PHP 5.4.31 Released

imagecreate

(PHP 4, PHP 5)

imagecreateCreate a new palette based image

Opis

resource imagecreate ( int $width , int $height )

imagecreate() returns an image identifier representing a blank image of specified size.

We recommend the use of imagecreatetruecolor().

Parametry

width

The image width.

height

The image height.

Zwracane wartości

Zwraca identyfikator zasobu obrazu w przypadku powodzenia lub FALSE w przypadku błędów.

Przykłady

Przykład #1 Creating a new GD image stream and outputting an image.

<?php
header
("Content-Type: image/png");
$im = @imagecreate(11020)
    or die(
"Cannot Initialize new GD image stream");
$background_color imagecolorallocate($im000);
$text_color imagecolorallocate($im2331491);
imagestring($im155,  "A Simple Text String"$text_color);
imagepng($im);
imagedestroy($im);
?>

Powyższy przykład wyświetli coś podobnego do:

Output of example : Creating a new GD image stream and outputting an image.

Zobacz też:

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User Contributed Notes 19 notes

up
7
Sohel Taslim
7 years ago
It is easy and simple example to convert Text to Image with selected font.
It helps me to display Bangla text as image when users have no installed bangla font.

I hope it can help you too!

<?php
//Kip the font file together or write proper location.
makeImageF("Life in PHP.","CENTURY.TTF");

function
makeImageF($text, $font="CENTURY.TTF", $W=200, $H=20, $X=0, $Y=0, $fsize=18, $color=array(0x0,0x0,0x0), $bgcolor=array(0xFF,0xFF,0xFF)){
       
   
$im = @imagecreate($W, $H)
        or die(
"Cannot Initialize new GD image stream");
       
   
$background_color = imagecolorallocate($im, $bgcolor[0], $bgcolor[1], $bgcolor[2]);        //RGB color background.
   
$text_color = imagecolorallocate($im, $color[0], $color[1], $color[2]);            //RGB color text.
           
   
imagettftext($im, $fsize, $X, $Y, $fsize, $text_color, $font, $text);
   
   
header("Content-type: image/gif");               
    return
imagegif($im);
}

?>
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5
DHKold
9 years ago
to create an image from a BMP file, I made this function, that return a resource like the others ImageCreateFrom function:

<?php
/*********************************************/
/* Fonction: ImageCreateFromBMP              */
/* Author:   DHKold                          */
/* Contact:  admin@dhkold.com                */
/* Date:     The 15th of June 2005           */
/* Version:  2.0B                            */
/*********************************************/

function ImageCreateFromBMP($filename)
{
//Ouverture du fichier en mode binaire
  
if (! $f1 = fopen($filename,"rb")) return FALSE;

//1 : Chargement des enttes FICHIER
  
$FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14));
   if (
$FILE['file_type'] != 19778) return FALSE;

//2 : Chargement des enttes BMP
  
$BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
                
'/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
                
'/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1,40));
  
$BMP['colors'] = pow(2,$BMP['bits_per_pixel']);
   if (
$BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset'];
  
$BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8;
  
$BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']);
  
$BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4);
  
$BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4);
  
$BMP['decal'] = 4-(4*$BMP['decal']);
   if (
$BMP['decal'] == 4) $BMP['decal'] = 0;

//3 : Chargement des couleurs de la palette
  
$PALETTE = array();
   if (
$BMP['colors'] < 16777216)
   {
   
$PALETTE = unpack('V'.$BMP['colors'], fread($f1,$BMP['colors']*4));
   }

//4 : Cration de l'image
  
$IMG = fread($f1,$BMP['size_bitmap']);
  
$VIDE = chr(0);

  
$res = imagecreatetruecolor($BMP['width'],$BMP['height']);
  
$P = 0;
  
$Y = $BMP['height']-1;
   while (
$Y >= 0)
   {
   
$X=0;
    while (
$X < $BMP['width'])
    {
     if (
$BMP['bits_per_pixel'] == 24)
       
$COLOR = unpack("V",substr($IMG,$P,3).$VIDE);
     elseif (
$BMP['bits_per_pixel'] == 16)
     { 
       
$COLOR = unpack("n",substr($IMG,$P,2));
       
$COLOR[1] = $PALETTE[$COLOR[1]+1];
     }
     elseif (
$BMP['bits_per_pixel'] == 8)
     { 
       
