Help/FAQ

What type of files do you need?

Supply us with the graphic files in pdf format, in high resolution (300dpi) with 3mm bleed. In case you don’t have the necessary software or you want our advice or help in the preparation of the graphic files, our internal graphic design department can be of assitance. In this case, contact as during opening hours via phone: 269288 or e-mail : info@cdpress.lu.

What is the bleed for?

The 3 mm bleed is necessary for all printing on paper (booklets, sleeves, packaging, etc). It allows us to ensure perfect rendition when cutting your documents to size. Therefore we cannot accept files without these 3 mm borders because it is difficult, even often impossible to modify them to fit our technical specifications.

Who do I send my graphic files to, and how?

You can send the digital files to us via mail on a CD/DVD : CD Press Luxembourg, Z.I. "Chaux de Contern", 1a rue des Chaux, L-5324 Contern or  e-mail: layout@cdpress.lu.

You cannot put the graphical files on the same disc as the audio files. Provide us with the files of the content of the disc (video, audio files, etc.) on a physical CD/DVD or like mentioned before via e-mail. Also you should not bring the digital files on a USB Stick

What does CMYK mean?

CMYK is the process used for offset printing (c: cyan / m: magenta / y: yellow / k: black). In French it is called CMJN. When producing a CD/DVD, graphic source files must be prepared using this system, and not RGB which is the color display mode used by your screen.

What is solid black and how do I produce it?

A solid black, also called a deep black is an area printed black over a base of the other colors in the four-color process (cyan, magenta, yellow). A solid black is made up of the following values: 100% black / 60% cyan / 40% magenta / 40% yellow. You can use these values in DTP software, to tell us that you want to obtain a deep black.

How should I send my master/original CD/DVD?

We ask you to send us your master in a padded envelope. In order to ensure an optimum burn quality, we ask you to burn your audio master at 2X, your CD-ROM master at 16X and your DVD master at 2X. The master that you supply to us must correspond absolutely bit-for-bit with the finished CD/DVD that you want us to supply back to you.

We advise you to check every detail of the content and operation of your master by reading it on different machines of varying generations, different configurations and where possible, different types (read a video DVD on a computer and a dedicated player, and the same for an audio CD). We recommend that you make a duplicate of the master that you send us and that you look after it very carefully. We ask you to supply us with a master free of finger marks, scratches, dust etc., burned on a high quality disc (ask us for advice if you need to). CD-RW and DVD+/-RW formats are not usable as input media for duplicating and pressing CDs/DVDs. You should burn your master in the recording method “Disc at once”, so you don’t have several sessions on the disc.

What is the delivery time?

For lager quantities of standard productions, the industrial pressing takes 10 workdays. Particular jobs requiring the production of “custom” packaging or manual insertion, (ex. gluing of pockets into brochures) require scheduling and special delivery times, to be discussed during the initial job specification process.

For small quantities (less than 500 pieces) thermal re-transfer printing and burning provide an “express” duplication service within 24 hours, knowing that the standard delivery time is 3-4 workdays.  Also, standard packaging and even certain types of digitally produced personalized printing can be provided by our “express” service. Do not hesitate to contact us. You will always receive the best possible service with a view to giving you the very best delivery time. The “express” service involves an additional charge.

What is the difference between pressing and duplication?

Duplication and pressing are two different manufacturing processes. One is suitable for short runs and can be done within 24 hours; the other is suitable for quantities in excess of 500 pieces and allows us to offer an extremely low unit price.

Pressing consists of making a glass master from an original media (or master) which in turn allows a stamper to be produced. This is an industrial mould made of nickel used in high-speed plastic injection. Liquid polycarbonate is then injected at high pressure into an industrial press fitted with the stamper to obtain a transparent disc (with a thickness of 1.2 mm) which already includes the master's binary coding. The injection cycle takes less than three seconds. All that remains to be done is to cover the CD with a coating of aluminum which produces a mirror effect (to reflect back the laser beam), over which is applied a film of varnish (to protect against oxidation) and to print your visual (label) with serigraphy or offset.
In the case of a DVD, two 0.6 mm discs are produced. These are then glued together using a polymer resin. In the case of a DVD5 (4.7GB.), only one of the discs contains the binary coding. The other is used only as a spacer to obtain the desired 1.2 mm thickness.
This pressing (or replication) technique is expensive for short runs because the creation of the glass master and stamper is complex. The injection phase, on the other hand, is relatively cheap, which makes the process perfect for runs above 500 units.

Duplication or burning is advisable for short runs and allows delivery of the finished product in 3-4 days, and in case of need even in 24 hours, depending on the particular case. The original source is copied on to a robot which burns blank CD-Rs or DVD-Rs using a red or orange frequency laser. The CD-R or DVD-R media therefore already exist. They are then printed, using an ink-jet printer or thermal re-transfer.
Attention: DVD-Rs are not compatible with all home players.

What is the purpose of the aluminum layer between the layers of polycarbonate in a CD/DVD?

The application of a layer of aluminum on a CD/DVD serves to reflect the light from the laser beam when reading a disc. The aluminum is covered with a fine layer of varnish to protect it against oxidation which would damage its mirror effect properties.

On what basis is the printing process (offset or serigraphy) for the CD label chosen?

If the design to be printed on the surface of the CD/DVD is half-tone, or if it is a photograph, a picture or has color graduations, we recommend offset printing. When printing solids (printing area 100% the same color) as well as for Pantone colors (bold tones and pure colors not reproducible by 4-colour process (CMYK)), we usually print the visual on the CD/DVD in serigraphy. The definition achieved using offset printing is superior to that achieved with serigraphy (60 or 80 lines per centimeter as against 54). With serigraphy the colors are more saturated, while in offset colors blend better but they are not so bright.

Why are the colors of the product received different from those on my screen?

You cannot rely on colors displayed on a traditional computer screen because each screen is calibrated differently and so displays color shades differently from one screen to the next, even if they are both of the same make and model. Only calibrated screens that are part of a completely calibrated system (screens, proofing systems, offset presses) within the same printing site can be used in this way.

To avoid all missunderstanding and to assure that you obtain the desired result, print a sample for us and give it to us with the digital files