Color
RGB Color Model
RGB – Red, Green and Blue is the Color Model (Mode) that is used for images that are displayed on any kind of screen: monitor, TV, video and digital cameras, scanners etc.
A large percentage of the visible color spectrum can be represented by mixing red, green, and blue colored light in various proportions and intensities.
When all three RGB colors illuminate with their highest intensity, together they generate the color white. If they illuminate with their lowest intensity they produce the color black. Here one refers to additive mixing of colors, as opposed to the subtractive mixing of colors, which is applied in the CMYK model.
Web Safe Colors
256 colors
8-bit
Initially web designers only used a limited palette of 256 colors which in fact was reduced to 216 when selecting colors that were common to both platforms. It is no longer necessary for web designers to be so restricted, very few if any of today's monitors are still have these limitations.
Web Smart Colors
4096 colors
16-bit
Web Smart Colors consist of a palette that includes 4096 colors. Once monitors started to display thousands of colors web designers had a lot more choice.
Unsafe Colors
Millions of colors
32-bit
Although today designers often choose to use the millions of colors palette, not all devices read millions of colors correctly.
CSS
The hex number for both web safe and web smart colors is represented in pairs. In the CSS the hex number can be represented using only one digit from each pair. Example: #669900 can be written as: #690.
and are not necessary a true match
Primary Colors
Green, Blue, Red
Secondary colors
Cyan, Yellow, Magenta
Secondary colors are created by combining two primary colors.
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The value for each color is between 0 - 255. When you are using an application such as Photoshop the combination of all three rgb colors is then assigned a hex number.
Color Chart
Photoshop's Color Picker
