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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?

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?

In our lab we use a 45° spectrophotometer basically for 2 reasons:
1. We consider this geometry able to provide measures closer to human color perception. Specially with color samples characterized by different glosses, is always possible to have consistent chromatic correlation throughout our database
2. Our color database is a very important asset for our company. With 45° readings we can realistically migrate data from one instrument to another, multi-calibrate heads and apply correction factors. If it's a difficult task to convert color data from a 45° instrument to another, the same task is almost impossible between sphere based instruments.


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?