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Image watermark feature
@ :: code ::
Feb 28 2003, 04:20 (UTC+0) | From:
ElfQrin :
This function adds a text into an image.
Supports JPGs and PNGs.
You need GD library to make it works (included in PHP since v4.3.0, but you have to enable it in php.ini)
You need a True Type (.TTF) font.
The hotspot feature is approximated.
Hot Spots:
1-2-3
4-5-6
7-8-9
0 = Free X/Y text coordinates.
Simple usage examples:
<IMG SRC="watermark.php?wmimg=image.jpg">
<IMG SRC="watermark.php?wmimg=image.jpg&wmtext=Hello%20World" BORDER=0 ALT="test image" TITLE="this is a test" ALIGN=LEFT>
Create a file called watermark.php with this content:
// watermark by Elf Qrin ( http://www.ElfQrin.com/ )
function watermark($img,$text="[date]",$datfmt="Y-m-d",$font="ARIAL.TTF",$font_size=12,$rgbtext="FFFFFF",$rgbtsdw="000000",$hotspot=8,$txp=0,$typ=0,$sxp=1,$syp=1) {
$suffx=substr($img,strlen($img)-4,4);
if ($suffx==".jpg" || $suffx=="jpeg" || $suffx==".png") {
$text=str_replace("[date]",date($datfmt),$text);
if ($suffx==".jpg" || $suffx=="jpeg") {
$image=imagecreatefromjpeg($img);
}
if ($suffx==".png") {
$image=imagecreatefrompng($img);
}
$rgbtext=HexDec($rgbtext);
$txtr=floor($rgbtext/pow(256,2));
$txtg=floor(($rgbtext%pow(256,2))/pow(256,1));
$txtb=floor((($rgbtext%pow(256,2))%pow(256,1))/pow(256,0));
$rgbtsdw=HexDec($rgbtsdw);
$tsdr=floor($rgbtsdw/pow(256,2));
$tsdg=floor(($rgbtsdw%pow(256,2))/pow(256,1));
$tsdb=floor((($rgbtsdw%pow(256,2))%pow(256,1))/pow(256,0));
$coltext = imagecolorallocate($image,$txtr,$txtg,$txtb);
$coltsdw = imagecolorallocate($image,$tsdr,$tsdg,$tsdb);
if ($hotspot!=0) {
$ix=imagesx($image); $iy=imagesy($image); $tsw=strlen($text)*$font_size/imagefontwidth($font)*3; $tsh=$font_size/imagefontheight($font);
switch ($hotspot) {
case 1:
$txp=$txp; $typ=$tsh*$tsh+imagefontheight($font)*2+$typ;
break;
case 2:
$txp=floor(($ix-$tsw)/2); $typ=$tsh*$tsh+imagefontheight($font)*2+$typ;
break;
case 3:
$txp=$ix-$tsw-$txp; $typ=$tsh*$tsh+imagefontheight($font)*2+$typ;
break;
case 4:
$txp=$txp; $typ=floor(($iy-$tsh)/2);
break;
case 5:
$txp=floor(($ix-$tsw)/2); $typ=floor(($iy-$tsh)/2);
break;
case 6:
$txp=$ix-$tsw-$txp; $typ=floor(($iy-$tsh)/2);
break;
case 7:
$txp=$txp; $typ=$iy-$tsh-$typ;
break;
case 8:
$txp=floor(($ix-$tsw)/2); $typ=$iy-$tsh-$typ;
break;
case 9:
$txp=$ix-$tsw-$txp; $typ=$iy-$tsh-$typ;
break;
}
}
ImageTTFText($image,$font_size,0,$txp+$sxp,$typ+$syp,$coltsdw,$font,$text);
ImageTTFText($image,$font_size,0,$txp,$typ,$coltext,$font,$text);
if ($suffx==".jpg" || $suffx=="jpeg") {
header("Content-type: image/jpg");
imagejpeg($image);
}
if ($suffx==".png") {
header("Content-type: image/png");
imagepng($image);
}
imagedestroy($image);
}
}
if (isset($wmimg)) {
if (!isset($wmtext)) {$wmtext="[date]";}
if (!isset($wmdatfmt)) {$wmdatfmt="Y-m-d";}
if (!isset($wmfont)) {$wmfont="ARIAL.TTF";}
if (!isset($wmfont_size)) {$wmfont_size=12;}
if (!isset($wmrgbtext)) {$wmrgbtext="FFFFFF";}
if (!isset($wmrgbtsdw)) {$wmrgbtsdw="000000";}
if (!isset($wmhotspot)) {$wmhotspot=8;}
if (!isset($wmtxp)) {$wmtxp=0;}
if (!isset($wmtyp)) {$wmtyp=0;}
if (!isset($wmsxp)) {$wmsxp=1;}
if (!isset($wmsyp)) {$wmsyp=1;}
watermark($wmimg,$wmtext,$wmdatfmt,$wmfont,$wmfont_size,$wmrgbtext,$wmrgbtsdw,$wmhotspot,$wmtxp,$wmtyp,$wmsxp,$wmsyp);
}
Sample HTML page:
<HTML>
<HEAD>
<TITLE>Watermark test</TITLE>
</HEAD>
<BODY>
This is a watermarked picture:
<P>
<IMG SRC="watermark.php?wmimg=image.jpg&wmtext=TEST">
<P>
END
</BODY>
</HTML>
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