, as this will allow your system to be restored in case of emergency. If required, a backup can also be used for migrating your installation to another system.

How do I create a backup?

GMG ColorProof provides an integrated backup function that allows you to manually backup your system if necessary. You can find it in the program menu under System > Environment Backup > Create....

How do I create an automatic backup on a regular basis?

GMG ColorProof provides an integrated Environment Backup Scheduler that allows you to automatically backup your system at defined intervals. You can find this function in the program menu under System > General.

How do I restore my system from a backup?

GMG ColorProof provides an integrated restore function that allows you to easily restore your system from a backup file. You can find this function in the program menu under System > Environment Backup > Restore....

GMG ColorProof GO

Can I share the job monitoring with other users?

Yes, this is possible. Use the integrated invite function of GMG ColorProof GO to invite other users by e-mail to your desired instance. Thus, each user receives their own login for job monitoring.

Where can I view and change the permissions for individual users?

Click on the gear icon in the upper right corner of GMG ColorProof GO and select Users. Under Role. You can then view the status of the individual users and change it if necessary.

How can I delete a user from my system administration?

In the settings, you can withdraw a user's access authorization for single or all systems. After logging in to their GMG ColorProof GO account, this user will no longer be able to view your instances, nor will they appear in your overview.

Why is a user displayed grayed out in my overview?

This is the case if the user has never before logged into the particular instance next to which their name appears in gray. Please make sure that they have received the e-mail invitation and followed the steps listed in it. Please also consider a possible spam folder.

Why does a user appear more than once in my overview?

This is the case if this user has been granted access to more than one connected GMG ColorProof system. In the user overview under User, their ID is then listed multiples times, but under Site Access, a different GMG ColorProof system is listed in each case.

Can I monitor several GMG ColorProof GO instances at the same time?

Yes, this is possible if you register with the same e-mail address for all relevant instances. To do this, use the invitation function in GMG ColorProof GO under Menu (gear icon) > Users > Invite User. If you are then logged in with this e-mail address, you can monitor all the relevant instances simultaneously.

Why does GMG ColorProof GO not connect to GMG ColorProof?

Please make sure that you have a license for GMG ColorProof GO. A Software Update Contract (SUC) is required for this.

Why do I not see any jobs even though GMG ColorProof is connected?

This may be due to incorrect time and date settings on your Windows system. Please check them and make corrections if necessary.

GMG DotProof

What is GMG DotProof?

With GMG DotProof, you can create color accurate halftone proofs. In addition to the color appearance, the dots of the printing screen are also simulated here so that unwanted effects, e.g. moiré, can be avoided in the final print. Data processing errors in the CtP RIP can also be detected at an early stage, as GMG DotProof can use the same 1-bit files that are used for exposing the printing plates. You can find further information in our information brochure.

What is a 1-Bit TIFF (.tif)?

A 1-Bit TIFF is one of always several color separation image files. Each of these files contain the screening information for only one single color. Thus, for example, there are four individual 1-Bit TIFF files for a four-color job. In combination, all the individual color separation image files result in the final output image. You can find further information on this topic under Separated Multi-File Images (1 Bit).

How can I use GMG DotProof with 1-Bit files from the CtP-RIP?

For this, you need a GMG medium and a proof standard that contains an MX5 or MXD profile. If you do not have such a profile yet, you can create it with GMG ProfileEditor or GMG OpenColor in a few steps. The important thing here is that the screening data from the profile exactly matches that from the 1-Bit files.

Can I use GMG DotProof without 1-Bit TIFF files from the CtP-RIP?

We recommend you to use the original 1-Bit files from the CtP-RIP. If these are not available to you, you can alternatively have 1-Bit TIFF files created from your PDF or PS file using GMG 1-Bit Creator. Please note, however, that the halftone shape and angle arrangement may differ from the actual exposure result in this case.

GMG ProfileEditor

Can I create a high-resolution ICC profile from an MX4 file?

No, but you can use the GMG ProfileEditor to export the target values and actual values into a CGATS text file instead. This file can then be used in common ICC profiling solutions as a basis for profile calculation.

