Colour Space Workflow in Photography: The Complete Guide to sRGB, Adobe RGB, ProPhoto RGB, Profile Conversions, Gamut Mapping, and Managing Colour Across Devices

Colour space management is the invisible infrastructure that determines whether your photographs look consistent and accurate across every device, platform, and output medium — or whether they look different on every screen, shift colour when uploaded to social media, and print differently from what you see on your monitor. A colour space defines the range (gamut) and mathematical encoding of colours that a digital file can represent, and the choice of colour space at each stage of the photographic workflow — capture, editing, delivery, and archiving — has profound implications for colour accuracy, quality preservation, and cross-device consistency.

Most colour management problems in photography are caused by one of three issues: (1) editing in one colour space and delivering in another without proper conversion, (2) delivering files in a colour space that the recipient's device cannot display correctly, or (3) failing to embed the ICC profile in the exported file, leaving the receiving device to guess which colour space the data represents. Understanding how colour spaces work, when to use each one, and how to convert between them correctly eliminates these problems entirely — producing photographs that look exactly as intended on every calibrated display, every social media platform, and every printed output.

The Three Standard Colour Spaces

sRGB (Standard Red Green Blue) was defined in 1996 as the standard colour space for consumer displays and the internet. Its gamut is relatively small — roughly 35% of the visible colour spectrum — but it encompasses the colours that typical consumer monitors, laptops, tablets, and smartphones can display. Virtually all web content is assumed to be sRGB by default, and browsers, social media platforms, and operating systems all handle sRGB reliably. sRGB is the safe, universal delivery colour space: if an image is in sRGB, it will look correct (or very close to correct) on virtually any modern device without special colour management by the viewer.

Adobe RGB (1998) has a wider gamut than sRGB — roughly 50% of the visible spectrum — with significantly more saturated greens, cyans, and some blues. It was designed for professional photography and prepress workflows where the wider gamut is needed to reproduce the full colour range of CMYK printing processes. High-end monitors (Eizo ColorEdge, BenQ SW series, NEC PA series) can display most or all of the Adobe RGB gamut, and professional print labs and inkjet printers can reproduce colours that fall within Adobe RGB but outside sRGB. Adobe RGB is the professional working and delivery space for print-focused photography.

ProPhoto RGB has the widest gamut of the three standard spaces — roughly 90% of the visible spectrum, plus some colours that are physically impossible (they fall outside the horseshoe-shaped visible colour gamut in CIE chromaticity diagrams). ProPhoto RGB is used exclusively as an editing space to preserve maximum colour data during post-processing: when converting from the camera's raw colour data to a standard colour space, ProPhoto RGB preserves the most colour information, giving you the widest latitude for adjustments. ProPhoto RGB should never be used as a delivery space because virtually no display device can show its full gamut, and the very wide encoding means that small numerical changes in pixel values produce large colour shifts.

Editing Colour Space: Where to Work

When editing RAW files in Lightroom Classic, the internal processing is done in a wide colour space (Melissa RGB, which is essentially ProPhoto RGB with a linear gamma) — you don't choose an editing space in Lightroom because the RAW processor handles colour internally up to the point of export. The colour space choice in Lightroom only matters at export: you select the destination colour space (sRGB, Adobe RGB, ProPhoto RGB, or Other) in the export dialog. This means Lightroom preserves maximum colour data throughout editing regardless of the destination colour space, and colour space conversion only occurs at the final export stage — an ideal workflow.

When working in Photoshop, you must set the editing colour space before opening the file (or during the Camera Raw handoff). For maximum quality preservation, set Photoshop's working colour space to ProPhoto RGB (Edit > Color Settings > Working Spaces > RGB: ProPhoto RGB) and work in 16-bit mode. This preserves the full colour data from the RAW conversion and provides the most headroom for adjustments — particularly important for operations like saturation increases, colour grading, and channel mixing that can push colours outside smaller gamuts. When the editing is complete, convert to the delivery colour space (Edit > Convert to Profile) before saving the output file. Working in ProPhoto RGB at 16-bit and converting to the delivery space as the final step is the gold-standard Photoshop workflow for colour quality.

