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Error diagnosis: Colours

You have used register colours in your artwork files.

Producible with print approval!

When using register colours, all four CMYK colours are used 100% and thus have a total colour application of 400%. Register colours ensure that, for example, marks and page information are printed 100% on every proof and are therefore available to check the print on every exposed plate. They are not suitable for image data in the print area. In our offset printing method, we can ensure a maximum ink application of 300%. If this value is exceeded, there is a risk of the colours smearing in the print or sticking to the reverse side.

Correction note: Always create text and image objects in the layout programme using CMYK process. Use this for any placed objects as well. Avoid using the colour fields "Register colour", " Passermarks", "All" etc. within the design. 

Tip: Any trim marks within the design in register colour are permissible if you want to carry out the final trim yourself.

You have ordered stickers with white underprint behind coloured areas.

NOT producible with print approval!

For white underprint behind coloured areas, the area (of the sticker) must be created in a special colour that does not show through but has a white background.

The following points should be noted:

  • no colour gradients, transparencies, colour halftones, graphic effects
  • Font and line thickness at least 8pt (2.82mm) and font size at least 6pt (from white underprint)
  • needs a special colour channel ("white underprint") in 100% solid tone (not white, magenta is better)
  • Special colour channel always set to "Overprint"!

Please check this again and send us new files.

Your artwork files are created in RGB monitor colour mode.

Producible with print approval!

Explanation: In order to print with your files, they must be converted into CMYK print colour mode.The colours are displayed on the monitor by mixing luminous dots in the colours RED, GREEN and BLUE, which represent the desired colour depending on the luminosity of the individual dots. This is called additive colour mixing. The glow of the three colours optically adds up to one colour. In conventional four-colour printing, colour mixing is achieved by combining 4 "primary colours". CYAN, MAGENTA, YELLOW and KEY (colour depth - black). The colour effect here is created by reflecting certain colour components in natural light. This is known as subtractive colour mixing, as certain colour components of natural light are not reflected by the ink to produce the desired shade. Certain colours that can be displayed on the monitor because of their luminosity (e.g. bright greens) cannot be reproduced in print because the ink itself is not luminous.

As a result, there may be differences when converting RGB colours to their corresponding CMYK colours. We therefore recommend that you use the CMYK colour palette when creating your artwork files.

Tip: If you are unable to create your artwork in CMYK, we can convert it for you free of charge.

Please note that we cannot guarantee 100% colour fidelity as not all colours of the RGB colour palette can be reproduced in CMYK colours. The colours often lose the brilliance that was visible on the monitor before the conversion. Skin tones may have a reddish tinge.

If necessary, please confirm the conversion of your artwork from RGB to CMYK.

You have used too many special colours in your artwork files.

Producible with print approval!

Explanation: The colours used in the document are spot colours that cannot be produced in conventional four-colour offset printing. These include, for example, HKS colours and Pantone colours.

Correction note: You should replace the corresponding colour tones with similar or identical colours from the CMYK colour palette. Alternatively, depending on the software used, you can adjust the export options so that all colours used are automatically converted to CMYK.

A colour profile is not setup in your artwork.

Producible with print approval!

Explanation: A correct colour profile is just as important for perfect reproduction of your colours as the correct colour palette. Using different or no profiles can lead to significant colour differences. Please note that the same number of colours of a certain colour palette cannot be reproduced on different materials due to different surface structures and textures.

Correction note: Please add one of our colour profiles to your artwork when exporting (PSO Coated v3 - FOGRA51 (for printing on coated papers or advertising technology), PSO Uncoated v3 - FOGRA52 (for printing on uncoated papers)). If possible, please also embed the colour profile or define it as output (method) profile / Output Intent.

The artwork provided cannot be printed. Please give us written print approval for the conversion. Alternatively, please send us the corrected artwork.

An incorrect colour profile is stored in your data.

Producible with print approval!

Explanation: A correct colour profile is just as important for perfect reproduction of your colours as the correct colour palette. Using different or no profiles can lead to significant colour differences. Please note that the same number of colours of a certain colour palette cannot be reproduced on different materials due to different surface structures and textures.

Correction note: Please add one of our colour profiles to your artwork when exporting (PSO Coated v3 - FOGRA51 (for printing on coated papers or advertising technology), PSO Uncoated v3 - FOGRA52 (for printing on uncoated papers)). If possible, please also embed the colour profile or define it as output (method) profile / Output Intent.

The artwork provided cannot be printed. Please give us written print approval for the conversion. Alternatively, please send us the corrected artwork.