Accessing palette in GD using C

rubadub · 03-13-2008, 02:55 PM

Hi, I have some PHP code which I can use but I can't seem to find the equivalent code in C. Here's the code from the PHP manual:

Code:

// get a color
$start_x = 40;
$start_y = 50;
$color_index = imagecolorat($im, $start_x, $start_y);

// make it human readable
$color_tran = imagecolorsforindex($im, $color_index);

Basically i'm after any way to read out the palette (index + colour), cross reference colours, or just return the palette index from a position.

I'm looking through gd.h but seem unable to find the appropriate function(s), any suggestions appreciated!

rubadub · 03-13-2008, 03:08 PM

Well, it's not a function but by directly accessing the structure I can do what I want...

Code:

c = img->pixels[3][3];
printf("c: %d -> colour: %d, %d, %d \n", c, img->red[c], img->green[c], img->blue[c]);