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XLI. Funzioni per le immaginiIntroduzione
In PHP puoi usare delle funzioni specifiche per sapere la dimensione di un'immagine
JPEG, GIF,
PNG, SWF,
TIFF e JPEG2000.
Requisiti
Se hai installato le librerie GD (scaricabili su http://www.boutell.com/gd/) sarai anche in grado di creare immagini al volo
e di modificarle.
I formati delle immagini sulle quali potrai agire dipendono dalla versione
delle librerie GD che hai installato, e dalle altre librerie di cui
GD può aver bisogno per accedere a quei formati di immagine.
Versioni precedenti alla gd-1.6 supportano il formato GIF ma non quello PNG,
mentre versioni superiori alla
gd-1.6 supportano il formato PNG ma non il GIF.
Se hai compilato PHP con l'opzione --enable-exif
sarai in grado di lavorare con le informazioni memorizzate negli
header delle immagini JPEG e TIFF. Queste
funzioni non richiedono le librerie GD.
Installazione
Per leggere e scrivere immagini in formato JPEG avrai bisogno di
installare jpeg-6b (scaricabile da ftp://ftp.uu.net/graphics/jpeg/) e
quindi ricompilare le librerie GD
in modo che usino jpeg-6b. Dovrai anche
compilare PHP con l'opzione
--with-jpeg-dir=/percorso/per/jpeg-6b.
Per aggiungere il supporto per i Font Type 1 dovrai installare t1lib (scaricabile
su ftp://sunsite.unc.edu/pub/Linux/libs/graphics/), e quindi aggiungere l'opzione
--with-t1lib[=dir].
Configurazione di RuntimeQuesta estensione non definisce
alcuna direttiva di configurazione in php.ini Tipi di risorseQuesta estensione non definisce alcun tipo di risorsa. Costanti predefinite
Queste costanti sono definite da questa estensione e
sono disponibili solo se l'estensione è stata compilata
nel PHP o se è stata caricata dinamicamente a runtime.
 add a note
User Contributed Notes
Funzioni per le immagini
purplebz at hotmail dot com
12-Apr-2004 04:47
Installing GD extension on Windows:
First you need to download PHP 4.3.x zip package not the PHP 4.3.x installer! PHP 4.3.x zip package has extensions included already.
Follow the instructions on installing PHP at install.text.
If PHP is already working, you may now activate the GD by doing the following:
1. Uncomment the - extension_dir="". Then you should point it to where the extensions folder is located. Extensions folder is extracted from PHP zip file you downloaded.
Example: extension_dir = C:/PHP/extensions
2. Uncomment the following by removing the semicolon -
Example: extension=php_gd2.dll
3. Test if GD extension is already loaded by executing the following lines:
<?php
var_dump(gd_info());
?>
Hope this helps!
info [@] solanki [d o t] ch
14-Feb-2004 03:43
A quite important function missing in the gdlib ist the color gradient.
After trying a bit I got one that works quite good.
So if anybody needs it:
<?php
function imagecolorgradient($img,$x1,$y1,$x2,$y2,$f_c,$s_c){
if($y2>$y1) $y=$y2-$y1;
else $y=$y1-$y2;
if($f_c[0]>$s_c[0]) $r_range=$f_c[0]-$s_c[0];
else $r_range=$s_c[0]-$f_c[0];
if($f_c[1]>$s_c[1]) $g_range=$f_c[1]-$s_c[1];
else $g_range=$s_c[1]-$f_c[1];
if($f_c[2]>$s_c[2]) $b_range=$f_c[2]-$s_c[2];
else $b_range=$s_c[2]-$f_c[2];
$r_px=$r_range/$y;
$g_px=$g_range/$y;
$b_px=$b_range/$y;
$r=$f_c[0];
$g=$f_c[1];
$b=$f_c[2];
for($i=0;$i<=$y;$i++){
$col=imagecolorallocate($img,round($r),round($g),round($b));
imageline($img,$x1,$y1+$i,$x2,$y1+$i,$col);
if($f_c[0]<$s_c[0]) $r+=$r_px;
else $r-=$r_px;
if($f_c[1]<$s_c[1]) $g+=$g_px;
else $g-=$g_px;
if($f_c[2]<$s_c[2]) $b+=$b_px;
else $b-=$b_px;
}
return $img;
}
?>
$img ist the image handle, $x1 and $y1 are the start points, $x2 and $y2 the ending points.
