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选修2多媒体技术应用《4.1.3颜色模型》公开课PPT课件优质课下载
The colour which we perceive is the qualification of the light, emitted by the light source or reflected off the lit-up object. This is therefore the function of the nature of the light source and of the nature of the lit-up object.
Artists who paint are familiar with the mixing of colours and know that if a blue and a yellow are mixed on a sheet of white paper, a green will be obtained.
Subtractive synthesis is the mixing of colourant materials which absorb part of the light energy reflected by the coloured area. There are three primary colours:
Red - Yellow - Blue
Mixing of two primary colours gives the result of a secondary colour;
- Red + Yellow = Orange
- Yellow + Blue = Green
- Blue + Red = Purple
This is the process used in aquarelle painting, etc... This is what especially interests us.
Around the Globe
Designates color - is it Blue, Red, Yellow,
Green or shades in between.
The color wheel reads BRYG
Blue - Red - Yellow - Green
This corresponds to the colour's position in the spectral range
Top To Bottom
The amount of black or white (or aluminum-if metallic) in a color.
The top is White and the bottom is Black
The tone or reflection corresponds to the colour's position in the shade, in relation to the neighbouring simple colours. For example:
- blue + purple or blue + green
The clarity or height of tone this corresponds to the colour's position in relation to the degree of clarity or darkness.
(More white = lighter, more black = darker Chromatic cylinder)
Inside - Out
Is the color Clean or Dirty, Saturated or
De-saturated?