Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
What is an image? |
A rectangular grid of pixels or "picture elements" |
|
Raster image |
A grid of pixels |
|
Greyscale Raster images: |
0: black 100: white Etc. |
|
Rgb colour model |
Additive - all colours mixed make white Red Green Blue |
|
Pixel |
Rgb sub pixels |
|
CMY |
Printing mixing these produce black |
|
CMY model |
subtractive- gives us a way to mix colours using pigment |
|
CYMK |
CMY create an imperfect black and colour ink is expensive and can lead to blurring so we introduce K a black ink |
|
Printing with CYMK |
created by mixing lots of different sized dots to create RGB Y+C=G C+M=B |
|
RGBA |
the alpha channel declares how transparent something is 100% fully opaque 0 = fully transparent |
|
supported file types |
BMP |
|
Not supported file types |
JPEG |
|
Colour Depth/Bit Depth |
The amount of bits used to store the colour of a pixel 1 bit - monochrome 8 bit - 256 colours 24 bit - 16 million colours (true colour) |
|
storing pixels |
first 8 bits is R final 8 is B |
|
banding |
insufficient colour depth leads to banding - can be used as an artist effect called posterization |
|
gamut |
the amount of colours that can be represented by each model |
|
CYMK VS RGB |
far smaller gamut RGB images that when printed using CYMK can look muted |
|
pixel resolution |
the amount of pixels in an image |
|
spatial resolution |
the relationship between physical size of image and pixel dimensions 300dpi is photo quality at arms length |
|
aspect ratio |
the relationship between width:height |
|
HSV Colour model |
RGB & CYMK aren't intuitive for colour picking - hard to estimate RGB of a colour - changes to hue or brightness can require all RGB values to change |
|
HSV |
Hue 0-360 Saturation % amount of grey Value (brightness) % brightness or intensity in conjunction with saturation |
|
Hue |
0-60 R 60-120 Y 120-180 G 180-240 C 240-300 B 300-360 M |