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We tried to group together the more usual questions we receive about using and interpreting this site data and services. These FAQs are all related to the EasyRGB site and the way we specifically handle color information. If you are searching for more generic information about color, on the Net there are several good sites devoted to color science, physics, psychology, physiology and technology. Check our Links page for a list of handy color FAQ references.

What can I do using the services of this site?

How accurate are on-screen colors?

How are color standards measured?

How color measures are stored in the EasyRGB database?

Where a physical sample of the color is available we store the spectral reflectance curve measured with a bench spectrophotometer. Where no physical example is available (for example Netscape colors) we store the original RGB values.
These are the most important parameters we use in the process:
Spectral data = From 380 to 720 nm in 10 nm channels
XYZ Illuminant = D65 (Daylight)
XYZ Observer = 2 degrees (CIE 1931)
RGB Conversion = Compressed sRGB/Rec.709
We chose the 2 degrees observer because of the sRGB recommendation even if we consider the 10 degrees observer a better choice for this specific application.


How is the closest color (best match) calculated?

Why HLS/HSL/HSB/HSV data is not supported?

Is any gamma correction applied to the displayed colors?

Why is a 45 (not a sphere based) spectrophotometer used?

Is possible to add a new color collection to the color matching list?

What is the required color resolution for this site?

Is any compatibility problem associated with old browsers?

Why printed colors are not consistent with my monitor?