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52 Cards in this Set

  • Front
  • Back
stochastic screens
random dot pattern for printing halftones through
frequency modulated screen
dots are varied by quantity to show gray values
amplitude modulated screens
dots are varied in size to show gray values
advantages of frequency modulated screen
better detail rendition, great for busy images
advantages of amplitude modulated screens
better wash detail, big blocks of colour
what is the screening system of the future
hybrid screens, which figure out where to use amplitude modulated and where to use frequency modulated
3 phases of cinema industry
capture, editing, displaying
resolution of digital display
how do fluorescent materials work
absorb radiation from outside the visible spectrum and convert it to visible radiation (usually UV)
What is CIELAB
cielab is a colour space based on lightness, hue, and chroma that is based on human perception with defined light source
Why is CIELAB important
it is what colour management profiles are based off of
what causes colour aliasing
interpolation errors - each pixel absorbs R,G, or B. it gets information on the other two colours from neighbours, so at sharp edges it can rainbow
works on the basis that oil repels water
cutting an image into the plate, then applying pressure to paper to get ink out from the incisions
flexography (flexo)
used for printing on uneven surfaces, the background is cut away. it is used for packaging, cardboard, etc. mounted on rotary press. pattern made out of rubber so it kisses the substrate
a form of intaglio, transferred to a rubber blanket and wrapped around a rotary press
cutting away the background
pad printing
a process for printing on bizarre surfaces (golf balls, keyboard keys, etc)
How do you separate green, blue, and red
red goes to cyan, green goes to magenta, blue goes to yellow
what are the 3 original printing methods
platten press, cylinder press, rotary press
offset press
a form of rotary press where the cylinders are offset from each other to aid in applying ink (used for litho offset)
is there a scientifically perfect colour separation
no, its what the client decides looks right
colour electronic prepress system
invented in 1980, text, image, colours, effects, can be done in computer for the first time instead of by hand
why is the laser so important
the laser allows light to be very absolute, either on or off. hard dot images, no graying out like normal light through a screen
two types of scanners
flatbed and drum, drum is higher res
two types of colour correction
global correction and selective correction
what is the difference between script and cursive
script, ends touch
what is more profitable, CCD or CMOS
CMOS, used in cellphone cameras, small displays, etc
what dimension are colour gamuts
3D spaces, with variance across ability to replicate grayness, lightness, and hue
what are examples of input, display, and output devices as per digital media
scanners/digicams, monitors, printers/websites
why do scanners see differently from people
people have bias, where they will automatically correct colours in their mind. scanners on the other hand compare colours to a target profile (calibration is key)
what are the 3 steps to setting up a scanner or digital camera for image capture
calibration, characterization, conversion
what is the primary reason why lasers are so precise
lasers emit one wavelength of light in step (no interference)
what is the light temperature of CIE's standard illuminant (which CIELAB is based off of)
5000 degrees kelvin, because it is similar to daylight
what is the different usage for additive and subtractive colour
additive is used for capturing colour separation (RGB), subtractive is used for printing (CMYK). this is why ccd arrays have RGB pixels and printers have CMYK ink
3 properties of halftone printing
dot shape, screen angle, screen ruling
How do you measure the amount of gray values available given dpi and lpi
(dpi/lpi)^2 + 1 = number of levels
did gutenberg invent movable type
no, he just made it easier, enabling mass production of books
when were halftone screens invented
1860, fox talbot
what is the rule of thumb for appropriate scanning resolution at 1:1?
scanning resolution should be 2x the line per inch. method for figuring out enlargment problems goes lpi*2*(pct blown up/down / 100)
screen ruling where an average observer at a distance of 15" can no longer detect halftone/moire is?
150 lines per inch. usually dpi is atleast 10x lpi.
what is screen build
building a specific colour by printing percentages of cmyk over each other
What color has to be printed on a 90 degree screen angle, and why?
[ideal separation is 30 degrees.. but then only 3 can fit on the screen so for a 4th you can squeeze in a 15 degree angle.] YELLOW has to be on a 90 degree angle. We are less sensitive to different hues than yellow. black is at 45, and cyan and magenta are at off angles. this makes a rosette pattern instead of bizarre interference
what is a linotype machine
a machine that automatically sets type
what is stereotyping
setting type on heat and onto a mat that can be wrapped around a cylinder
what is trapping
trapping is ensuring that two adjacent colours are adjusted so that any misalignment does not result in white gaps between the two inks. this is not necessary in some instances where both colours share components
what are ligatures, kerning
ligatures are letter pairs that come pre-kerned. kerning is moving letters closer together to enhance readability
what is leading
distance between letter lines from baseline to baseline
what is x-height, hinting
height of a lowercase letter with no ascender/descender. hinting is digital hints on how to display letters when made tiny
what is typeface, what is font
typeface is the entire collection of one style of fonts at different pt sizes, font is one specific set
what is a pt, what is a pica, what are they used for
points are 1/72 of an inch, they measure type height. pica are 1/6 of an inch, they measure the length of a line, start to finish
what is better for word recognition, what is better for reading passages
sans serif, serif