Colour Flashcards
What is an additive colour model?
As the values increase on the graph the colour increases.
What is the CMY colour model used for?
Printing
What does HSV stand for?
Hue = colour of the value
Saturation = saturation of the colour (0-1)
Value = intensity of the colour
What is the HSV model good for?
User interaction, colour picker in paint.
Histogram equalization.
What is a lookup table?
An array that holds values which would otherwise need to be calculated.
Why are lookup tables good?
When the values are needed the program can look them up instead of calculating them, saving computational resources
When do we use look up tables?
- For a costly function where we know the precision in advance
- When a function has limited input value
What is the process of look up tables?
- Compute the function for every possible input
- Store it in the input table
Why are look up tables good for Gamma correction?
Gamma correction calculations involve a costly power function and therefore can be avoided for larger images. Reduces the time it takes to produce the image.
