QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Creating image palletes |
| Ref. No. |
QNX.000009896 |
| Category(ies) |
Development |
| Issue |
We are having difficulties figuring out how image palletes can be created. We have located a selection of palettes in /qnx4/photon/palette, but we do not know how to create one on our own.
Could you point us in the direction of a tool or utility for this?
Is there a way of extracting a palette from a particular image format?
|
| Solution |
Here is the solution for you:
Create a (truecolor) image in photoshop that is 256 pixels (or as many colors as you want) by 1 pixel high.
Save it as a 'raw' format image. This simply dumps the pixels to a binary file in RGBRGB format.
Next, you need to write a little program that converts that data into a photon palette that might look something like this:
Note: this code won't compile.
/************code**************/
void main(){
x09unsigned chr r, g, b;
x09PgColor_t rgb;
x09int in, out;
x09
x09in = open("input palette file", O_RDONLY);
x09out = open("output photon palette",O_WRONLY);
x09while(read(in, &r, 1) != -1 && read(in, &g, 1) != -1 && read(in, &b, 1) != -1){
x09x09rgb = PgRGB(r, g, b);
x09x09write(out, &color, sizeof(PgColor_t));
x09}
x09close(in);
x09close(out);
}
/*************************************/
Add more error checking and command line parameter parsing if you are going to use this many times.
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