2.4 Images Flashcards
What are some different ways you can store images?
- BMP
- JPG
- GIF
- PNG
- TIFF
- SVG
- AI
- PS
Give some bitmap image formats
- BMP
- JPG
- GIF
- PNG
- TIFF
Give some vector image formats
- SVG
Give some editing formats
- AI
- PS
What are Bitmap images made up of?
Picture Element (pixels)
What is a pixel?
The smallest identifiable area of an image
What is each pixel assigned?
A colour which is represented by a binary value
How can a pixel’s colour be changed?
Changing the value
What is image resolution?
The concentration of pixels within a specific area
What is the area in resolution?
The amount of pixels in the width and height of an image
What is the typical screen resolution?
72 PPI (Pixels Per Inch)
What is the typical print quality resolution?
300 DPI (Dots Per Inch)
What resolutions do modern smartphones have?
300+ PPI
What does more bits per pixel mean?
More colour combinations
What is the formulae that dictates the amount of combinations of colours
2^n where n is the amount of bits
How does the number of colours and size of the image affect file size?
They both increase the file size
What are PBM monochrome images
Image dimensions and colours are represented in a matrix like bit pattern
What is each pixel made up of on a screen?
RGB values
Why is hexadecimal used instead of binary for RGB values?
They use numerical values and hex as they are easier for people to read and remember which can reduce errors
What is the range of values that can be stored in RGB?
0-255
If the range of values that can be stored in RGB is 25, how many bits would you need to store that colour?
8
How many bits are required to store the whole pixel with RGB values?
3*8 bits = 24 bits (16.8 million colours)
In 32-bit colour, what are the last 8 bits for?
Given to a transparency channel (to allow a background to show through)
What is bit depth?
Bit depth is the number of bits available for each sample . The higher the bit depth, the higher the quality of the audio.
Why can there be a file difference size of the file from the normal image and when it is stored?
Meta data
What is metadata?
Data about data
What can be stored in metadata of an image?
Colour depth
Resolution
Date created
Author