$f_c and $s_c are the first and second color ARRAYs.
jeff at lushmedia dot com
04-Nov-2003 02:52
I wrote an online overview of the image functions that people might find useful. In addition to a general overview of the various function categories and code samples, I have included many interactive examples of the functions, allowing viewers to experiment with the parameters, and seeing the results in real time. The presentation is located at New York PHP
http://www.nyphp.org/content/presentations/GDintro/
daniel @ swn
17-Sep-2003 01:55
For everyone trying to get jpeg support working:
Since I could not compile jpeg support with the bundled gd library in php 4.3.3, I tried with the external one and got some reference errors. If you get these errors when make'ing PHP, try to set the XPM directory when configuring gd2. I noticed that there are some error messages when compiling php with the default xpm setting in gd2's configure. Maybe there is something similar concerning freetype support, too...so I activated it however I need it or not.
What I did:
I downloaded and installed jpeg6b, freetype etc.:
./configure
make
make install
downloaded xpm and copied any files and directories to /usr/local
downloaded gd2 and installed it..
./configure --with-jpeg=/usr/local --with-freetype=/usr/local --with-png=/usr/local --with-xpm=/usr/local
[make clean]
make
make install
and when configuring gd2 told me that it could not compile xpm support. Maybe I did something wrong but now the php 'make' runs without errors:
./configure [...] --with-gd=/usr/local --with-jpeg-dir=/usr/local
make
make install
and the jpeg functions started to work...
da_linuxguru at NOSPAM dot hotmail dot com
11-Sep-2003 10:35
Installing Php with GD support
Packages Needed:
GD
zlib
libjpeg-6b
Php
Installing GD
a) ./configure
b) gmake, gmake install
Installing Zlib
a) ./configure --shared
b) gmake, gmake install
Installing Libjpeg-6b
a) ./configure --enable-shared
b) gmake, gmake install
Assuming your apache installation is in the directory /www
Installing Php
./configure --with-apxs2=/www/bin/apxs --with-mysql --prefix=/www/php --with-config-file-path=/www/php --enable-track-vars --disable-cgi --with-gd=/usr/local --with-jpeg-dir=/usr/local
Finally, I had problems while compiling php ver 4.3.2 and 4.3.3 bot with the same problem related to a function in the file phpsourcedir/ext/gd/gd.c called Imagecache seomthing... I had to comment this line and then all went fine, however the tumbnails that I am still gettting are 256 colors only.
-Dhaval
pigmeu at pigmeu dot net
02-Sep-2003 06:09
I had some troubles when trying to resize an image gotten from a database blob field... Perhaps that these image functions don't work with opened image streams...
So, I had to make this workaround...
Use this code if you are trying to handle imagens from a database.
//...
// creating a temp image name
$t_img_name = tempnam ("/tmp", "timg");
$t_img = fopen($t_img_name, "w");
// $content is the blob field with the image.
fwrite($t_img, $content);
fclose($t_img);
// now, do what want to with the image
$size = getimagesize($t_img_name);
echo $size[0]." - ".$size[1];
// don't forget to delete the temp file after all.
unlink($t_img_name);
//...
sameerni at netscape dot net
19-Aug-2003 06:30
i tried to install gd on linux (RedHat 8.0) with apache 1.3.27 and php 4.3.2
i had libjpeg, libz, libgif, libpng, libgd installed in /usr/lib.
i compiled php using following ./configure command:
./configure --prefix=/usr/local/php --with-apxs=/usr/local/apache/bin/apxs --with-mysql=/usr/local/mysql --with-gd --with-gd-dir=/usr/lib --with-freetype --with-freetype-dir=/usr/lib --enable-ftp --with-jpeg --with-jpeg-dir=/usr/lib --with-png --with-png-dir=/usr/lib --with-gif --with-gif-dir=/usr/lib --with-xml --with-xslt --with-zlib --with-zlib-dir=/usr/lib
it compiled without any problem. but phpinfo() did not show jpeg support.
and it did not find imagecreatefromjpeg() so i installed libjpeg-6b in different directory (in /usr/lib/jpeg6b) and recompiled php with following command.
