A color model is a system that creates a full range of colors from a small set of primary colors. There are two main types of color models: additive and subtractive. Additive color models like RGB use light to display colors on screens by combining red, green, and blue light, starting with black and ending with white. Subtractive color models like CMYK use pigments to print colors, starting with white and ending with black by combining cyan, magenta, yellow, and black inks. RGB is used for digital displays while CMYK is used for print because it reflects how inks absorb and reflect light.

1. Color Model
Presented By:
Md. Asif Shahariar
Shovan Banik
Iftekher Aziz
162-15-7772
162-15-7790
162-15-8182

2. A color model is a system for creating a full range of
colours from a small set of primary colors.
What is Color Model?

3. Tristimulus Color Space

4. CIE XYZ Color Space

5. Additive Color Models
Additive color mixing is
creating a new color by a
process that adds one set of
wavelengths to another set
of wavelengths.

6. Additive Color Models Con.
If we are working on a computer:
• The colors we see on the screen are created
with light using the additive color method.
• Additive color mixing begins with black and
ends with white.
• AS more color is added, the result is lighter
and tends to white.

7. Subtractive Color Models
Subtractive color mixing occurs when
we mix paints, dyes, or pigments.
Subtractive color mixing occurs when
we mix paints, dyes, or pigments

8. Subtractive Color Models
Con.
When we mix colors using paint:
• We use subtractive color method.
• Subtractive color mixing means that one
begins with white and ends with black
• As one adds color, the result gets darker and
tends to black

9. Cylindrical-coordinate Color
Model
A number of color models exist in
which colors are fit
into conic, cylindrical or spherical s
hapes, with neutrals running from
black to white along a central axis,
and hues corresponding to angles
around the perimeter.

10. RGB Color Model
• Additive Color Model
• For Computer Display
• Uses light to display color
• Colors result from transmitted light
• Red + Green + Blue = White

11. RGB Color Model Con.
• The RGB Colors are light primaries and colors are created
with light
• Percentages of Red, Green & Blue are used to generate
color on a computer screen.

12. Importance of RGB Color
Model
• Used in hardware applications like PC monitors, cameras
and scanners.
• It is used for Web graphics, but it cannot be used for print
production.
• It directly reflects the physical properties of “True-color”
displays.

13. Importance of RGB Color
Model Con.
• It also used in sensory representation
• Display of text images in electronic system (Computer, T.V.,
Camera)

14. CMYK Color Model
• Subtractive Color Model
• For Printed Material
• Uses ink to display color
• Colors result from reflected light
• Cyan + Magenta + Yellow = Black

15. Importance of CMYK Color
Model
• The CMY color model is used in color printers.
• It is created by the subtractive model.
• Used in most commercial color printing.(Books, Magazines
etc.)

16. Numeric representation
• A typical RGB color selector in graphic software Each slider
ranges from 0 to 255.
• Hexadecimal 8-bit RGB representation of the main 125
colors.
• A color in the RGB color model is described by indicating
how much of each of the red, green and blue is included

17. Numeric representation Con.
• If all the components are at zero the result is black
• If all are at maximum, the result is the brightest represent
able white.

18. Conversion Policy RGB to
CMYK
• The R, G, B values are divided by 255 to change the range
form 0.255 to 0.1
• R = R/255
• G = G/255
• Y = Y/255

19. Conversion Policy RGB to
CMYK
• K = 1 – max (R, G, B)
• C = ( 1 – R – K ) / ( 1-K)
• M = ( 1 – G – K ) / ( 1-K)
• Y = ( 1 - B – K ) / ( 1-K)

20. Difference between RGB &
CMYK

21. Difference between RGB &
CMYK
• RGB is an additive type of
color mode
• That combines the primary
colors
• RGB is vibrant
• All three colors are combined
it will pure white
• CMYK is a four-color mode
• Combines cyan, magenta,
yellow and black
• Not vibrant but good for
reading
• Not pure black, but rather a
very dark brown

22. Thank You