Profile Embedding: Why It Matters

An embedded ICC profile tells the receiving device which colour space the pixel values represent. Without an embedded profile, the device must guess — and different devices guess differently. Most browsers assume sRGB for untagged images (which is correct if the image is actually sRGB), but some applications display untagged images in the system default colour space, and colour-managed applications may display untagged images with incorrect colour shifts. Always embed the ICC profile in every exported file: in Lightroom, this is automatic; in Photoshop, check "ICC Profile: [profile name]" in the Save As dialog. Never strip ICC profiles from exported files — doing so is one of the most common causes of colour inconsistency across devices.

A special case is social media platforms: Facebook, Instagram, and most social media sites strip ICC profiles during their server-side image reprocessing. This means the embedded profile is lost, and the reprocessed image is assumed to be sRGB. If the original file was in Adobe RGB and its profile is stripped, the wider Adobe RGB colour values will be misinterpreted as sRGB values, producing desaturated, dull colours — the most common colour complaint about social media uploads. The solution is simple: always export sRGB for social media delivery. The sRGB values will be interpreted correctly even after the profile is stripped, because sRGB is the assumed default.

Converting Between Colour Spaces

Converting from a wider colour space to a narrower one (e.g., ProPhoto RGB → sRGB) requires a rendering intent to handle out-of-gamut colours — colours present in the wider space that the narrower space cannot represent. The two standard rendering intents are Perceptual (compresses the entire gamut proportionally, shifting all colours slightly to maintain relationships) and Relative Colorimetric (preserves in-gamut colours exactly and clips out-of-gamut colours to the nearest reproducible value). For photographic images with moderate colour saturation, Relative Colorimetric produces the most accurate result. For images with highly saturated colours that significantly exceed the destination gamut, Perceptual produces smoother transitions at the gamut boundary.

In Photoshop, colour space conversion is done through Edit > Convert to Profile. Select the destination profile (sRGB IEC61966-2.1 for web, Adobe RGB (1998) for professional print), choose the rendering intent (Relative Colorimetric for most work), and check "Use Black Point Compensation" (which maps the source black to the destination black, preventing shadow details from being lost during conversion). In Lightroom, the conversion happens automatically during export based on the colour space selected in the export dialog. In both applications, the conversion is a mathematical remapping of colour values that preserves the visual appearance of the image as closely as the destination gamut allows — it is not a destructive operation, and the visual difference between a carefully converted image and the original is typically imperceptible.

Practical Colour Space Workflow Summary

The optimal colour space workflow for most photographers is: shoot RAW (no colour space is baked in — the RAW file contains the sensor's native colour data), edit in Lightroom (which handles colour internally at maximum quality) or Photoshop set to ProPhoto RGB at 16-bit, and export to the correct colour space for each delivery destination: sRGB for all screen delivery (web, social media, email, client galleries), Adobe RGB for professional print delivery (when the lab requests it), and ProPhoto RGB only for archive TIFFs that you may re-edit in the future. This workflow preserves maximum colour data throughout processing and delivers files optimised for each destination — ensuring accurate, consistent, vibrant colour everywhere your photographs appear.

For camera JPEG shooters (who don't have the RAW latitude), set the camera's colour space to sRGB for social media and web-focused work, or Adobe RGB for print-focused work. If creating both screen and print deliverables, shoot Adobe RGB and convert to sRGB for screen delivery — converting from wider to narrower is safe, while converting from narrower to wider doesn't recover any colour data. When in doubt, sRGB is always the safe choice — it will look correct on every device, and the gamut difference versus Adobe RGB is only visible in highly saturated greens, cyans, and some blues, which are uncommon in most photographic subjects.