./configure --prefix=/usr/local/php --with-apxs=/usr/local/apache/bin/apxs --with-mysql=/usr/local/mysql --with-gd --with-gd-dir=/usr/lib --with-freetype --with-freetype-dir=/usr/lib --enable-ftp --with-jpeg --with-jpeg-dir=/usr/lib/jpeg6b --with-png --with-png-dir=/usr/lib --with-gif --with-gif-dir=/usr/lib --with-xml --with-xslt --with-zlib --with-zlib-dir=/usr/lib
and imagecreatefromjpeg() started working.
also phpinfo() shows jpg support enabled.
----------output of phpinfo()-------------
[snip]
gd
GD Support enabled
GD Version bundled (2.0.12 compatible)
FreeType Support enabled
FreeType Linkage with freetype
GIF Read Support enabled
JPG Support enabled
PNG Support enabled
WBMP Support enabled
XBM Support enabled
[snip]
----------output of phpinfo()-------------
hope you will find this useful.
office at 4point-webdesign dot com
06-Jul-2003 08:29
Here's a funtion i used to resize and save images uploaded by the user, you can either create thumbnails or other images.
Main "feature" is that the width and height stay relativ to each other.
imgcomp is the quality, i turned it around so now its from 0 -best to 100 -most compressed.
For gif version just change the functions names.
function resampimagejpg($forcedwidth, $forcedheight, $sourcefile, $destfile, $imgcomp)
{
$g_imgcomp=100-$imgcomp;
$g_srcfile=$sourcefile;
$g_dstfile=$destfile;
$g_fw=$forcedwidth;
$g_fh=$forcedheight;
if(file_exists($g_srcfile))
{
$g_is=getimagesize($g_srcfile);
if(($g_is[0]-$g_fw)>=($g_is[1]-$g_fh))
{
$g_iw=$g_fw;
$g_ih=($g_fw/$g_is[0])*$g_is[1];
}
else
{
$g_ih=$g_fh;
$g_iw=($g_ih/$g_is[1])*$g_is[0];
}
$img_src=imagecreatefromjpeg($g_srcfile);
$img_dst=imagecreate($g_iw,$g_ih);
imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $g_iw, $g_ih, $g_is[0], $g_is[1]);
imagejpeg($img_dst, $g_dstfile, $g_imgcomp);
imagedestroy($img_dst);
return true;
}
else
return false;
}
dehumanizer at optusnet dot com dot au
31-May-2003 12:18
If you are trying to install jpeg support with php, then first install jpeg-6b and libpng. And when starting to install gd, check out the Makefile. I tried to install gd-1.8.4 and found that the Makefile didnt include the jpeglibs, rather all were commented. Uncomment the lines where you'll find the JPEG libs are mentioned. Like the lines below:
CFLAGS=-0 -DHAVE_LIBPNG -DHAVE_LIBJPEG
CFLAGS=-0 -DHAVE_LIBXPM -DHAVE_LIBPNG -DHAVE_LIBJPEG
There are several lines like that those you have to uncomment. Now install gd.
Before installing php, check if there is any config.cache file existing. If it does, delete it. The php ./configure sysntax should have --with-jpeg-dir --with-png-dir --with-gd=/path/to/gd
After configure is done, check out the config.cache file. If jpeg and png supports are installed successfully, you should be able to find these lines:
ac_cv_lib_gd_gdImageCreateFromJpeg=
${ac_cv_lib_gd_gdImageCreateFromJpeg=yes}
ac_cv_lib_gd_gdImageCreateFromPng=
${ac_cv_lib_gd_gdImageCreateFromPng=yes}
now, make and make install.
