FAQ and Glossary

In a global world, speaking the same language is essential, particularly in
an image production chain.

You will find a list of the most relevant questions and a glossary
of the most used terms in our profession.

What is the role of Images3 in the graphics chain?

Images3 is positioned between content producers – photographers, creative agencies, advertisers – and content distributors – printing companies, all types of media, points of sale, events, etc.

Images3 starts from the basic image then performs verification, retouching, integrating into an existing runtime file or creating a new one, adjusting the colours, organising the proof control and then distributing the final file, either to the media or a file repository to for storage and archiving in a database.

This operation is repeated many times throughout the certified quality process, across a vast array of image subjects, formats and media. This process is an integral part in managing our clients’ brand image. Subsequently, Images3 enjoys a unique point of view, between the basic image and the final file and is able to manage and optimise the multiple runtime files that make up the brand image of its clients.

/File repository*: also referred to as a Mediacenter or Digital Asset Management (DAM)


What is prepress?

Prepress is a generic term which covers all the processes involved in preparing documents before they are disseminated via a medium.

Originally, this step only involved preparing documents before going under the press in a printing project, hence the word prepress! These days it involves adapting documents to the media requirements (web or print), all of which are now in digital formats.

What is the difference between an RGB and CMYK image?

An RGB image (Red, Green, Blue) is a work file for retouching and optimisation, of sufficient quality to be displayed on computer screens.

The CMYK image is a result of this work, it is an image which can be adapted to a certain type of printing and paper. For example, the offset printing method on coated paper requires a CMYK image.

For further information on CMYK and RGB:

  • CMJN is the acronym for the four primary colours: Cyan, Magenta, Yellow, and Key (black). It is the colourimetric mode for printing. It enables the reproduction of a large palette of colours by mixing the three primary colours: cyan, magenta and yellow. Black is added at the end of the printing process.
  • Le RVB (Red, Green, Blue) is the default colourimetric mode for computer screens. The colours displayed depend on your screen configuration. On two different screens, the colours displayed can have a different render even if the nuances are the same.

How do I know the size of the image I can print?

Before printing, you should verify that the image file will produce adequate quality for the print. This is measured by three important parameters: definition, size and resolution.

  • Definition, is the number of pixels (of points) that make up the height and width of the image.
  • Size is that of the image to print, its dimensions once it is printed.
  • Resolution is result of the definition and the size. In photography, it corresponds to the number of pixels per surface unit, the concept of pixel density. It is measured in DPI (dots per inch). An inch is 2.54 cm. These three characteristics interact in the preparation of your images.

For standard formats the optimal resolution is 300 DPI at 100% size. .

For example, if you “stretched” an image of 72 DPI to 150%, you would get an image with an effective resolution of 36 DPI (72/2), which is very low quality. However, if the image is reduced to 50%, the final result would be an image with an effective resolution of 144 DPI (72×2). For specific formats and especially for large formats such as tarps and billboards, please contact us directly.


Why should images be adapted to the media format?

Each medium has requirements that are unique: display and colour management, technical specifications, ink, image size and type of paper. er.

Each of these unique requirements must be taken into account when preparing the image.

For print, the image must be adapted to the paper type (coated or uncoated), the printing method, even the choice of ink.

For the web, the image will be adapted according to size and optimal definition


Why have a profile?

A colourimetry profile is the colour ID card of a colour reproduction device. It is sometimes called an ICC profile (International Color Consortium). The profile is created during the calibration of the device. Each device has its own profile.

This profile tells us how a printer, scanner, camera or screen will behave with colours. The profile facilitates the consistency between images from different devices and thus ensures colour display according to the initial requirements.


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