Yeah, I had the idea with truecolor, but I do not have GD2 installed. I
have to install it, first.
Still, I do not understand! I only have 13 colors, why is allocating only
255? I am not using the indexes in the color allocation.
Thanks.
On Mon, 3 Feb 2003, Pierre-Alain Joye wrote:
> On Sun, 02 Feb 2003 14:36:38 -0800 (PST)
> Mihail Bota <mbota@almaak.usc.edu> wrote:
>
> > No, this is not the problem. $i and $j start from 0, anyway. The real
> > problem, as I see it, is the following:
> > I have a big loop, to create something like a checkerboard, but with
> > 13 or so colors. If the loop iterates more than 256 times, then those
> > cells with indexes bigger than 255 (or 256, does not matter) will have
> > a single color: that of the 255th or 256th cell.
>
> Random color, you create a palette based image, which has only 256
> colors (0..255), the 1st allocated color is the backgroud color, you
> have only 255 colors to use, 1..255.
>
> You loop 16*16 (<17), you reached the maximum amount of color at the
> 16th iteration.
>
> You can easily solve your problem by using a truecolor image, make your
> script a little bit more efficient by allocating before the loop, and
> cleaner without the ugly if else endless test. Find a quick cleanup at
> the footer
>
> As a side note, an image of 500x400 means a horizantal ranges from 0 to
> 499 and a vertical range from 0 to 399.
>
>
> hth
>
> pierre
>
> <?php
> $image=imagecreatetruecolor(500,500);
>
> $white=imageColorAllocate($image,255,255,255);
>
> imageFilledRectangle($image,0,0,499,499,$white);
>
> $colors = array(
> imagecolorallocate($image, 255, 255, 0),
> imagecolorallocate($image, 255, 0, 0),
> imagecolorallocate($image, 255, 0, 100),
> imagecolorallocate($image, 255, 100, 100),
> imagecolorallocate($image, 255, 210, 100),
> imagecolorallocate($image, 0, 255, 255),
> imagecolorallocate($image, 0, 255, 200),
> imagecolorallocate($image, 0, 100, 255),
> imagecolorallocate($image, 0, 100, 200),
> imagecolorallocate($image, 200, 0, 0),
> imagecolorallocate($image, 0, 0, 138),
> imagecolorallocate($image, 0, 0, 255)
> );
>
> for ($i=0; $i<17; $i++) {
> for ($j=0; $j<17; $j++) {
> /* should be 0..11 to avoid the test */
> $qq=rand(0,13);
> if($qq && $qq<12){
> imagefilledrectangle($image,
> 7*$j,7*$i,7*$j+7,7*$i+7,$colors[$qq]);
> }
> }
> }
> header("Content-type: image/png");
> imagepng($image);
> imagedestroy($image);
> ?>
>
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