I put all the installers in one directory. So, this is how my dir-structure looked like
/opt/apache/download/upgrade/apache_1.3.27
/opt/apache/download/upgrade/gd-1.8.4
/opt/apache/download/upgrade/jpeg-6b
/opt/apache/download/upgrade/libpng-1.2.5
/opt/apache/download/upgrade/php-4.2.3
No directory prefix was used while configuring gd/jpeg/libpng/
This worked for me pretty fine. Hope this will help and save time for someone.
sellout at NoSpAm dot dharmadevil dot com
16-Apr-2003 04:06
A fun little function to output UPC-A 11-digit barcodes.
Thanks to barcodeisland.com for the specs.
<?php
function UPCAbarcode($code) {
$lw = 2; $hi = 100;
$Lencode = array('0001101','0011001','0010011','0111101','0100011',
'0110001','0101111','0111011','0110111','0001011');
$Rencode = array('1110010','1100110','1101100','1000010','1011100',
'1001110','1010000','1000100','1001000','1110100');
$ends = '101'; $center = '01010';
if ( strlen($code) != 11 ) { die("UPC-A Must be 11 digits."); }
$ncode = '0'.$code;
$even = 0; $odd = 0;
for ($x=0;$x<12;$x++) {
if ($x % 2) { $odd += $ncode[$x]; } else { $even += $ncode[$x]; }
}
$code.=(10 - (($odd * 3 + $even) % 10)) % 10;
$bars=$ends;
$bars.=$Lencode[$code[0]];
for($x=1;$x<6;$x++) {
$bars.=$Lencode[$code[$x]];
}
$bars.=$center;
for($x=6;$x<12;$x++) {
$bars.=$Rencode[$code[$x]];
}
$bars.=$ends;
$img = ImageCreate($lw*95+30,$hi+30);
$fg = ImageColorAllocate($img, 0, 0, 0);
$bg = ImageColorAllocate($img, 255, 255, 255);
ImageFilledRectangle($img, 0, 0, $lw*95+30, $hi+30, $bg);
$shift=10;
for ($x=0;$x<strlen($bars);$x++) {
if (($x<10) || ($x>=45 && $x<50) || ($x >=85)) { $sh=10; } else { $sh=0; }
if ($bars[$x] == '1') { $color = $fg; } else { $color = $bg; }
ImageFilledRectangle($img, ($x*$lw)+15,5,($x+1)*$lw+14,$hi+5+$sh,$color);
}
ImageString($img,4,5,$hi-5,$code[0],$fg);
for ($x=0;$x<5;$x++) {
ImageString($img,5,$lw*(13+$x*6)+15,$hi+5,$code[$x+1],$fg);
ImageString($img,5,$lw*(53+$x*6)+15,$hi+5,$code[$x+6],$fg);
}
ImageString($img,4,$lw*95+17,$hi-5,$code[11],$fg);
header("Content-Type: image/png");
ImagePNG($img);
}
UPCAbarcode('12345678901');
?>
Angus Chung a swinburnemultimediastudent
03-Apr-2003 05:40
this code work faster in my p4 2G machine PHP Version 4.3.1 imageresampled() gives better quality however much slower when work on high resolution image , e.g. the DC photo.therefore i first use imageresized() to produce a middle size temp image, then imageresampled() the temp image to a smaller thumbnail and output to the browser
<?php
$t_w = 444; $t_h = 333; ................
................
imagecopyresized ($destimage,$srcimage,0,0,0,0,$t_w,$t_h,$width,$height);
$t_w2 = round($t_w/3); $t_h2 = round($t_h/3); $destimage2 = imagecreatetruecolor($t_w2,$t_h2); imagecopyresampled ($destimage2,$destimage,0,0,0,0,$t_w2,$t_h2,$t_w,$t_h);
imagedestroy($destimage);
imageinterlace ($destimage2,1);imagejpeg($destimage2, '', 45);
imagedestroy($destimage2);
.................