$COLOR = unpack("n",$VIDE.substr($IMG,$P,1));
       
$COLOR[1] = $PALETTE[$COLOR[1]+1];
     }
     elseif (
$BMP['bits_per_pixel'] == 4)
     {
       
$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
        if ((
$P*2)%2 == 0) $COLOR[1] = ($COLOR[1] >> 4) ; else $COLOR[1] = ($COLOR[1] & 0x0F);
       
$COLOR[1] = $PALETTE[$COLOR[1]+1];
     }
     elseif (
$BMP['bits_per_pixel'] == 1)
     {
       
$COLOR = unpack("n",$VIDE.substr($IMG,floor($P),1));
        if     ((
$P*8)%8 == 0) $COLOR[1] =  $COLOR[1]        >>7;
        elseif ((
$P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0x40)>>6;
        elseif ((
$P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0x20)>>5;
        elseif ((
$P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0x10)>>4;
        elseif ((
$P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0x8)>>3;
        elseif ((
$P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0x4)>>2;
        elseif ((
$P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0x2)>>1;
        elseif ((
$P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0x1);
       
$COLOR[1] = $PALETTE[$COLOR[1]+1];
     }
     else
        return
FALSE;
    
imagesetpixel($res,$X,$Y,$COLOR[1]);
    
$X++;
    
$P += $BMP['bytes_per_pixel'];
    }
   
$Y--;
   
$P+=$BMP['decal'];
   }

//Fermeture du fichier
  
fclose($f1);

return
$res;
}
?>
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0
JamesM
4 years ago
doesnt ruin the image but adds display to the output.
this will generate an image with a random color. if you like it you can use it because you have the RBG result too.
<?php
header
("content-type:image/png");
$im = imagecreate(100, 100);
$a = sprintf('%04x',mt_rand(0, 65535));
$b = sprintf('%04x',mt_rand(0, 65535));
$c = sprintf('%04x',mt_rand(0, 65535));
$white = imagecolorallocate($im,$a,$b,$c);
imagepng($im);
imagedestroy($im);
echo
"\n\n\n$a-$b-$c";
?>
up
0
help at nanomc dot com
8 years ago
// A simple XY graph

<html>
<head>
       
<title>XY Graph</title>

<h2>Practice XY Graph</h2>
</head>
<body>

<?php
$left
= 0;
$top = 0;
$x_size = 400;
$y_size = 400;

$char_width = 8;
$char_height = 11;

$x_start = $x_left + 100;
$y_start = $top + $char_height * 1.5;
$x_end = $x_start + $x_size;
$y_end = $y_start + $y_size;
$right = $x_start + $x_size + 40;
$bottom = $y_start + $y_size + $char_height * 1.5;

$graph_n = 100;
for(
$i = 0; $i < $graph_n; $i++ )
    {
   
$graph_x[$i] = $i;
   
$graph_y[$i] = $i * $i;
    }

   
$min_x = 9e99;
   
$min_y = 9e99;
   
$max_x = -9e99;
   
$max_y = -9e99;

   
$avg_y = 0.0;
   
    for(
$i = 0; $i < $graph_n; $i++ )
        {
        if(
$graph_x[$i] < $min_x )
           
$min_x = $graph_x[$i];

        if(
$graph_x[$i] > $max_x )
           
$max_x = $graph_x[$i];

        if(
$graph_y[$i] < $min_y )
           
$min_y = $graph_y[$i];

        if(
$graph_y[$i] > $max_y )
           
$max_y = $graph_y[$i];

       
$avg_y += $graph_y[$i];
        }
   
   
$avg_y = $avg_y / $graph_n;

   
$min_x = 0;
   
$min_y = 0;
   
$max_x += $max_x * 0.05;
   
$max_y += $max_y * 0.05;

$image = ImageCreate($right - $left, $bottom - $top);
$background_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 233, 14, 91);

$grey = ImageColorAllocate($image, 204, 204, 204);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
$red = imagecolorallocate($image, 255, 0, 0);

imagerectangle($image, $left, $top, $right - 1, $bottom - 1, $black );
imagerectangle($image, $x_start, $y_start, $x_end, $y_end, $grey );

for(
$i = 0; $i < $graph_n; $i++ )
   {
  
$pt_x = $x_start + ($x_end-$x_start)*($graph_x[$i]-$min_x)/($max_x-$min_x);
  
