GD library creating images

phphelp84

When I use this code:

<?php

// create image
$image = imagecreate(200,200);

// create color R=100, G=0, R=0
$maroon = ImageColorAllocate($image,100,0,0);

// create color R=255, G=255, R=255
$white = ImageColorAllocate($image,255,255,255);

// create white background
ImageFilledRectangle($image,0,0,200,200,$white);

// create frame
ImageRectangle($image,10,10,190,190,$maroon);

// create inner rectangle
ImageFilledRectangle($image,50,50,150,150,$maroon)
;

// render image
ImageJPEG($image);

// cleanup memory
ImageDestroy($image);
?>

It gives me this error every time:

Warning: Cannot add header information - headers already sent by (output started at /home/westwood/public_html/button.php3:2) in /home/westwood/public_html/button.php3 on line 3
‰PNG IHDR0ô¸××PLTE,¯ÿÿÿ0W!Hƒ +???¿¿¿‡Ã•¯×…‹•Š—«ÇÑàß=£ébIDATxœcPB È€qØò™@¾]‰ÆWºˆà+ &©#ñŸA ?ŸMý"u4û Ñøí¨öW ™Ç² Í>&üE¨üYJhöi òÕîaÃA_Ôâ+ ¢ÉFW„-%IEND®B`‚

Any help would be appreciated. Thanks

theeper

That code works fine for me, are you using it as an include or something where you already have some output?

barand

Shouldn't there be a

header("Content-Type: image/jpeg");

in there somewhere? Or is that optional?

Brian_A

Is there a way to use a similar script, perhaps to allow a person who has uploaded an image, to be able to view the image, and resize it, then save the resized image?

The problem I have found is that (and admittedly it is 'cause I don't know that much yet), that I must display the image FULL SCREEN or I also get the "garble" instead of the image. How do we diplay it withing our HTML and have the option to save it, make it a link, or what ever?

Thanks

barand

Hi Brian_A

Place the image in your HTML page with an <img> tag as you would any other image and specify height and width.

A viewer can right-click on it and save the image.

Brian_A

Thanks for the quick reply, later today when I have time I will try this. If this is all that it takes than TERRIFIC!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, I do appreciate your help and reply.

Take care.

Brian_A

Okay, I used the code above which by itself it certainly does work just fine but to embed into HTML, well I called the image as was suggested and the image does not display so I must be doing something wrong. I just don't understand how to created and/or resize images and them embed them into HTML/PHP pages so that a user can, for example, selct to save the image.

Hmmmmmmmmmmmmmmmmm.

Follow up question.

<?php

//thumbnail max size
//$size = 100;

//max additional size created by margin
$margin = 10;

//draw a border?
$border = false;

//draw a drop shadow?
//$shadow = true;

//where are the images?
$jpegdir = 'images';

//nothing else to configure

$jpeg = $jpegdir .'/'. $HTTP_GET_VARS['img'];

if($d=getimagesize($jpeg)){
$dim = ($d[1]>$d[0]) ? 1 : 0;
$mod = $size / $d[$dim];

$w = (int) ($d[0] * $mod);
$h = (int) ($d[1] * $mod);

$x = (int)(($size + $margin - $w) / 2);
$y = (int)(($size + $margin - $h) / 2);

//echo "<br>$w x $h";
//echo "<br>$x x $y";

header('Content-type: image/jpeg');

$src = imagecreatefromjpeg($jpeg);
$dst = imagecreate($size+($margin * 2), $size+($margin * 2));
$white = imagecolorallocate($dst,255,255,255);
imagefill($dst,0,0,$white);
if($border){
	$black = imagecolorallocate($dst,0,0,0);
	imagerectangle($dst,0,0,$size+$margin,$size+$margin,$black);
}
if($shadow){
	$lighter = imagecolorallocate($dst,220,220,220);
	imagefilledrectangle($dst,($x+3),($y+3),($w+$x+3),($h+$y+3),$lighter);
	$light = imagecolorallocate($dst,180,180,180);
	imagefilledrectangle($dst,($x+1),($y+1),($w+$x+1),($h+$y+1),$light);
	$dark = imagecolorallocate($dst,140,140,140);
	imagefilledrectangle($dst,($x),($y),($w+$x),($h+$y),$dark);
}
//imagecopyresampled($dst,$src,$x,$y,0,0,$w,$h,$d[0],$d[1]);
imagecopyresized($dst,$src,$x,$y,0,0,$w,$h,$d[0],$d[1]);

imagejpeg($dst);
imagedestroy($dst);
imagedestroy($src);

$fp=fopen("temp.jpg","wb");
fputs($fp,$dst,strlen($dst));
fclose($fp);

}

Why does this not properly save the image that is rendered? I pass the appropriate arg's in and the image does appear resized as needed on the screen. The saved file is not properly formatted though. What am I missing?
[/COLOR]

barand

Lets assume that code is called "image.php"

BTW you need the trailing "?>"

Lose the last 3 lines.

Embed it in your page with
<img src="image.php" width="??" height="??" >

To test the image is ok, try loading by entering
[url]http://..path../image.php?img=myjpegname[/url]
as the url in your browser address bar

IMHO its too much like hard work using php just to display an unmodified image, better to use it create dynamic images such as graphs, or buttons with a common background but dynamic text.