Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

A note of color

No description
by

Guillermo Amaral

on 28 November 2016

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of A note of color

G
R
B
color
test
real case
CIE-LAB
model
space
tuple: (a, b, c, ...)
a note of
c
o
l
o
r

YUV
(1, 0, 0)
implementation
LABColor
Color
XYZColor
RGBColor
HSVColor
HSLColor
HSColor
color assignment
case 1
assign colors by applying rules
rule: "oil curves should be green"
case 2
chose n "different" colors
distant enough?
uniform changes of L*a*b* components correspond to uniform changes in perceived color
how to measure the difference?
C1
C2
eD =
2
(r1 - r2) + (g1 - g2) + (b1 - b2)
(r1, g1, b1)
(r2, g2, b2)
2
2
-b
+b
-a
+a
L
what is the minimum distance such that two colors can be distinguishable?
is this distance uniform?
color solid
(0, 0, 255)
(20, 20, 255)
eD ~ 21
eD =
2
(l1- l2) + (a1 - a2) + (b1 - b2)
2
2
-b
+b
-a
+a
L
C1
C2
(l2, a2, b2)
(l1, a1, b1)
eD ~ 2.3 corresponds to a JND (just noticeable difference)
classes
conversion
rgb
xyz
lab
approach
generate n colors using HSL / following rules
primary colors
lightness, hue, ...
additive
subtractive
emitting devices
capturing devices
RGB, CMYK, ...
CIE-XYZ, CIE-LUV, CIE-UVW, HSL, HSV, ...
RGB, ...
CMYK, ...
RGB, ...
CMYK (printers), RGB (displays)...
perceptually linear
not perceptually linear
test analysis
International Commission on Illumination
guille amaral
great
orange ball!
cones
retina
detect those undistiguishable using LAB
generate different tones of them using HSL
conclusions
2. benefits vs computational cost
1. just a use case
3. better ways to pick colors might prevent us from detecting color collision
based on 1931 CIE-XYZ model
smooth, uniform
Full transcript