Printers General

Why should I adjust the paper feed?

The paper feed behavior may differ from the ideal setting due to manufacture tolerances and wear. In the final print, this can lead to unwanted results affecting the measured color values. The automatic GMG paper feed adjustment detects hardware irregularities and compensates for them by adjusting the paper feed settings exactly according to the individual conditions. This ensures a high print quality at all times.

How can I adjust the paper feed?

For Epson printers with only one print head and internal measurement device ILS30, we recommend the automatic paper feed adjustment. Please click the following link for detailed instructions: Automatic Paper Feed Adjustment. If your printer does not have an internal ILS30 unit or is equipped with two print heads, it is possible to adjust the paper feed manually as described under the following link: Manual Paper Feed Adjustment.

When should I adjust the paper feed?

In order to ensure optimum print quality, we recommend the paper feed adjustment in the following cases:
  • when setting up a printer for the first time
  • when using a new media type for the first time
  • in case of calibration issues
  • in case of exceeding tolerances despite successful printer calibration

Can I use my custom profile for several printers?

To ensure highly accurate color images, each profile is made to match a specific combination of device type, media, and print mode. Thus, a profile can only be used for other printers under certain conditions.

Which printers are compatible for remote proofing?

Different printers can only be used in a common remote proofing workflow if they belong to the same device group.

Epson Stylus Pro 4900 / 7900 / 9900

How do I prepare my Epson Stylus Pro 4900 / 7900 / 9900 for GMG ColorProof?

Only an optimally set up printer will produce optimal proofs. In the following section, you will learn how to prepare your printer before using it for the first time with GMG ColorProof to ensure the best results every time.

Epson SureColor SC-P5000 / SC-P7000 / SC-P9000

How do I prepare my Epson SureColor SC-P5000 / SC-P7000 / SC-P9000 for GMG ColorProof?

Only an optimally set up printer will produce optimal proofs. In the following section, you will learn how to prepare your printer before using it for the first time with GMG ColorProof to ensure the best results every time.

Why does a white margin remain below my proofs?

This margin occurs on smaller proofs when a SpectroProofer is mounted on your printer. If the minimum length is less than 210 mm with this constellation, such a margin is unavoidable. This minimum length is enforced by the printer itself and is not defined by GMG ColorProof.

Epson SureColor SC-P7500 / SC-P9500

How do I prepare my Epson SureColor SC-P7500 / SC-P9500 for GMG ColorProof?

Only an optimally set up printer produces optimal proofs. Please ensure that your printer has been properly set up by an Epson-certified technician to achieve the best results. In the following section you will learn how to subsequently prepare your printer for use with GMG ColorProof.

Why does my printer eject unprinted media short before the roll ends?

This happens when the last piece of media has already disconnected from the cone. This is a normal behavior of the Epson SureColor SC-P7500 / SC-P9500 due to its construction.

Why is my control strip not measured for the last job at a roll?

This happens if the end of the roll is reached at the same time as your job and the media has already come off the core. In this case, the printer cannot rewind it anymore to measure the control strip. This is a normal behavior of the Epson SureColor SC-P7500 / SC-P9500 due to its construction.

Can I use my printer with GMG DotProof?

Yes, as of version, GMG ColorProof also supports the creation and use of profiles for the models Epson SureColor SC-P7500 and Epson SureColor SC-P9500. The adaption to the print mode, e.g. the use of only one print head for achieving the highes possible quality, is automatically done by the application.

Epson SureColor SC-S80600

How can I use my Epson SureColor SC-S80600 with GMG solutions?

We have created a guideline for you which guides you through the most important steps and functions when using your Epson SureColor SC-S80600 with our solutions. You can find this and further documentation on our GMG ColorProof tutorial page under the following link: GMG ColorProof Tutorials

Does GMG offer own media for the Epson SureColor SC-S80600?

No, GMG media is specifically designed for printers with water-based inks, not for models with solvent-based EcoSolvent inks such as the Epson SureColor SC-S80600. However, you can purchase compatible media from our official media partner JetComp via us. In GMG ColorProof, you can add and profile them in just a few steps with GMG Calibration Creation Wizard. GMG Calibration Creation Wizard is part of the optional license Module Epson SC-S80600 Bundle.

