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Definition
An ICC profile is a standardized file that describes the color characteristics of a device (camera, monitor, printer) or a color space. ICC profiles enable color management systems to translate colors accurately between devices so that an image looks consistent from screen to print.
Every device reproduces color differently. A camera sensor captures colors in its own native way, your monitor displays a different subset of colors than your colleague's monitor, and a printer uses CMYK inks that cannot reproduce all screen colors. Without color management, a vibrant red on your screen might print as a dull maroon. ICC profiles solve this by providing a mathematical description of each device's color behavior, allowing software to translate colors between devices as accurately as possible.
The most widely used ICC profiles define standard color spaces: sRGB (the default for the web, covering about 35% of visible colors), Adobe RGB (wider gamut, popular in photography and print), Display P3 (Apple's wide gamut standard, 25% larger than sRGB), and ProPhoto RGB (very wide gamut used in professional RAW editing). When you export an image for the web, embedding an sRGB profile ensures consistent display across browsers and devices.
Image editors like Photoshop and Lightroom use ICC profiles to display accurate colors and convert between color spaces during export. When preparing images for print, converting from an RGB working space to the printer's CMYK ICC profile shows a soft-proof preview of how colors will actually look on paper. For web developers, the key takeaway is to always export web images in sRGB — it is the only color space that displays consistently across all browsers and devices without an embedded profile.