File:RGB profiles of the color palette.gif
Summary
| Description | Standard color gradient made in Gnuplot : black-blue-red-yellow |
| Source | self-made using Gnuplot |
| Author | Adam majewski |
| Other versions |
|
![](./File:Gnuplot_color_gradient_RGB_defined_(_0_"red",_0.5_"yellow",_1_"green"_).png)
Gnuplot source code
set terminal gif set output 'p.gif' test palette
It means:
set palette rgbformulae 7,5,15
so
R=sqrt(x)
G=x^3
B=sin(360x)
C code
/* this is part of code which shows how to get above gradient */
unsigned char color[3]; /* array */
double psin(double position)
{/* gives only positive values of sin because 0<=position<=1 */
if (position<0.5) return sin(position*2*3.14);
else return 0;
}
/* */
for(iY=0;iY<iYmax;++iY)
{
position=(double)iY/iYmax;
/* compute pixel color (24 bit = 3 bajts) */
color[0]=(int)255*sqrt(position);/*color.R */
color[1]=(int)255*position*position*position;/*color.G*/
color[2]=(int)255*psin(position); /*color.B/
}
See also other images of color gradients
Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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