Why does my medium not absorb the ink or deforms while drying?

Please make sure that your medium is compatible with EcoSolvent inks. Unlike SureColor-P series printers, the model Epson SureColor S-80600 uses solvent-based inks.You can purchase compatible media from our official media partner JetComp via aus. If you have any questions or feedback about these media, please contact JetComp directly. This is the fastest way to get competent feedback on your individual request.

What To Do in Case of Error Messages?

Error message at program start: "A technical error occurred."

If you receive this error message when starting the program, there is a corrupt file in your GMG folder and must be replaced.

Error message after update: "You do not have a license to run this application." / "Your application license has expired."

Please make sure that you own a valid license for the installed version. If you have done an upgrade instead of a service update, you need a new license in order to run GMG ColorProof. You can recognize an upgrade by the fact that the number in the first or second position of the version name has changed, e.g. from version 4.5.x to 5.0.x or from version 5.12.x to 5.13.x.

Error message: "Connection to the dongle cannot be established. Please plug-in the dongle."

If no connection can be established to your dongle, this can be due to the hardware as well as the software.

Error message: "Printer is not calibrated for the selected calibration set."

This error message occurs if the last printer calibration is outdated or if the wrong calibration set is selected for the particular job and / or workflow. If necessary, recalibrate your printer and make sure that the correct calibration set is selected in all settings.

Error message: "The pre-linearization results are exceeding the defined tolerances..."

The color space enhancing inks Orange, Green, Violet, Red and Blue of printers are linearized before the actual calibration. If tolerances are exceeded during the required printings, the calibration process stops with the error message mentioned above. This can have several causes.

Error message: "Backup could not be created."

If you get this error message when trying to backup, there is an error in the path structure of your database. Use the integrated scan option to detect and repair the corrupt files.

Error message with Epson SureColor SC-P5000V: “Borderless Error – Load a supported paper size or load paper correctly.

Please cancel the job if you get this message. Then check if the right media is loaded and intact, and activate the Paper Size Checking setting. For roll media, also make sure that the spacer for borderless printing is installed.

Error message: "RIP/PMR Error" / "Printer Error: Please check the printer and resolve the issue. Then try to print again."

This error message occurs if the printer's firmware is outdated. Please download and install the latest version from the manufacturer's website.

Error message: "Failure while sending printer data: 80004005"

This error message indicates a communication problem between Epson SureColor SC-P7500 / P9500: and software. The cause may be the network connection as well as the hardware itself.

Error message: "Measuring device settings do not match." / "The selected measuring device could not be found. Do you want to keep the current device selected?"

This error message is displayed if the measuring background is wrongly set or dirty. However, it can also indicate a defective measuring unit.

Error Message: "Calibration Wizard cannot be started, because no measuring device has been selected"

This message is shown after a fresh installation if you launch the calibration wizard without having specified your measuring devices before. Please select your default measuring devices under System > Used Measuring Devices.... GMG ColorProof will then remember this setting for the future.

Error Message: "No device found. Please reconnect your device and retry."

This message is shown if GMG ColorProof cannot find your measuring device. There can be various reasons for this, either due to the hardware itself or incorrect settings within the application.

Error message: “The Standard Head is not mounted." / “e3StandardHeadNotMounted" / “Error in the application"

These error messages refer to the measurement devices X-Rite i1 Pro3 and X-Rite i1 Plus3. They are displayed if the ambient light sensor was not locked before measuring. Also, they are shown if using a measurement table to which the wrong measurement device has been connected.

Why do I see a yellow question mark in the job status after printing?

A yellow question mark in the job status indicates that there were issues when trying to access the reference data for your control strip. In most cases, the cause of error can be found in the proof standard settings.

Why do I see a red x in the job status after printing?

A red x in the job status indicates that the predefined tolerances were exceeded when evaluating the control strip. Common causes for this are an invalid calibration status or blocked printer nozzles. Please check your printer calibration status and print a nozzle test.