$pt_y = $y_end - ($y_end - $y_start)*($graph_y[$i]-$min_y)/($max_y-$min_y);

//  imagesetpixel( $image, $pt_x, $pt_y, $black );
  
imagechar($image, 2, $pt_x - 3, $pt_y - 10, '.', $black);
   }

$string = sprintf("%2.5f", $max_y);
imagestring($image, 4, $x_start - strlen($string) * $char_width, $y_start - $char_width, $string, $black);

$string = sprintf("%2.5f", $min_y);
imagestring($image, 4, $x_start - strlen($string) * $char_width, $y_end - $char_height, $string, $black);

$string = sprintf("%2.5f", $min_x);
imagestring($image, 4, $x_start - (strlen($string) * $char_width)/2, $y_end, $string, $black);
   
$string = sprintf("%2.5f", $max_x);
imagestring($image, 4, $x_end - (strlen($string) * $char_width) / 2, $y_end, $string, $black);

$x_title = 'x axis';
$y_title = 'y axis';

imagestring($image, 4, $x_start + ($x_end - $x_start) / 2 - strlen($x_title) * $char_width / 2, $y_end, $x_title, $black);

imagestring($image, 4, $char_width, ($y_end - $y_start) / 2, $y_title, $black);

header('Content-type: image/png');
$filename = sprintf("%d.png", time());
ImagePNG($image,$filename);
ImageDestroy($image);

printf("<img src='%s'> ", $filename);
?>

</body>
</html>
up
0
foxlovr1 at cox dot net
10 years ago
You can set it up so you can write a text which is controled from the URL.

Like this...

<?php
header
("Content-type: image/png");
$im = @imagecreate(128, 16) or die("Cannot Initialize new GD image stream");
$bc = imagecolorallocate($im, 0, 255, 255);
$tc = imagecolorallocate($im, 0, 0, 0);
imagestring($im, 1, 4, 4$t, $tc);
imagepng($im);
imagedestroy($im);
?>

Then when you use the image, use this...

<img src="http://www.yourdomain.com/stuff/cool_image.php?t=Text">

This will create an image with a cyan background, and in black text it will say "Text"

EMail me at foxlovr1@cox.net or aquafox90@yahoo.com for comments/questions.
up
0
sjnorrie at hotmail dot com
10 years ago
On windows.

When you get undefined function image* it means the gd library isnt being used. Check the php.ini file. Make sure the php_gd.dll isnt commented out. Restarting apache should result in the image functions working.
up
0
tore at kyberheimen dot com
11 years ago
GD UPGRADE PROBLEM:
I used imagecreate with gd 1.6 to make resized images of big photos. Then, when using the same script on gd 2.0, the colors got all wrong.
Using imagecreatetruecolor() fixed the problem!
up
0
php at silisoftware dot com
12 years ago
Don't try and create an image with a really large width and/or height. First, $width x $height is (at least) the bytes of memory that need to be allocated. Secondly, if you exceed the range of int for either parameter, Apache crashes (before allocating any memory).
Don't ask how I figured this out ;)
up
0
robert at scpallas dot de
12 years ago
The function ImageCreate() creates a PALETTE image.
The function ImageCreateFromJPEG() creates a TRUE COLOR image.

When you use GD 2.0 you will get an error when you try to use ImageCopy()
with one True color image and one Palette image.

Be sure to convert one of the images before using ImageCopy() or use ImageCreateTrueColor() instead of ImageCreate().
up
0
andrus at vnet dot ee
13 years ago
Dont forget to use ImageDestoy after showed image. I forgot it, my webpage had about 15 pictures what was generated by GD and webserver died very fastly (server was Dual Xeon 900MHz and 4G RAM :[[ ). It died cos of not enough memory :\
up
0
wouter at rusman dot net
13 years ago
to compile GD support on some linux distributions you have to include these with the ./configure command :
--with=gd=/usr --with-jpeg=/usr --with-png=/usr --with-zlib=/usr

(i had to include this on Redhat 6.1)
this becase the libraries are in /usr/lib instead of /lib
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0
altype at bellsouth dot net
13 years ago
ImagePNG($pic,"./dir/pic.png");

