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Basic Tutorial: PHP GD - basic tuts | ||
Discussion by r3d with 17 Replies.
Last Update: January 6, 2010, 3:29 pm (View Latest) | Page 1 of 2 pages. | ||
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With php gd is the image function library of php. The functions include in this library enable php users to creating image up to manipulating photos. PHP gd can create with file extension of jpg, gif, swf, tiff and jpeg2000.
Installation see http://www.php.net/manual/en/ref.image.php. Astahost hosting service has enable gd library, so won’t need any extra works except in coding.
Lets get started, creating images from php
set the canvas:
imagecreatethis function create and set a blank canvas with the wide of 250 pixels and height of 80 pixels.
setting the basic colors:
$white = imagecolorallocate($img, 255, 255, 255)
$red = imagecolorallocate($img, 255, 0, 0)
$green = imagecolorallocate($img, 0, 0, 255)
imagecolorallocate $img represent the canvas. the next three value is color value in rgb(0-255), you also set the color in hex (0x00 – 0xff).
drawing a something:
imagerectangle this function create a rectangle a width of 230[240(x2) – 10(x1)] and a height of 60[70(y2) – 10(y1)]. $img the canvas, the first two value sets the starting point(x1, y1) . and last two number is the ending(x2, y2). And the last value is the color.
imagefilledrectangle this function create a filled rectangle with a color red. All values is the same as the imagerectangle function.
imagefilledellipse this one creates an ellipse(circular objects). $img is the canvas, the first two value(cx, cy) set the origin(center) of the ellipse. The third value set the width(horizontal width) and fifth one is the height(vertical width). Last but not the least the color value.
0 => 190,
1 => 60,
2 => 210,
3 => 20,
4 => 230,
5 => 60,
);
imagefilledpolygon($img, $corners, 3, $white);
imagefilledellipse and the last drawing function I discuss is a polygon function, in the example there’s only 3 corners. The first value is the canvas, the second one is the corners in array, the value 3 is the number of vertices, and the last one is color.
Showing the graphics:
imagejpeg($img)
header imagejpeg To output the image you must first send the appropriate header, in this example I use jpg extension and the content type is set to “image/jpeg”. And call the imagejpeg function to create the images and shown up to the browser. For other file type such as png(image/png), gif(image/gif), windows bitmap(image/vnd.wap.wbmp), check php manual for details.
And finally, use the imagedestroy function just to clear up the memory used by the imagecreate functions.
Final code should look like this.
$img = imagecreate(250,80);
$black = imagecolorallocate($img, 0, 0, 0);
$white = imagecolorallocate($img, 255, 255, 255);
$red = imagecolorallocate($img, 255, 0, 0);
$green = imagecolorallocate($img, 0, 255, 0);
$blue = imagecolorallocate($img, 0, 0, 255);
$corners = array(
0 => 190,
1 => 60,
2 => 210,
3 => 20,
4 => 230,
5 => 60,
);
imagerectangle($img, 10, 10, 240, 70, $white);
imagefilledrectangle($img, 20, 20, 60, 60, $red);
imagefilledellipse($img, 90, 40, 40, 40, $blue);
imagefilledellipse($img, 150, 40, 70, 40, $green);
imagefilledpolygon($img, $corners, 3, $white);
header ("Content-type: image/jpeg");
imagejpeg($img);
imagedestroy($img);
?>
enjoy
Installation see http://www.php.net/manual/en/ref.image.php. Astahost hosting service has enable gd library, so won’t need any extra works except in coding.
Lets get started, creating images from php
set the canvas:
CODE
$img = imagecreate(250, 80)imagecreatethis function create and set a blank canvas with the wide of 250 pixels and height of 80 pixels.
setting the basic colors:
CODE
$black = imagecolorallocate($img, 0, 0, 0)$white = imagecolorallocate($img, 255, 255, 255)
$red = imagecolorallocate($img, 255, 0, 0)
$green = imagecolorallocate($img, 0, 0, 255)
imagecolorallocate $img represent the canvas. the next three value is color value in rgb(0-255), you also set the color in hex (0x00 – 0xff).
drawing a something:
CODE
imagerectangle($img, 10, 10, 240, 70, $white)imagerectangle this function create a rectangle a width of 230[240(x2) – 10(x1)] and a height of 60[70(y2) – 10(y1)]. $img the canvas, the first two value sets the starting point(x1, y1) . and last two number is the ending(x2, y2). And the last value is the color.
CODE
imagefilledrectangle($img, 20, 20, 60, 60, $red)imagefilledrectangle this function create a filled rectangle with a color red. All values is the same as the imagerectangle function.
CODE
imagefilledellipse($img, 90, 40, 40, 40, $blue)imagefilledellipse this one creates an ellipse(circular objects). $img is the canvas, the first two value(cx, cy) set the origin(center) of the ellipse. The third value set the width(horizontal width) and fifth one is the height(vertical width). Last but not the least the color value.
