Formation point processing Flashcards
What is resolution?
The dimensions by which you can measure how many pixels are on a screen.
What is the intensity range?
0-255
What intensity is 0?
Black, no light intensity
What intensity is 255?
White, very bright
Why do RGB values go up to 255?
- RGB values go to 0-255 this is because each colour channel is represented by 8 bits = 1 byte.
- The maximum number 8 bits can represent is 255 (eight ones in a row).
How are image files stored?
In binary on computers
How many binary digits does it take to represent one pixel?
24 binary digits
Why is the hexadecimal number system used?
Image files are stored in binary on computers but this takes 24 binary digits to represent just one pixel so digital artists often use a hexadecimal number system to represent colours.
How can you alter the colour of an image?
Change the RGB value
How many values are there per pixel in a colour image
3 - red, green, blue
What does point processing do?
Pixel value
Point processing adjusts a pixel value according to a transformation function usually for the purpose of improving the perceived image quality.
What does point refer to?
Pixel
What does point processing allow you to do?
- Adjust brightness and contrast
- Gamma correction
- Histogram equalization
- Colour correction
What is an image histogram?
An image histogram simply records the number of pixels within an image at each light intensity value and is displayed as a bar chart.
