Manipulating images ... color problems

[k89mmmk]

I'm trying to figure out how all the image manipulation functions work. here's the code I've got so far:

    header("Content-type: image/jpeg");
    $string = $_GET['toName'];
    $im     = imagecreatefromjpeg("button.jpg");
    $px     = (imagesx($im) - 7.5 * strlen($string))/2;
// imagecolorallocate (image, red, green, blue)
    $black1 = imagecolorallocate($im, 0, 0, 0);
    $white1 = imagecolorallocate($im, 255, 255, 255);
// Set background color of im2
    imagefill($im, 0, 0, $white1);
// imagestring(image, font, x, y, string, color)
    imagestring($im, 4, $px, 100, $string, $black1);
    imagejpeg($im);				
    imagedestroy($im);	

Its my understanding that this should take my image button.jpg, fill the background with white, and write black text. Instead, its filling with an orangy-brown color (r:215, g:188, b:145 according to my paint program). When I take out the imagefill line, I can see that its writing the text with this same orangy-brown color. Any ideas??

[barand]

I don't know for sure ( = just guessing) but it may have something to do with the jpg color palette. You could try [man]imagecolorresolve[/man] to find the colour you want in the palette

hth

[crosbystillsnas]

you might also get the right colors working with 2 images.

header("content-type: image/jpeg");

$image = "test.jpg";

// make an image from an existing one
$src = ImageCreateFromJpeg($image);
$src_dim = getImageSize($image);
$src_height = $src_dim[0];
$src_width = $src_dim[1];

// make a blank image with white background
$dest = ImageCreate($src_width, $src_height);
$dest_white = ImageColorAllocate($dest, 255, 255, 255);
$dest_black = ImageColorAllocate($dest, 0, 0, 0);

// copy $src to $dest
ImageCopy($dest, $src, 0, 0, 0, 0, $src_width, $src_height);

// write text on $dest
$px = ($src_width - 7.5 * strlen($_GET['string']))/2;
ImageString($dest, 4, $px, 100, $_GET['string'], $dest_black); 

ImageJpeg($dest);
ImageDestroy($dest);
ImageDestroy($src);

as barand said before, if you load an image, only the color palette of that image is loaded. creating a new image you can allocate different colors. and as barand also said, i am not sure either... but it looks like it works.

[k89mmmk]

Works great! Thanks alot!

(one small correction in case someone else copies this code: it should be

$src_height = $src_dim[1]; 
$src_width = $src_dim[0]; 

not

$src_height = $src_dim[0]; 
$src_width = $src_dim[1]; 

)