?>
RJ-Gerry at wiu dot edu
07-Mar-2003 06:00
I have successfully installed GD and FreeType 2 with PHP 4.3.0 on my OS X 10.2.4 (Jaguar) machine. Using fink http://fink.sourceforge.net which comes with dselect (a menu – based apt-get), I was able to download and install both GD and FreeType 2 without having to compile either one of them. I was then able to add them into PHP by using this configure command (and then make and make install of course):
./configure --with-mysql --with-apxs --with-gd=/sw --with-freetype-dir=/sw --with-ttf
The directories for gd and freetype were both /sw because that is where fink installs its software. I also added the –-with-ttf to make sure that True Type Fonts were supported. Hope this helps any OS X users!
khyri at idyllmtn dot com
06-Mar-2003 05:00
To save others the hours I spent, I'd like to point out the
following:
Even if you are using the built-in GD libraries for 4.3.0 and
above, you still need to download and install jpeg-6b, libpng
and zlib before you can manipulate anything except read-only
gifs. These libraries are NOT bundled.
And they need to be installed as shared, not static libraries.
The default installation for jpeg-6b will only make a static
library (do ./configure --enabled-shared) and the selection
of makefile for libpng will determine whether you end up with
a shared or static library.
cysoft at php dot net
05-Mar-2003 02:32
How to using GD out put chinese Characters (BIG 5 or GB2312).
the following code shows you how to using gd display chinese Characters.
there is a funcation called by ImageTTFText.
since gd dose not support GB2312/big5 but unicode.if you can convert
Characters to unicode which you want display then every thing will be done!
your 's yan
<?php
function gb23122uni($text) {
$rtext="";
$max=strlen($text);
for($i=0;$i<$max;$i++){
$h=ord($text[$i]);
if($h>=160 && $i<$max-1){
$rtext.="&#".base_convert(bin2hex(iconv("gb2312","ucs-2",
substr($text,$i,2))),16,10).";";
$i++;
}else{
$rtext.=$text[$i];
}
}
return $rtext;
}
Header("Content-type: image/gif");
$im = imagecreate(400,50);
$black = ImageColorAllocate($im, 0,255,0);
$white = ImageColorAllocate($im, 255,0,255);
ImageTTFText($im, 20, 0, 30, 30, $white, "c:\php\STCAIYUN.ttf",gb23122uni("
ÄãºÃ")."test");
Imagejpeg($im);
ImageDestroy($im);
?>
bermi.ferrer ) a.t ( akelos d·o·t com
26-Feb-2003 08:02
From PHP 4.3.X if the image color changes or its loosy use ImageCreateTrueColor() instead of ImageCreate()
sir_hmba at NOSPAMyahoo dot com
17-Jan-2003 04:13
The GD library, prior to 2.x, does not appear to process images with more than 256 colors without first converting them to a 256 color indexed (palette) image.
In other words, if you have a truecolor JPEG or PNG and you load the image up with these functions (e.g., imagecreatefrompng()) then the internal resource will be a palettized version of your original. The only information I found about this were in a few separate comments spread around this section.
If you compile PHP with a 2.0 or higher version of the GD library, then the internal image resource will not be subjected to this automatic conversion. I believe that all the RedHat PHP RPMs (as of today) still come compiled with the older version of GD (pre 2.0).
dbonomo at 3drealm dot net
27-Dec-2002 11:01
This may be a known thing among the more experienced programmers here, but a basic piece of information needed to allow you to include a php-generated image in a page with other content is that you treat it as if it were an image. Here is an example of what I mean:
<img src=filename.php?var1=val1&var2=val2>
In the above example filename.php is the php file that has all the image generation code.
The php you write to create the picture is essentially a picture itself, and needs to be treated as such. Maybe Im being thick, but it took a couple of days of hammering away at it to be able to mix php-generated images with the rest of the page's content.
I am so far very impressed with how straightforward this all is. I have been avoiding this aspect of the code but now I love it.
Hope this helps.
Doug Bonomo
webmaster at wutallan dot net
13-Dec-2002 05:47
Installing PHP with GD2 support on a system running Debian Woody is quite easy. You just need to install the deb packages of the libs, including the -dev packages. Do this with one apt-get command:
apt-get install libgd2 libgd2-dev libjpeg62 libjpeg62-dev libpng2 libpng2-dev libfreetype6 libfreetype6-dev
(libpng depends on zlib, so it will automatically be installed)
Having those libs installed, add this to your PHP configure command:
--with-gd --with-jpeg-dir=/usr/lib --with-png-dir=/usr/lib --with-freetype-dir=/usr/lib --with-zlib-dir=/usr/lib
oerisen at netscape dot net
13-Dec-2002 09:18
if you have PHP 4.2.3 windows binaries then just uncomment the line
;extension=php_gd.dll
then restart your web server
GD, and Freetype is enabled
but be careful when u use
imagettftext
you must point the correct path to the TTf font file !!!
