If you are used to preparing images in Adobe Photoshop or Adobe Lightroom using Adobe RGB or ProPhoto RGB color profiles, you have probably been preparing images for consistent print quality.
To prepare your images for consistent display quality you’ll need to convert files to the sRGB color profile.
What is a Color Profile
The International Color Consortium (ICC) has a standard for an ICC Profile that defines the rules for managing color on input devices (such as cameras and scanners) and output devices (such as printers and monitors).
Here are some key color profiles you need to know about:
- Adobe RGB and ProPhoto RGB: Color profiles used in Adobe Photoshop and Adobe Photoshop Lightroom – primarily for preparing images for print.
- sRGB: the color profile used by most web browsers to display images on the web.
Mixing color profiles can lead to washed out / dull images
If you take an image with either an Adobe RGB or ProPhoto RGB color profile and display it in a web browser, the colors may look washed out or dull.
To avoid this occurring, convert the image to sRGB format before it is displayed in a web browser.
*Note: Safari has for some time supported the color profile recorded for an image. Firefox 3.5.2 (Aug 09) introduced standard support for ICC color profiles.
Converting the color profile to sRGB
If you have images with the Adobe RGB or ProPhoto RGB color profile, to convert them to sRGB:
- In Adobe Photoshop – see detailed instructions and screenshots below
- In Adobe Lightroom, choose File, Export and set the Color Space to sRGB.
After you have converted the image to sRGB, check that the colors are the way you want them.
Exporting files with ICC Color Profiles
In Photoshop you can choose to include or exclude the ICC color profile metadata when you choose Save As to save an image for the web. Note this only affects whether the file is ‘tagged’ with the color profile – the colors embedded in the image remain the same.
There are pros and cons to leaving the color profile off. Leaving the ICC color profile off can result is potentially a better option for images on the web:
- the file size is slightly smaller.
- you may avoid problems with untagged sRGB files being displayed differently to tagged sRGB files.
If you want to find out more about color profiles and the rationale for using sRGB for your web images, here are some links:
- Web Browser Color Management Tutorial, by Greg Ballard
- Embedding Tagging ICC Profiles in Web Images, by Greg Ballard
- Digital Image Color Spaces by Jeffrey Friedl
- Web Browser Color Management Guide and Color Management Test by Fabio Pili of Gear Oracle