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Posted by William Gill on 08/30/07 14:25
>
> <http://nl3.php.net/imagecolorat>
>
> $im = imagecreatefromjpeg("/your/image/file");
>
> $pixels = array();
> for($x = 0; $x < imagesx($im); $x++){
> for($y = 0; $y < imagesy($im);$y++){
> $rgb = imagecolorat($im, $x, $y);
> //either:
> $pixels[$x][$y] = imagecolorsforindex($im,$rgb);
> //or:
> $r = ($rgb >> 16) & 0xFF;
> $g = ($rgb >> 8) & 0xFF;
> $b = $rgb & 0xFF;
> $pixels[$x][$y] = array($r,$g,$b);
> }
> }
>
Thanks, Rik.
I played with imagecolorat() before, but it didn't seem to work with a
non indexed color image (i.e. it worked with a gif, but not a jpeg).
Reading the spec seemed to confirm that the function returns the color
index (not the color), which can then be read for rgb values. I was
able to convert the jpeg to an indexed image, then use imagecolorat(),
but it meant reducing the original to 256 colors first.
I will try again, using your snippet, and let you know.
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