Inside the booth
Choose a consistent viewing light when checking booth print colour
The same print can look different under daylight, LEDs and warm lamps.
A print comparison is only useful when the samples are viewed under comparable illumination. A party room’s coloured light can make a correct print appear shifted beside a screen.
Use one stable source
Photographic and print colour references assume defined viewing conditions. Use a neutral, stable light and avoid mixed illumination when judging a proof. Keep the viewing distance and angle similar for both prints. ISO 3664:2025 specifies viewing conditions for reflective photographic prints and transparencies, while excluding display soft-proofing; a steady neutral lamp is a practical consistency aid rather than a standards-compliant viewing booth.
Separate room cast from file cast
Move the print to a neutral viewing area without changing the digital image. If its appearance returns closer to expectation, the room light was influencing perception. If the screen also looks shifted, check the display profile and brightness separately.
Label the proof sample
Write down printer, media, finish and viewing light on the sample envelope. A future comparison under a different lamp should not be treated as a direct colour test. Keep the approved print protected from fading and surface damage. Do not place the sample under direct sun for a quick check; the level and spectrum will vary over the day.
Evidence: International standard
Sources & further reading
Sources for the specific facts and product descriptions above. Our worked examples, interpretations and practical suggestions are original editorial guidance.
- ISO 3664:2025, Graphic technology and photography — Viewing conditionsInternational standard listing and abstract
- ISO, ISO 12646:2015 Displays for Colour ProofingInternational standard