EAN / GTIN test e.g. for ALDI 3B verification according to ISO/IEC 15416, ISO/IEC 15420

From now on we offer our customers the service to check EAN 8 and EAN 13 codes metrologically. This is important, for example, if you deliver articles for ALDI or HOFER, for which you have to provide proof of readability according to the so-called “3B” standard or better. You can order such an EAN GTIN barcode test report here in our shop.

Proof.de Test report according to ISO/IEC 15416 / ISO/IEC 15420 according to 3B criteria e.g. for barcodes for ALDI and Hofer. The test report is created on the same day and sent to you as a PDF or by post.

For this purpose we check your EAN or GTIN code with a modern REA Check ER barcode checking device and prepare a test report according to ISO/IEC 15416 and ISO/IEC 15420:

  • Symbol contrast
  • Edge Contrast
  • Modulation
  • Rmin/Rmax
  • Defects
  • Decodability
  • Rest area Left
  • Rest area Right
  • Bar deviation
  • Code length

Other optional parameters are also checked:

  • PCS (SC)
  • Bright value (Rmax)
  • Bar
  • Gap
  • Mean value
  • Z-Module
  • Size
  • MF
  • CPI

For example, in the “Size” field you can see directly whether your code corresponds to the size SC2 preferred by ALDI, for example. We have attached an exemplary evaluation above.

For the measurements we need original packaging with your printed EAN / GTIN codes. All codes will be checked on the day of their arrival and the test reports will be sent to you the same day.

Verifiability of GTIN codes in proofing

Proofing service providers are increasingly required to be able to display “verifiable” GTIN codes, i.e. barcodes in the proof.

The background to this is that especially the big german discounters like Aldi, Lidl, Hofer & Co. want to see a packaging proof from their suppliers in advance for approval. This packaging proof is not only visually assessed according to colour, but also the legibility of the printed EAN codes is evaluated using a measuring device and must meet certain criteria: Symbol contrast, modulation, decodability, defects, blemish: all this is measured and graded.

Depending on the selected setting, the GTIN lines in proofs are displayed smoother or less smooth. It is clearly visible that the modules are made up of many colours and that a considerable increase in width takes place especially within the narrow black lines. Normally a narrow black GTIN bar should correspond to the width of the white space.
Depending on the selected setting, the GTIN lines in proofs are displayed smoother or less smooth. It is clearly visible that the modules are made up of many colours and that a considerable increase in width takes place especially within the narrow black lines. Normally a narrow black GTIN bar should correspond to the width of the white space.

This involves two different risks for the advertising agency or the reproduction company that processes this data: Firstly – according to our information – in most cases the proofs are not viewed under D50 standard light, but under TL84 – the light under which the packaging will also be seen in the later sales situation. This is understandable, since the sales process takes place under TL84 and not under the standard light of a printer. On the other hand, retouching under TL84 is not mandatory, since the spectral behavior of “standard” neon means that it is not possible to produce such a reproducible and “color-accurate” result as under D50. In addition, a colour matching box with D50 and TL84 is available in very few companies, which makes it possible to view the result under both light conditions in the colour retouching.

Secondly, the proofed GTIN barcodes are measured by a measuring device and checked for their mechanical legibility. Whereas a few years ago a press proof was the standard for such tests, today mostly the digital proof is used, since it is much cheaper. But until now, the manufacturers of proofing software have always only paid attention to the representation of color, but never to the verifiability of black and white lines.

Especially with Fiery proofs, but also with GMG Color, the lines of the GTIN barcodes are usually reproduced in such a way that they correspond exactly to the black value of the required profile in terms of color, but only school grades of 3 or even 4 are achieved during the examination, depending on the discipline. Most scanner cash registers could still read and process these barcodes without problems. However, ALDI Süd or Hofer with their own GTIN codes require at least a second grade in all disciplines: The proofs all fall through the test grid of the discounters. In particular, the decodability of EAN codes has probably not been of particular importance to proof manufacturers up to now.

After detailed tests, the width increases of the GTIN bars in the digital proof and the blurring of these bars seem to be the biggest problem for the verifiability of the codes. Farbproofs.de has developed a solution together with one of the testing companies for barcodes that makes it possible to print testable GTIN codes in accordance with the strict ALDI standards, which also comply with the current proofing standards. A proof is therefore sufficient for colour matching and for checking the GTIN numbers. However, the EAN must be created and edited specifically for this purpose. This still costs far less than a conventional proof, but it is not satisfactory.  Manufacturers of proofing software such as EFI and GMG Color are therefore called upon to improve the calculation of black and white line representations in writing and GTIN codes.

Until now, the focus has always been on color accuracy, but the proof increasingly demands services that were previously reserved for proofing. At costs of 5-10 EURO for a digital proof in DIN A4 format and 150-300 EURO for a proof in the same format this is more than understandable.

An article with tips for the creation of EAN / GTIN codes for graphic designers and the problems of verifiability of EAN and GTIN codes for e.g. Aldi, Hofer, Lidl and Co can be found here.

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