Kroonpress Ltd technical requirements 2009-2014:
Part I – MAGAZINES – technical requirements for design and files


safety-area, small texts,
pdf file
pdffile, cropmarks,


Technical requirements for design

Bleed in case of adhesive binding During design the clean format must be added 5 mm of bleed on each side. The bleed must be symmetrical and the design must be placed in the middle of the page.
Bleed in case of wire binding During design the clean format must be added 5 mm of bleed on three outside edges.
Pictures in an adhesive-bound magazine extending over two pages

It must be taken into account that the inside of the front and back cover are glued to the content page with a strip of adhesive of about 5 mm wide. This method is called "hinge binding".

This binding method adds crease to the first and last cover page. This also makes inside cover pages shorter by hiding 5 mm of image under the glue.

Hence, in order to achieve a correct continuous picture extending from the inside of the cover to the first content page, both sides of the picture must be moved 5 mm towards the outer edge. See more info here: link.

The same moving method can be used in thick magazines (if more than 100 pages) in case of two-page pictures on the middle content pages, but the moving distance largely depends on paper type and thickness (hence generally the moving is not needed for content pages).

Weight of the cover

The weight of the cover material should be proportional to the size, thickness and weight of the book block; the thicker the book block, the heavier the cover material. The recommended relationship between thickness of the book block and the cover basis weight is given in Table "Book block thickness - Cover basis weight" (ISO 16763:2016(E) 4.8.2.).

Up to 15 mm: 120 – 250 g/m²
From 15 mm to 30 mm: 150 – 320 g/m²
Above 30 mm: 200 – 400 g/m²

The placing of design elements

Texts and other critical design elements (borders, lines etc) must be placed at least 4 mm from the trim boxSee more info: link.

In case when the magazine is glued (perfect binding is used) the content pages are not fully visible in the area near the inside binding. Hence, important designs elements should not be positioned near the binding area where these elements can be hidden when the magazine is not fully flattened. See more info: link.

Online-adhesive magazines

In the design it must be taken into account that the middle strip of adhesive which connects the pages covers about 1 mm of both pages (the width of the glue strip is 2 mm). There is no need for a white line. Texts and other critical design elements (borders, lines etc) must be placed at least 4 mm from the trim box.

Avoid the cross-over text but instead use large character kerning between center letters or position the "space" between words. See sample.


Colored and white objects (except 100% black) must not have a defined overprint mode. See sample.

Black overprint must be added to the design elements and texts (100% K) on colored background.

Non-overprinted black – CMY:1%, K:100% - must be used on black surfaces on which overprinting must be avoided (e.g. the black frame covering the edge of a picture).

Black overprint is added automatically at a printing house to improve printing quality.

Trapping of objects In the contact point of objects of different color the edge of the darker object has to cover the contour of the lighter object with 0.15-0.4mm trapping. Trapping is added automatically at a printing house to improve printing quality.
Small texts

Avoid using of 8 point or smaller texts (or text height less than 2 mm, or minimum line width less than 0.2 mm) which knock out inside a colored surface nor consisting of several colors.

The minimum height of italic or serif type in colored objects must be at least 8 points.

To ensure contrast the reverse type must not be placed within screened areas less than 50% or in yellow background.

White texts

For the white text on dark background (aka reverse or negative text) the background color should recommendedly be solid 100% black or classical rich-black (CMY:50:40:40 and K:100%). In these conditions white trapping (a.k.a. keep-away trapping) is added automatically at the printing house to improve printing quality.

Additionally, for the sake of quality, add the outline (stroke) under the white text with the color of non-overprinting black (CMY:1% K:100%) with stroke size of 0.25 pt.
Line-art The minimum width in case of line-art has to be at least 0.15 mm. Line-art must not use more than two colors which are overprinted.
Pictures with pure tones To get the best printing result, the color pictures must be processed into pure and bright colors, by removing the “staining tones” from the pictures. To achieve pure tones, it is recommended that yellow is removed from the blue tones, magenta from green, cyan from yellow tones etc making sure that the details of the picture do not suffer in the process.
Color space of all pictures and vector objects
– heatset printing
Pantone tones, RGB, Lab etc are automatically converted to CMYK which may remarkably distort the tones requested by the client.
Color space of all pictures and vector objects
– covers, inserts, etc in sheed-fed printing

CMYK + Pantone tone(s) specified in the written order.
Other Pantone tones, RGB, Lab etc are automatically converted to CMYK which may remarkably distort the tones requested by the client.

Use this color chart for choosing spot color.

Read these remarks when ordering the varnish.

The use of black color

In the design the use of 4-color black (rich black) must be avoided in case of small black texts and line objects. For small black texts use only black ink color (100% K)

In case of large black areas 4-color black (for example C:40, M:30, K:100) must be used.

The color All (or Registration) is not reccommended and will be converted automatically to only black ink color (100% K).

Metallic and florescent (neon) colors:

If using PMS metallic (Pantone 871) or florescent colors (Pantone 801) in the design, there should be know that these inks are not transparent but opaque and will be printed as last inks. In case of designing of black texts on top of objects of metallic or neon colors, the non-overprinting black color of CMY:1%, K:100% should be used. If usual black color of only 100% K is used, then black ink is covered with opaque spot-color and the black object will not be visible.

