Difference between revisions of "Glossary"

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*:*In babl: marks a color channel to be premultiplied with alpha, for instance RaGaBa is premultiplied alpha RGB
 
*:*In babl: marks a color channel to be premultiplied with alpha, for instance RaGaBa is premultiplied alpha RGB
 
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*'''Alpha''' - opacity. An alpha value of 0 means 'transparent', an alpha value of 100 means 'fully opaque', values in between mean 'partly opaque'.
  
 
==B==
 
==B==

Revision as of 20:59, 3 January 2014

This glossary holds definitions important for the GIMP development. These include functional definitions i.e. from computer graphics and color theory, terms from BABL and GEGL etc.


Table of Contents

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

References

A

  • A (uppercase) -
    • The alpha channel in a color model, for instance in RGBA.
    • In babl the alpha value in a color model. If combined with alpha-premultiplied color channels: the alpha value each color channel R, G, B was multiplied with to achieve Ra, Ga, Ba. Needed to get from RaGaBa back to RGB. The same applies to R'aG'aB'aA, YaA, Y'aA.
  • a (lowercase) -
    • The axis in the CIELAB color space which denotes the magenta-green component of the image. One end of the axis is green and the other end red. Combined with the b axis, you can describe the hue and saturation of a color.
    • In babl: marks a color channel to be premultiplied with alpha, for instance RaGaBa is premultiplied alpha RGB
  • Alpha - opacity. An alpha value of 0 means 'transparent', an alpha value of 100 means 'fully opaque', values in between mean 'partly opaque'.

B

  • babl - a dynamic, any to any, pixel format translation library. (Website)

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

References