Emission Vs. Reflection of Light
Photography is all about capturing photons.
[Directly Emission]: Light sources such as the sun, a
lamp a computer monitor, send out waves of photons (minute energy packages,
particles without a mass)
[Indirectly Reflection]: We see things other than light
sources, indirectly through reflection.
Dark surfaces will absorb most of the incoming light
while the bright surfaces will reflect most of it.
A RED object let say red rose will absorb the green and blue components
of light and only reflects RED light.
A monitor creates RED light by turning off green and
blue color and leaving RED on
Additive RGB Colors
Colors of light sources, such as LCD, is described
with RGB colors.
Combining all additive primary colors will generate "WHITE".
Subtractive CMYk Colors
CMYk: Cyan Magenta Yellow and Black
Colors of light reflecting objects are described with
CMYk colors.
Combining primary subtractive colors will generate "BLACK".
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| LAB Color Space |
LAB Color Spaces (Visible Color Space)
Image reproduction devices (monitor, printer etc) are
unable to produce all visible colors.
sRGB: Standard RGB (monitors)
CMYk: Cyan Magenta Yellow and Black (Printers)
Hue
We could reshape LAB diagram into an hexagon.
Corners containing primary colors and complementary
colors.
Orange is in between Red and Yellow.
Each color on the hexagon (or color wheel) is a "Hue".
It is defined by its angle in counterclockwise.
Yellow is 60 degree and combination of Pure Red and
Pure Green.
Here is how pure yellow is generated.
60 degree Hue.
Full saturation and full brightness.
In other way;
That makes only combination of pure RED and pure GREEN but no BLUE component.
60 degree Hue.
Full saturation and full brightness.
In other way;
That makes only combination of pure RED and pure GREEN but no BLUE component.
If this had been a surface we could say RED and GREEN is fully reflected while BLUE is absorbed. That is the reflection of yellow.
Saturation
Mixing all primary additive colors will create WHITE.
White has 0% saturation, so called «de-saturated».
Brightness
Pure color has 100 % saturation around the edges of
hexagon and white has 0% saturation.
WHITE corresponds to 100% brightness while BLACK corresponds to 0%.
In between there are levels of gray.
Reducing saturation means increasing the amount of
gray.
As color gets darker, the difference between center
and edges becomes smaller.
Hue
Saturation
Brightness
Select a color component to generate a color
Yet another Color generator tool that is supporting similar color models to HSB. It also enable suitable colors to use in web design. Select a color see suitable others and decide background, foreground, text color etc.
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