Black-and-white vector objects Black-and-white vector objects must not contain CMYK or RGB color tones
The limits for the reproduction of an integrated and uniform screen (i.e tone values) on a paper Tone value reproduction limits are 3% - 97%
No significant image parts shall rely on tone values outside of the above tone value reproduction limits.
Maximum summarized raster percent
(TIL – total ink limit)
Depends on paper type (see the requirements arising from the paper used).
In case of pictures it is ensured by the use of the right ICC profile, in case of vector graphics the fulfilment of the requirement must be ensured by the designer.
Resolution power of the pictures in design

Double screen frequency (see the requirements arising from the paper used).

The smaller decreases the quality of pictures, the bigger does not improve the quality, but increases the size of the files and makes their processing slower.

The present guideline is GWG 2015 Specifications.

A digital increase of the resolution of low resolution pictures to the required level Kroonpress Ltd considers such transformation a deliberate activity by the designer. The automatic inspection of the files will not detect it.
Insert perforation Perforation line must not be drawn in the design, but if necessary, it must be designed with spot color (e.g. Perforation) and it must be defined to overprint. The typical distance of the perforation line of a coupon from the inside gutter is 15 mm.
Continuous and broken perforation

Continuous perforation runs in a straight and unbroken line from one page edge to the other and is performed with the perforation wheel-knife of the folding machine.

Broken and special perforation is performed with die-cut form. Cardboard is also perforated with a die-cut form. In case of die-cut a special form should be prepared and the whole process may take longer.

Dye-cut line

Dye-cut line must be designed with spot color (e.g. Dye-Cut or Perforation) and it must be defined to overprint. See more guides: 1 and 2.

Special dye-cut forms must be designed with different colors: knife = red line, grease = green line, perforation = yellow line. There should be avoided double lines and dotted lines.

Folio design

Folio must be designed as monochrome (only black and white) objects with spot color (e.g. Folio) and it must be defined to overprint. Folio will be added on top of background image without white knockout holes.

The thin line with folio or (knockout) line in the folio background should be at least 0.3 mm width (recommended width 0.5 mm). Color object on folio background (like color knockout text) must have 0.25 mm trapping (e.g. text should be extended with overprinted outline).

The correctness of positioning of folio is 1 mm, therefore avoid thinner than 3 mm lines (outlines) around the folio object.

Folio will be added with hot glue and pressure, therefore the pressure marks can be slightly visible on the opposite side of paper. 

Spot UV varnish

Spot UV varnish object must be designed together with CMYK layout with spot color (e.g. SpotUV) and it must be defined to overprint. See more guides here.

The minimum width of lines or knockout (holes) of objects has to be at least 1 mm.

It must be taken into account that UV varnish is yellowish and can distort background color tones. Also mattee varnishes (and laminate) can decrease brightness and glossyness of color tones.

When choosing additional spot colors, it must be taken into account that most varnishes in case of some specific Pantone inks, due to the chemical reaction, will dramatically change color tone. For example Pantone Purple will turn to pink when covered with UV-varnish. The same happens with all inks containing Pantone Purple, Rhodamie Red, Violet, Reflex Blue, Blue 072, Warm Red and Red 032.


Barcode should be designed for the sake of readability with 100% of black color in vector graphics.

Barcode should be precisely readable, therefore the EPS file format is the best (because no blurry edges) but TIF format is also suitable when the image resolution is high (300 dpi) and edges are contrasted.

We recommend to use Free Online Barcode Generator.

The requirements arising from the paper used – heatset printing

Paper type

Screen frequency (lpi)
Total ink limit (total)
ICC profile for converting pictures to CMYK
Coated papers
150 300% PSO_LWC_Improved_eci.icc
Machine finished coated paper
133-150 280% PSO_MFC_Paper_eci.icc
Woodfree uncoated papers
133 280% PSO_Uncoated_ISO12647_eci.icc

Supercalendered papers
- SC




Improved newsprint
133 260% PSO_SNP_Paper_eci.icc

The requirements arising from the paper used – sheet-fed printing

Paper type

Screen frequency (lpi)
Total ink limit (total)
ICC profile for converting pictures to CMYK
2 and 3 times coated papers
175 330% ISOcoated_v2_eci.icc
Coated papers
150 300% ISOcoated_v2_300_eci.icc
Uncoated papers
133 280% PSO_Uncoated_ISO12647_eci.icc
– coated side
150 300% ISOcoated_v2_300_eci.icc
– uncoated side
133 280% PSO_Uncoated_ISO12647_eci.icc

Requirements for files

File format PDF should accept standard PDF/X:1-a (2001)
The preparing of PDF-files

Based on the instructions at

NOTE: Instead of custom "job option" you can use pre-setting "PDF/X-1a"

Unseparated PDF file PDF files must be unseparated (composite)
One PDF-file page =
one document page

Each PDF page must only contain one document page, i.e. 1-up single page. The reader's spread layout is not recommended.