but you must be twice careful some windows TTF (times, tahoma,...)fonts are not rendered and gives an error like
"The image ... cannot be displayed, because it contains errors"
I tested arial and verdena works fine :)
imagettftext ($im, $size, $angle, $left,$bottomleft , $col, $font, $text);
for windows it's best practice to place font files ander php folder and use them from that location
imagettftext ($im, $size, $angle, $left,$bottomleft , $col, "c:\php\fonts\arial.ttf", $text);
Ihope this will save some time for beginners
(at first, i enabled gd and tried times.ttf :-( this cost me a week to solve this problem i searched every website and find nearly nothing
aleczapka at gmx dot net
12-Jun-2002 01:21
Even if you don't intend to use PNGs, but only JPEG files with GD & PHP - you need to pass the --with-png parameter (in case PHP won't find it) to configure.
Otherwise you will get GD support = YES but functions like gdImageCreateFromJpeg won't work without png library.
stefan dot wehowsky at profilschmiede dot de
02-Feb-2002 09:57
If you ever want to resize a picture (maybe in order to create a thumbnail), this small function
should help you. It also gives you an idea of how some of the basic image functions of PHP can be
used.
/* resizeToFile resizes a picture and writes it to the harddisk
*
* $sourcefile = the filename of the picture that is going to be resized
* $dest_x = X-Size of the target picture in pixels
* $dest_y = Y-Size of the target picture in pixels
* $targetfile = The name under which the resized picture will be stored
* $jpegqual = The Compression-Rate that is to be used
*/
function resizeToFile ($sourcefile, $dest_x, $dest_y, $targetfile, $jpegqual)
{
/* Get the dimensions of the source picture */
$picsize=getimagesize("$sourcefile");
$source_x = $picsize[0];
$source_y = $picsize[1];
$source_id = imageCreateFromJPEG("$sourcefile");
/* Create a new image object (not neccessarily true colour) */
$target_id=imagecreatetruecolor($dest_x, $dest_y);
/* Resize the original picture and copy it into the just created image
object. Because of the lack of space I had to wrap the parameters to
several lines. I recommend putting them in one line in order keep your
code clean and readable */
$target_pic=imagecopyresampled($target_id,$source_id,
0,0,0,0,
$dest_x,$dest_y,
$source_x,$source_y);
/* Create a jpeg with the quality of "$jpegqual" out of the
image object "$target_pic".
This will be saved as $targetfile */
imagejpeg ($target_id,"$targetfile",$jpegqual);
return true;
}
ihayes at earthling dot net
19-Oct-2001 02:14
<p>With GD 2 and PHP 4.06 on win 2000, the TTF fonts need to be on the drive where the script is called from, not where PHP is installed.</p><p>I have PHP installed on drive C:. The scripts are on drive Q:. The fonts must be in stalled on Q:. </P><P>eg. The fonts are installed in "Q:\fonts" and must be referenced by "/fonts/<fontname>.ttf"
npdavis at hotmail dot com
24-May-2001 04:45
I build menus using image functions. I noticed that even if you preload the images, some do not always load. In addition the image generation puts a load on the server... the answer? Cache Control headers. These headers will cause IE and Netscape to load all images correctly and also force the proxys and web caches to cache them, allowing your pages to render correctly, AND save you lots of cycles: ) These headers tell both the browser and the ISP caches/proxys to cache the images.
Here is the code:
Header ("Last-Modified: " . gmdate("D, d M Y H:i:s",mktime (0,0,0,1,1,2000)) . " GMT"); // Date in the past
Header ("Expires: Mon, 26 Jul 2040 05:00:00 GMT"); // In other words... never expire the image
Header ("Cache-Control: max-age=10000000, s-maxage=1000000, proxy-revalidate, must-revalidate");//Cache-Control header is ESSENTIAL for forcing Netscape to load all images!... and telling the ISP caches to do the same in this case cache for 1 million seconds.
