[Gnuplot-info] plotting rgb images

[Martin B. <m.b...@st...>]

Hello,

I want to plot images with gnuplot 4.2.4-6.
I wrote a small C program that extracts RGB values for each pixel and
stores it to a ASCII-file which should be supported.
The first column is the x-position, the second the y-position, the rest
are the rgb values:
0 0 255 255 255
1 0 255 255 255
2 0 255 255 255
3 0 255 255 255
4 0 255 255 255
5 0 255 255 255
6 0 255 255 255
7 0 255 255 255
8 0 255 255 255
9 0 255 255 255
...
The first pixels are all white.
First question: Should I use a range from 0 to 255 or from 0 to 1?

Second question: How can I now plot that data?
In the demo scripts I can only find examples with binary data.
I tried many options similar to:
plot 'image.rgb' format='%uchar%uchar%uchar' using ($3+$4+$5) with
rgbimage
and
plot 'image.rgb' array=(1852x917) with rgbimage
when using implicit xy-coordinates (without the first columns).

I'm sure someone can point me to the solution.

Thanks for your help!

Martin