Why images often disappoint in print
Anyone who has optimized images exclusively for the web is in for a surprise on their first print order — a business card, a poster, a magazine ad. Colors look different, the printed image is blurry, or the print shop returns the file asking for corrections. Five places are responsible, and all five are learnable.
Resolution — the 300 dpi rule
Print works with physical resolution, measured in dpi (dots per inch). The standard for high-quality print products: 300 dpi at the final size. More background in our DPI/PPI post.
Concretely: an A4 page (210 × 297 mm) needs 2480 × 3508 pixels. A typical smartphone photo (4032 × 3024) is enough with room to spare. An image from a photo gallery at 1200 × 800 pixels, by contrast, is too small — printed, it comes out noticeably softer than the pretty preview.
For magazine ads, large posters, or wallpapers, 150 dpi or 250 dpi also applies depending on distance. Large posters viewed from 3 m away can be printed at 150 dpi without the viewer noticing — poster houses exploit that.
Color space — CMYK instead of RGB
Print works subtractively with four inks: cyan, magenta, yellow, black (key). The web works additively with red, green, blue. The two spaces differ in size: what glows vividly in RGB (strong neon blues, glowing green) often can't be reproduced in CMYK.
Send an RGB JPG to a print shop without conversion and you risk "out-of-gamut" colors: the printing process automatically maps them to the nearest available CMYK tone — often visibly duller and less saturated. The consistent workflow: convert to CMYK in Photoshop or InDesign before print and check in a soft proof what changes.
Exceptions: digital inkjet print houses (e.g. Saal Digital, WhiteWall) frequently expect RGB with an embedded ICC profile and convert internally. Check the print shop's help pages first.
ICC profile — the translator
An ICC profile tells the print RIP what the color values concretely mean. Without a profile, the system interprets the values as generic sRGB — which leads to wrongly rendered colors for an image intended for an Adobe RGB workflow.
Recommended profiles per use case:
- Coated FOGRA39 for classic offset print (magazines, brochures).
- PSO Coated v3 for modern offset setups, the standard in many European print shops since 2017.
- ISO Coated v2 for mid-grade paper.
- Uncoated FOGRA47 for stationery and uncoated papers.
Bleed margin and safety margin
Print machines cut sheets to the final size with a small tolerance of 1–2 mm. If you let an image run to the edge, you must lay it out beyond the edge. Standard: a 3 mm bleed margin on each side. An A4 page is thus laid out as 216 × 303 mm.
Additionally there's a safety margin inward — typically 3–5 mm — for text and important image elements. Otherwise print tolerances can clip them.
File format — PDF/X wins
Print shops typically accept PDF, TIFF, or high-quality JPG. Recommended in 2026: PDF/X, a print variant of the PDF standard. PDF/X-4 (ISO 15930-7, since 2010) is the modern choice with transparency support and embedded ICC profiles.
If you work in Adobe InDesign, export PDF/X-4 directly. Affinity Publisher, Scribus, and LibreOffice have similar export options.
Plain TIFF is still accepted but going out of fashion. Plain JPG is fine for individual images (e.g. a photo print), but not for layout PDFs. EPS is definitively obsolete in 2026.
Setting up black correctly
A subtle trap: black in print. Define "pure black" as #000000 in an RGB workflow, and after CMYK conversion you often get only 100% K (key) — a somewhat flat black that doesn't look rich on paper.
Pros use rich black: C 60, M 50, Y 50, K 100. That's 260% ink coverage — fine on paper that allows at least 280% total ink coverage. Print shops list coverage limits in their spec sheets.
Text in images
A common trap: text is baked into the JPG before it goes to print. Result: printed text looks washed out, because JPG compression smears text edges. Solution: keep text as vector, lay it over the image in the layout program. PDF/X preserves vectors all the way to the printer's RIP.
Embedding images in vector tools
If you design business cards in Affinity Designer or Illustrator, you can either link or embed images. Print workflow: always embed before the PDF/X export. Linked images can get lost when the file is sent around.
Checklist before printing
- Resolution: 300 dpi at final size reached?
- Color space: CMYK (or RGB with ICC for inkjet)?
- ICC profile: the right one for the paper (FOGRA, ISO, PSO)?
- Bleed: 3 mm laid out on each side?
- Safety margin: 3–5 mm to the edge?
- Black: rich black for large black areas, not 100% K?
- Text: as vector, not baked into the JPG?
- File format: PDF/X-4 (or the format the print shop requests)?
- Total ink coverage: under the print shop's max value?
If your focus is the web
For occasional print products from a web-first workflow, there are two pragmatic routes in 2026:
- Online print services with an RGB pipeline. Saal Digital, WhiteWall, photo-book specialists convert internally. Your image stays RGB.
- Affinity Publisher as an affordable InDesign alternative. A one-time ~€70 instead of a monthly Adobe subscription. CMYK workflow and PDF/X export are built in.
If you print regularly, you should still set up a calibration workflow for your own monitor (Datacolor Spyder, X-Rite i1) — otherwise the on-screen result looks different from the printed one.
Sources
ISO 15930-7 — PDF/X-4 · European Color Initiative (ECI) · Fogra — Research Institute for Media Technologies · ICC.org — Specification · Adobe InDesign — PDF/X export · Affinity Publisher.