Colour calibration is one of those topics that photographers either obsess over or ignore entirely. The ones who ignore it tend to discover the problem when a client calls to say the prints do not match the screen. The ones who obsess over it sometimes overcomplicate a process that, done correctly, is straightforward and takes about fifteen minutes once a month.

What an ICC profile actually does

An ICC profile is a small file that tells your operating system how to translate the colour values in an image file into the specific colours your monitor can display. Every monitor has a slightly different gamut. The range of colours it can reproduce. Without a profile, the operating system makes a guess. With an accurate profile, the translation is precise. The profile is created by a hardware colorimeter that measures how your monitor actually renders a set of known colour patches and builds a correction map from the results.

White point and why D65 is the standard

White point is the colour temperature of what your monitor renders as pure white. D65-6500 Kelvin. Is the standard for photography and print because it approximates average daylight and is the reference point used by most print labs and colour-managed applications. If your monitor is set to a warmer white point (lower Kelvin), your images will look warmer on screen than they will in print. If it is cooler, the opposite. We calibrate to D65 at Smart Peninsula and have done so since the studio opened.

SRGB versus Adobe RGB: which to deliver

SRGB covers roughly 35% of visible colour. Adobe RGB covers roughly 50%. For images that will only ever be viewed on screen. Social media, websites, email. SRGB is sufficient and is the safer choice because most browsers and applications handle it correctly. For images destined for print, particularly on wide-gamut inkjet printers or professional offset presses, Adobe RGB preserves more colour information in the greens and cyans. We deliver commercial clients both profiles as standard. Portrait clients receive sRGB unless they request otherwise.

How often to recalibrate

Monitor backlights drift over time. The rate of drift depends on the panel type and age, but a monthly recalibration is a reasonable minimum for professional work. We recalibrate on the first Tuesday of each month using a Calibrite ColorChecker Display Pro. If a monitor has been on for more than eight hours before calibration, we let it warm up for thirty minutes first. Cold panels read differently from warm ones. This is not perfectionism; it is the minimum required to trust what you are seeing.

What this means for delivered files

Every file Smart Peninsula delivers has an embedded ICC profile. This means that a colour-managed application. Adobe Lightroom, Photoshop, most professional print drivers. Will read the profile and render the colours as intended. If you open the file in an application that ignores embedded profiles, the colours may shift slightly. If you are printing and the results do not match the screen, the first question to ask is whether your print driver is set to use the embedded profile or to override it.

Calibration is not glamorous. It is also not optional if accuracy matters. The fifteen minutes it takes once a month is the cheapest quality control in the workflow.