To save image as a file, I had to create a directory "dir" and CHMOD 777 to give read, write, and execute permission for everyone - or it wouldn't save it...
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0
removethisbeforebayet at removethistooenseirb dot fr
13 years ago
Pay attention to a problem I encountered.
Png images created with the PHP function seems to be very badly recognised by old browsers, especially -well, mainly - by IE 4.0 (crash of the browser).
I think this is probably due to the fact that, when IE 4.0 was released, the png format was either very recent, either not very used, because of the widespread jpeg and gif formats...
So, if you plan to dynamically create images for a web site to be seen by IE 4.0 users, think of it...
May'be the jpeg format will do the job better.
up
-1
cstevens at gencom dot us
10 years ago
Here's how I resolved the "Fatal error: Call to undefined function: imagecreate()" error using Gentoo:

1) add a USE flag for gdb in /etc/make.conf
 
   USE="3dnow avi [whatever else you have] gdb"

   Note: here's a list of all of the USE flags:
   http://www.gentoo.org/dyn/use-index.xml

2) unmerged mod_php

*Note* It could take awhile to "remerge" as it may need to compile several dependancies...do this during not production hours and have a backup if you absolutely cannot have downtime

   emerge -C mod_php

3) emerged mod_php

   emerge -p mod_php
    # find out if it's going to take awhile

4) edit /etc/php/apach2-php4/php.ini
     uncomment the "extension=php_gd2.dll" line

5) Restart apache2

    /etc/init.d/apache2 restart

Hope this helps!

--
Cooper Stevenson
GenCom
http://www.gencom.us
up
-1
tassader at xmail dot cz
10 years ago
It seems that imagecreate creates a grayscale image with gd2
up
-1
sk89q
6 years ago
Loads a file based on its filetype and returns false if it fails.

<?php
function imagecreatefromfile($path, $user_functions = false)
{
   
$info = @getimagesize($path);
   
    if(!
$info)
    {
        return
false;
    }
   
   
$functions = array(
       
IMAGETYPE_GIF => 'imagecreatefromgif',
       
IMAGETYPE_JPEG => 'imagecreatefromjpeg',
       
IMAGETYPE_PNG => 'imagecreatefrompng',
       
IMAGETYPE_WBMP => 'imagecreatefromwbmp',
       
IMAGETYPE_XBM => 'imagecreatefromwxbm',
        );
   
    if(
$user_functions)
    {
       
$functions[IMAGETYPE_BMP] = 'imagecreatefrombmp';
    }
   
    if(!
$functions[$info[2]])
    {
        return
false;
    }
   
    if(!
function_exists($functions[$info[2]]))
    {
        return
false;
    }
   
    return
$functions[$info[2]]($path);
}
?>
up
-1
kim at kimmccall dot org
13 years ago
How I fixed my "undefined function imagecreate()" problem:
I was having the same problem many have reported where most of PHP worked but the gd functions didn't.  I'd installed the RedHat rpm php-4.0.1pl2.  It said (phpinfo.php) that it had been configured with the '--with-gd=shared' option.  In my /usr/lib directory, I had both libgd.so.1.8.3 and libgd.a.  I decided to compile with the static library instead, so I downloaded the sources and built with all the same configuration flags except that I used --with-gd=/usr.  Now my gd library works!!!
up
-3
scottlindh pwnd at hushmail dot com
6 years ago
to install on UBUNTU do the following..

sudo apt-get install php5-gd

After installing the package I restarted the apache

sudo /etc/init.d/apache reload

goto love ubuntu...
up
-3
Anonymous
9 years ago
This is how you can create a thumbnail with maximum height and width. This way it will fit nicely in a gallery table. In this example $im is the source image
<?
    //calculate thumb size
            $ow = imagesx($im);
            $oh = imagesy($im);
            $maxh = 100;
            $maxw = 150;
            $new_h = $oh;
            $new_w = $ow;

            if($oh > $maxh || $ow > $maxw){
               $new_h = ($oh > $ow) ? $maxh : $oh*($maxw/$ow);
               $new_w = $new_h/$oh*$ow;
            }

            //create dst image
            $dst_img = ImageCreateTrueColor($new_w,$new_h);
            //resize and copy image
            ImageCopyResized($dst_img, $im, 0,0,0,0, $new_w, $new_h, ImageSX($im), ImageSY($im));   
            $function_image_new($dst_img,$galdir.$file);
?>
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