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Unformatted text preview: CS 445 / 645
Introduction to Computer Graphics
Color Assignment 3
Due March 23
• Fourth years plan for thesis collision
• We’ll provide lots of details to keep the assignment doable Morphing algorithm Last Class
We discussed vision physiology and
perception of gradients
Color representations Specifying Color
Color perception usually involves three quantities:
• Hue: Distinguishes between colors like red, green, blue, etc
• Saturation: How far the color is from a gray of equal intensity
• Lightness: The perceived intensity of a reflecting object Sometimes lightness is called brightness if the object is
emitting light instead of reflecting it.
In order to use color precisely in computer graphics, we
need to be able to specify and measure colors.
need Combining Colors
Shining colored lights
on a white ball Subtractive (CMYK)
Mixing paint colors and
illuminating with white light How Do Artists Do It?
Artists often specify color as tints, shades, and tones
of saturated (pure) pigments
• Tint: Gotten by adding white to a pure pigment,
• Shade: Gotten by adding
black to a pure pigment,
• Tone: Gotten by adding
white and black to a pure
Sha Pure Color HSV Color Space
Computer scientists frequently use an intuitive
color space that corresponds to tint, shade, and
• Hue - The color we see (red, green, purple)
• Saturation - How far is the color from gray (pink is less
saturated than red, sky blue is less saturated than royal blue)
• Brightness (Luminance) - How bright is the color (how bright
are the lights i...
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This note was uploaded on 01/23/2012 for the course CS 445 taught by Professor Bloomfield,a during the Spring '08 term at UVA.
- Spring '08
- Computer Graphics