imagecreate

(PHP 4, PHP 5, PHP 7, PHP 8)

imagecreate — Erzeugt ein neues Palettenbild

Beschreibung

imagecreate(int $width, int $height): GdImage|false

imagecreate() gibt den Bezeichner für ein Bild zurück, der ein leeres Bild mit der angegebenen Größe repräsentiert.

Im Allgemeinen wird empfohlen, die Funktion imagecreatetruecolor() anstelle von imagecreate() zu verwenden, sodass die Bildverarbeitung mit der bestmöglichen Qualität erfolgt. Sollen Palettenbilder ausgegeben werden, dann sollte imagetruecolortopalette() unmittelbar vor dem Speichern des Bildes mit imagepng() oder imagegif() aufgerufen werden.

Parameter-Liste

width: Die Breite des Bildes.
height: Die Höhe des Bildes.

Rückgabewerte

Gibt im Erfolgsfall eine Bildobjekt zurück, im Fehlerfall false.

Changelog

Version	Beschreibung
8.0.0	Bei Erfolg gibt diese Funktion jetzt eine GDImage-Instanz zurück; zuvor wurde eine Ressource zurückgegeben.

Beispiele

Beispiel #1 Erzeugen eines neuen GD-Bild-Streams und Ausgabe des Bildes

<?php
header("Content-Type: image/png");
$im = @imagecreate(110, 20)
    or die("Kann keinen neuen GD-Bild-Stream erzeugen");
$background_color = imagecolorallocate($im, 0, 0, 0);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5, "Ein Test-String", $text_color);
imagepng($im);
imagedestroy($im);
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Siehe auch

imagedestroy() - Löscht ein Bild
imagecreatetruecolor() - Create a new true color image

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User Contributed Notes 17 notes

down

DHKold ¶

19 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 ent?tes FICHIER
   $FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1,14));
   if ($FILE['file_type'] != 19778) return FALSE;

 //2 : Chargement des ent?tes 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 : Cr?ation 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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wouter at rusman dot net ¶

23 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

down

Sohel Taslim ¶

17 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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robert at scpallas dot de ¶

22 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().

down

-1

altype at bellsouth dot net ¶

23 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...

down

-2

JamesM ¶

14 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";
?>

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-1

php at silisoftware dot com ¶

22 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 ;)

down

-4

scottlindh pwnd at hushmail dot com ¶

17 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...

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-2

tassader at xmail dot cz ¶

21 years ago

It seems that imagecreate creates a grayscale image with gd2

down

-2

tore at kyberheimen dot com ¶

22 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!

down

-4

kim at kimmccall dot org ¶

24 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!!!

down

-3

cstevens at gencom dot us ¶

20 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

down

-4

marc at gutt dot it ¶

9 years ago

Based on DHKold's contribution I realized imagecreatefrombmp() to support all 1-, 4-, 8-, 16-, 24- und 32-Bit Bitmaps. Finally Fabien Ménager brought it to perfection for the project DOMPDF. Feel free to use it:
https://code.google.com/p/dompdf/source/browse/trunk/dompdf/include/functions.inc.php?spec=svn504&r=504#551

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-4

foxlovr1 at cox dot net ¶

20 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.

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-5

removethisbeforebayet at removethistooenseirb dot fr ¶

23 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.

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-3

andrus at vnet dot ee ¶

23 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 :\

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-4

sjnorrie at hotmail dot com ¶

21 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.

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