NOTE: Prepress software requires one PDF file for each page. If you sent PDF of double-page ad, we have only one PDF file for two pages. That's why software have to use the same file for both pages and why it show the same page twice. Later, on imposition stage, both double-pages will be cut to single page size: only right side will remain for right-side page and only left side will remain for left-side page. These two pages side by side will form the complete double-page and thus only one complete design will be in final print product.

PDF file can be multi-page document, but single page PDF files are preffered for easily isolate any problems and or corrections.

Cover files

The reader's spread pages layout is not recommended. The spread pages may be only used when the cover design is with continous background image.

The spine of the publication must be designed in separate PDF file (due to different page size). Follow guides: Q or Y.

Spine width can be calculated and value should be agreed with Sales Manager.

Cover in Portal

In our prepress and web approval system Apogee Portal, there is not possible to show correctly the pages in the form of readers spread (double-pages).  Therefore we do not recommend to combine the cover pages as spreads.

Create the cover pages as 5 separate pages - cover page 1, cover page 2, cover page 3, cover page 4 and spine (spine is on 5th position). If the spine is just white area without design, the spine is combined with first cover page or if you do not have the spine, then leave the 5th position as empty.

Special covers

If the cover has additional pages like inside or outside (front or back) flaps, then prepare them as separate PDF pages - flap front (OF) and flap back (IF). Please note that size of flap page is different - see specs here.

If you use Portal, then place them after main cover pages and spine - for example place them onto as 6th (for front side) and 7th position (for back side) (in case of two flaps - 8th and 9th position).

For naming the cover pages it is recommended to use page numbers or descriptive abbrevations: FC or OFC - Outside Front Cover, IFC - Inside Front Cover, IBC - Inside Back Cover, BC or OBC - Outside Back Cover, FF or OF - Outside Flap, FB or IF - Inside Flap. (... taken from "Printing Dictionary" by

The flap design measurements: see specs here. The width of flap page is 15 mm less smaller than cover page.

The names of PDF-files

The name of the PDF file of every printed matter must include the name of the job and its page number(s) (e.g. print008.pdf – page 8 of printed matter called “Print”).

The using of "underscore symbol" ("_") as the separator of job name and page number is recommended: 003_Magazine10-2011.PDF or

Multi-page files should have page number range in it's filename. EXAMPLES: 003-005_Magazine10-2011.PDF or

Wrongly named files can create misunderstandings and faulty production.

Finality of the PDF-file PDF files must be final, i.e. all advertisements and other elements must be installed into the PDF fail sent to the printing house.
Design format 1 : 1   (design and end result are the same size)
Technical marking

In general, PDF files must not include any technical marking – measurement scales for inks, names of colors, registration marks or crop marks.

NOTE: In some cases the color of crop marks (i.e. Registration color or 400% of CMYK) can create the false-alarm about exessive ink amount (i.e. warning of "Too high Total Area Coverage").

The crop marks (and also marks designating the perforation line) in the bleed area must not be closer than 3 mm to the clean publication format (TrimBox). See example or read more about PDF boxes.

Fonts All fonts used in design must be included in the PDF files sent to the printing house.
The changing of files If the client makes amendments to the files sent to Kroonpress Ltd, he/she must immediately notify the prepress department or the sales manager. Otherwise Kroonpress will not guarantee that the amendments will be printed.
The confirming of softproofs Softproofs must be confirmed in writing (using for example an e-mail)

Requirements for color proofs

Kroonpress does not accepts the print samples of other printers or other color prints that do not comply with the following conditions. Kroonpress Ltd accepts only the color proofs of the client which base on the following conditions:

  • one and the same ICC color profile has been used in preparing proofs and files which conforms to the printing paper used;
  • it is possible to verify the accuracy of the color tones on the color profile:
    • each color proof has a color strip conforming to the requirements of ISO12647-7:2007,
      for example UGRA/FOGRA Medienkeil v2.0 or v3.0;
    • in case of some other control strip the respective CMYK values must be added to the measurement field;
    • ICC color profile name must be marked to each color proof;
    • if a non-standard ICC profile is used, it must also be sent to Kroonpress Ltd.
  • the results of the verification of proofs conform to ISO 12647-7:2007 requirements.

See more information about certified contract proofs at IDEA.
See samples of our in-house contract proofs.

Printing quality

To ensure printing quality Kroonpress Ltd is entitled to make the following unavoidable printing changes to the client’s files:

  • the adding of overprint to black ink (100% K);
  • the adding of trapping to the contour of objects of different color;
  • a decrease in the maximum summarised raster percent (total ink limit) to the amount suitable for the printing paper;
  • conversion of RGB and Pantone tones to the CMYK color space (except if the client has ordered Pantone additional color).


Kroonpress is entitled to reject the material sent by the client which does not conform to the technical requirements and demand the submission of material which conforms to the technical requirements.

The remaking costs of the material submitted by the client which does not conform to the technical requirements in Kroonpress Ltd, also the additional costs at the printing house arising from the material not conforming to the technical requirements shall be incurred by the client.

The technical requirements can be matter of change. Check regularly to stay up to date with the latest technical requirements.

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