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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
Used by printers to print pixels onto paper

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+M=R


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
PNG
TIFF

Not supported file types

JPEG
GIF (set one colour to be background colour)

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
next 8 is G


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
DPI (printers)
PPI ( monitors)


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