CODE
$corners = array(0 => 190,
1 => 60,
2 => 210,
3 => 20,
4 => 230,
5 => 60,
);
imagefilledpolygon($img, $corners, 3, $white);
imagefilledellipse and the last drawing function I discuss is a polygon function, in the example there’s only 3 corners. The first value is the canvas, the second one is the corners in array, the value 3 is the number of vertices, and the last one is color.
Showing the graphics:
CODE
header("Content-type: image/jpeg")imagejpeg($img)
header imagejpeg To output the image you must first send the appropriate header, in this example I use jpg extension and the content type is set to “image/jpeg”. And call the imagejpeg function to create the images and shown up to the browser. For other file type such as png(image/png), gif(image/gif), windows bitmap(image/vnd.wap.wbmp), check php manual for details.
And finally, use the imagedestroy function just to clear up the memory used by the imagecreate functions.
Final code should look like this.
CODE
<?php$img = imagecreate(250,80);
$black = imagecolorallocate($img, 0, 0, 0);
$white = imagecolorallocate($img, 255, 255, 255);
$red = imagecolorallocate($img, 255, 0, 0);
$green = imagecolorallocate($img, 0, 255, 0);
$blue = imagecolorallocate($img, 0, 0, 255);
$corners = array(
0 => 190,
1 => 60,
2 => 210,
3 => 20,
4 => 230,
5 => 60,
);
imagerectangle($img, 10, 10, 240, 70, $white);
imagefilledrectangle($img, 20, 20, 60, 60, $red);
imagefilledellipse($img, 90, 40, 40, 40, $blue);
imagefilledellipse($img, 150, 40, 70, 40, $green);
imagefilledpolygon($img, $corners, 3, $white);
header ("Content-type: image/jpeg");
imagejpeg($img);
imagedestroy($img);
?>
enjoy
Sun Oct 24, 2004 Reply New Discussion
Very nice tutorial, well written and very descriptive. I had no clue you could do this with php. I guess you learn something new every day.
Time to go play with this stuff.
Time to go play with this stuff.
Sun Oct 24, 2004 Reply New Discussion
well, to give you an idea what you could use this for: thumbnails
i'm a lazy kid so i upload my pictures with ftp
then some guy/girl visits my site and my picture page
he opens the directory with the new pictures
the script checks all the pictures and checks if they all have a thumbnail
(if a filed is called blabla.jpg, the thumb is called .blabla.jpg, so it's invisible too)
if there isn't, i make one with gd!!! it's great. i never have to make pages anymore, never make thumbs,...
gd rocks quite a lot!
i'm a lazy kid so i upload my pictures with ftp
then some guy/girl visits my site and my picture page
he opens the directory with the new pictures
the script checks all the pictures and checks if they all have a thumbnail
(if a filed is called blabla.jpg, the thumb is called .blabla.jpg, so it's invisible too)
if there isn't, i make one with gd!!! it's great. i never have to make pages anymore, never make thumbs,...
gd rocks quite a lot!
Sun Oct 24, 2004 Reply New Discussion
hm, apearently it's not working atm. it worked before, but today it's all ****ed up.
php says it doesn't know the function imagecreatefromjpeg... help!
php says it doesn't know the function imagecreatefromjpeg... help!
Sun Oct 24, 2004 Reply New Discussion
Maybe the GD library is not enabled...
Wait for tomorrow and see what happends...
By the way... I made a picture gallery with PHP+GD...
If anyone would like to I can make a tutorial to create thumbnails and stuff...
Also an advice:
Don't use:
That could make your pictures look preaty bad...
Use:
That makes it look exactly like is and you won't lose the image quality...
If you can't use the GD library you could use ImageMagic too.. is a library that can do the same and more...
Hope it helps...
Wait for tomorrow and see what happends...
By the way... I made a picture gallery with PHP+GD...
If anyone would like to I can make a tutorial to create thumbnails and stuff...
Also an advice:
Don't use:
CODE
imagecreate($width,$height)That could make your pictures look preaty bad...
Use:
CODE
imagecreatetruecolor($width,$height)That makes it look exactly like is and you won't lose the image quality...
If you can't use the GD library you could use ImageMagic too.. is a library that can do the same and more...
Hope it helps...
Sun Oct 24, 2004 Reply New Discussion
yeah, but all the extensions are disabled atm
gd, exif,...
i am using truecolor, don't worry
it works fine on my own computer, but it's not working with astahost. but i've heard/read that they are having problems, so i'll just wait till those are solved...
gd, exif,...
i am using truecolor, don't worry
it works fine on my own computer, but it's not working with astahost. but i've heard/read that they are having problems, so i'll just wait till those are solved...