These headers may or may not be redundant... any input is welcome.
In addition, it is essential for proxys and ISP caches that your re-used images have the same url... IE create a generic image creation script, and feed it parameters. This way your
http://yoursite/imagegen.php?text=home&h=40&w=150&fontsize=13 Home link image has the same url on all of your pages... This will make your images more proxy/cacheserver cache AND browser cache friendly.
thx,
Neil
leefelix at pacific dot net dot hk
12-Mar-2001 04:12
For those of you who wants to compile PHP as Apache static module but failed in compiling Apache (undefined some PNG_XXX) functions, try re-ordering the -l parameters in Apache Makefiles (there are several) so that "-lgd is loaded before -lpng".
07-Mar-2001 05:29
When using ImageGif( $im ) it sends the output directly to the browser. to prevent this from happening and also to be able to save your new image to a database for example use ob_start(), ob_get_contents(), and ob_end_clean() <BR><BR>ex:<BR> <?php <BR>function ResizeGif( $image, $newWidth, $newHeight){
$srcImage = ImageCreateFromGif( $image );
$srcWidth = ImageSX( $srcImage );
$srcHeight = ImageSY( $srcImage );
if( $srcWidth < $srcHeight ){
$destWidth = $newWidth * $srcWidth/$srcHeight;
$destHeight = $newHeight;
}else{
$destWidth = $newWidth;
$destHeight = $newHeight * $srcHeight/$srcWidth;
}
$destImage = imagecreate( $destWidth, $destHeight);
ImageCopyResized( $destImage, $srcImage, 0, 0, 0, 0, $destWidth, $destHeight, $srcWidth, $srcHeight );
ImageGif( $destImage );
ImageDestroy( $srcImage );
ImageDestroy( $destImage );
}
ob_start();
ResizeGif( "/where/image/is/image.gif", "150", "150");
$resizedImage = ob_get_contents();
ob_end_clean();
rick at e-possibility dot com
28-Jul-2000 01:36
FINALLY -- here is what I had to do to compile PHP with image creation on FreeBSD4.0; I hope this is at least somewhat helpful to Linux users also:
(Notes: I used gmake instead of make, but if you don't have gmake, it should still work with 'make' and 'make install'. I used the DSO install method with Apache; I have not yet done this as a static linked install)
1. Assume X-windows, libpng, mysql, gmake and automake are already installed.
2. Install libjpeg (from
ftp://ftp.uu.net/graphics/jpeg/jpegsrc.v6b.tar.gz )
a) ./configure --enable-shared
b) gmake, gmake install
3. Install Freetype 1.3.1 (from http://www.freetype.org)
a) ./configure --enable-shared --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
b) gmake, gmake install
c) if freetype creates a freetype/ directory inside /usr/local/lib, copy all contents into /usr/local/lib
4. Install zlib 1.1.3 (from http://www.info-zip.org/pub/infozip/zlib/)
a) ./configure --shared
b) gmake, gmake install
5. Install gd-1.8.3 (from http://www.boutell.com/gd)
a) edit Makefile for correct include and lib dirs, and uncomment the lines that enable all options, while commenting out the default lines
b) edit gd.c; remove 1st three lines (if - endif for malloc.h)
c) edit gdcache.h and ...php-src/ext/gd/gdcache.h (if exists) and replace <malloc.h> with <stdlib.h>
d) copy /usr/X11R6/include/X11 to /usr/X11R6/include/X11/X11 (gd looks recursively inside X11 to X11/*)
e) gmake, gmake install
6. Install apache-1.3.12
a) ./configure --prefix=/usr/local/apache --enable-module=all --enable-shared=max
b) gmake, gmake install
7. Install PHP 4.0.1pl2
a) ./configure --prefix=/usr/local/php4 --with-mysql --with-apxs=/usr/local/apache/bin/apxs --enable-track-vars --with-gd=/usr/local/ --with-jpeg-dir=/usr/local --with-xpm-dir=/usr/X11R6 --with-zlib-dir=shared
b) gmake, gmake install
c) sometimes I have found you need to reboot the system completely instead of just restart httpd
have fun ;-)
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