Color Spaces

We can see how there is much more color information available in the Prophoto RGB color space thatn in the smaller Abobe RGB or sRGB color spaces the red areas represent "out of gamut" colors in the AdobeRGB and sRGB examples

Color Space.
-This is just a way of referring to the collection of colors/shades that are described by a particular color profile. Put another way, it describes the set of all realizable color combinations. Color spaces are therefore useful tools for understanding the color compatibility between two different devices.
-A color space is a conceptual tool for understanding the color capabilities of a particular device or digital file. When trying to reproduce color on another device, color spaces can show you weather you will be able to retain shadow/highlight detail, color saturation and by how much it will be compromised

-A color space relates numbers to actual colors and is a three dimensional object which contains all realizable color combinations, each direction in a color space represents some aspect of color such as lightness, saturation or purity or hue, the wavelength that appears to be most dominant.
-Working spaces are used by image editing programs and file formats to constrain the range of colors to a standard palette. Two of the most commonly used working spaces in digital photography are Adobe RGB 1998 and sRGB IEC61966-2.1. sRGB is a color space proposed by HP and Microsoft becuse it approximates the color gamut of most common computer display devices. It has become the standardized color space for displaying images on the internet. sRGB’s color gamut encompasses 35% of the visible colors specified by the CIE
-Adobe RGB was designed by adobe to encompass most colors achievable on CMYK printers but using only RGB primary colors on a device such as your computer display. The Adobe RGB 1998 working space encompasses roughly 50% of the visible colors specified by CIE improving on sRGB primarily in the cyan-greens