Sun Oct 24, 2004 Reply New Discussion
outch
astahost hosting has no gd support for the moment, may be... this is part of the problem . and the tutorial won't work at this time. plz be patient while the admin is fixing this
astahost hosting has no gd support for the moment, may be... this is part of the problem . and the tutorial won't work at this time. plz be patient while the admin is fixing this
Mon Oct 25, 2004 Reply New Discussion
QUOTE (r3d)
Final code should look like this.CODE
<?php$img = imagecreate(250,80);
$black = imagecolorallocate($img, 0, 0, 0);
$white = imagecolorallocate($img, 255, 255, 255);
$red = imagecolorallocate($img, 255, 0, 0);
$green = imagecolorallocate($img, 0, 255, 0);
$blue = imagecolorallocate($img, 0, 0, 255);
$corners = array(
0 => 190,
1 => 60,
2 => 210,
3 => 20,
4 => 230,
5 => 60,
);
imagerectangle($img, 10, 10, 240, 70, $white);
imagefilledrectangle($img, 20, 20, 60, 60, $red);
imagefilledellipse($img, 90, 40, 40, 40, $blue);
imagefilledellipse($img, 150, 40, 70, 40, $green);
imagefilledpolygon($img, $corners, 3, $white);
header ("Content-type: image/jpeg");
imagejpeg($img);
imagedestroy($img);
?>
enjoy
[post="5905"]<{POST_SNAPBACK}>[/post]
Is there a way to save it somewhere on the server as a jpg, gif or png with a filename before imagedestroy($img)?
Thu Oct 28, 2004 Reply New Discussion
QUOTE (r3d)
outch astahost hosting has no gd support for the moment, may be... this is part of the problem . and the tutorial won't work at this time. plz be patient while the admin is fixing this
[post="5942"]<{POST_SNAPBACK}>[/post]
Can we request for it to be installed.
gd and magick is fabulous for auto image generation.
Freetype is oftenly required too, you will be happy to find out what it can do.
Thu Oct 28, 2004 Reply New Discussion
please don't double post, use the edit button
about the gd it's allready installed. and about your first question no, it must be save as php or it will not be parse, just a suggestion u can do something like this image.php?id=image_name with the gd
about the gd it's allready installed. and about your first question no, it must be save as php or it will not be parse, just a suggestion u can do something like this image.php?id=image_name with the gd
Thu Oct 28, 2004 Reply New Discussion
good tutorial but see I have a problem using GD. Coz I dont have the GD library. I visited the www.boutell.com and downloaded the GD Library but couldnot compile it for PHP. And they dont provide a DLL for PHP now...
Where Can I get the GD library? Refer me good sites for the same.
Where Can I get the GD library? Refer me good sites for the same.
Thu Nov 18, 2004 Reply New Discussion
ok, a short sum up on some of the question.
saving as a jpeg: he tried but forgot the filename
imagejpeg ( $img, test.jpg , 78);
that'll do the trick
2. gd is installed on astahost. no problem. you can use it as you wish
3. installing gd on your own pc.
i guess you are using a windows machine as you mentioned dll. well, you have the dll, it's packed with php. what you need to do is find the lines that say which extensions to use.
unquote the extension that says gd.dll or gd2.dll
(you can do this by removing the ; in front of the line)
restart your iis or apache server.
done!
saving as a jpeg: he tried but forgot the filename
imagejpeg ( $img, test.jpg , 78);
that'll do the trick
2. gd is installed on astahost. no problem. you can use it as you wish
3. installing gd on your own pc.
i guess you are using a windows machine as you mentioned dll. well, you have the dll, it's packed with php. what you need to do is find the lines that say which extensions to use.
unquote the extension that says gd.dll or gd2.dll
(you can do this by removing the ; in front of the line)
restart your iis or apache server.
done!
Fri Nov 19, 2004 Reply New Discussion
php 4.9+ use gd2 which is bundled in the installation by default. but not enable by default. read marijnn's post and put the gd2.dll in windows folder also some dll is required like icon.dll you should put this dll in window folder too
Fri Nov 19, 2004 Reply New Discussion
QUOTE (marijnnn)
ok, a short sum up on some of the question.saving as a jpeg: he tried but forgot the filename
imagejpeg ( $img, test.jpg , 78);
that'll do the trick
2. gd is installed on astahost. no problem. you can use it as you wish
3. installing gd on your own pc.
i guess you are using a windows machine as you mentioned dll. well, you have the dll, it's packed with php. what you need to do is find the lines that say which extensions to use.
unquote the extension that says gd.dll or gd2.dll
(you can do this by removing the ; in front of the line)
restart your iis or apache server.
done!
[post="7656"]<{POST_SNAPBACK}>[/post]
Thanks I will Try that...
Sun Nov 21, 2004 Reply New Discussion
What is actually the path for GD graphics library? I need it for my coppermine galery.
I would like to upload it manually because I'm using my own database...but I don't know the path for the GD. I have a backup of the mysql database I already used on a different server. It works fine, but just the thumbnails are not displayed.
Maybe somebody knows how to install/use GD for a coppermine picture galery? Thanks in advance for your help.
I would like to upload it manually because I'm using my own database...but I don't know the path for the GD. I have a backup of the mysql database I already used on a different server. It works fine, but just the thumbnails are not displayed.
Maybe somebody knows how to install/use GD for a coppermine picture galery? Thanks in advance for your help.
Tue Dec 28, 2004 Reply New Discussion
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