Proof and color settings

1. It is recommended to attach a contract proof to every order.

2. If the contract proofs were carried out before the final correction, files submitted for printing must include information about the changes.

3. Contract proof must consider the necessity to simulate the printed substrate / paper.

4. Contract proof must be marked with the name of an ICC profile which it was made with, and must include a control strip which is used to spectrophotometric control of its correctness. The recommended control strip is the UGRA / FOGRA strip.

5. Proof is acceptable as a contract if the color difference E * ab:

• does not exceed 5.0 for CMYK fields,
• average for the entire control strip <3.0
• maximum <6.0
• substrate color deviation <3.0
   

6.  Conformity assessment of color between the contract proof and the print is visual and, due to the phenomenon of "metamerism", should take place under standardized lighting conditions, i.e. a D50 (5000K) light source with a color rendering index of Ra > 90. Due to differences in production method and pigments used, the production print may not match the colors of the contract proof 100%.

7. Once the print is accepted by the client, the printed sheet accepted and signed by the client becomes the color reference.

8. Prints from earlier production runs may serve as a reference for the printer. However, the printing house cannot guarantee identical color reproduction, due to changes in ink and paper color over time, the possible use of different inks, differences in dot gain caused by different machinery, and differences in file preparation.

9. For PANTONE and HKS spot colors, the color swatches provided by the ink manufacturer are used as the color reference.