Crop image in PHP

Question 1

The code below crops the image well, which is what i want, but for larger images, it wotn work as well. Is there any way of 'zooming out of the image'

Idealy i would be able to have each image roughly the same size before cropping so that i would get good results each time

Code is

<?php

$image = $_GET['src']; // the image to crop
$dest_image = 'images/cropped_whatever.jpg'; // make sure the directory is writeable

$img = imagecreatetruecolor('200','150');
$org_img = imagecreatefromjpeg($image);
$ims = getimagesize($image);
imagecopy($img,$org_img, 0, 0, 20, 20, 200, 150);
imagejpeg($img,$dest_image,90);
imagedestroy($img);
echo '<img src="'.$dest_image.'" ><p>';

Question 2

If you are trying to generate thumbnails, you must first resize the image using imagecopyresampled();. You must resize the image so that the size of the smaller side of the image is equal to the corresponding side of the thumb.

For example, if your source image is 1280x800px and your thumb is 200x150px, you must resize your image to 240x150px and then crop it to 200x150px. This is so that the aspect ratio of the image won't change.

Here's a general formula for creating thumbnails:

$image = imagecreatefromjpeg($_GET['src']);
$filename = 'images/cropped_whatever.jpg';

$thumb_width = 200;
$thumb_height = 150;

$width = imagesx($image);
$height = imagesy($image);

$original_aspect = $width / $height;
$thumb_aspect = $thumb_width / $thumb_height;

if ( $original_aspect >= $thumb_aspect )
{
   // If image is wider than thumbnail (in aspect ratio sense)
   $new_height = $thumb_height;
   $new_width = $width / ($height / $thumb_height);
}
else
{
   // If the thumbnail is wider than the image
   $new_width = $thumb_width;
   $new_height = $height / ($width / $thumb_width);
}

$thumb = imagecreatetruecolor( $thumb_width, $thumb_height );

// Resize and crop
imagecopyresampled($thumb,
                   $image,
                   0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
                   0 - ($new_height - $thumb_height) / 2, // Center the image vertically
                   0, 0,
                   $new_width, $new_height,
                   $width, $height);
imagejpeg($thumb, $filename, 80);

Haven't tested this but it should work.

EDIT

Now tested and working.

Question 3

Check out imagettfbbox: http://www.php.net/manual/en/function.imagettfbbox.php. It will give you the extents of the text you wish to render. Then it's simple arithmetic to center that on your image.

Question 4

You can download wkhtmltoimage from this link. There is a version for all operating systems so that shouldn't be a problem. Then you can use it like so:

$path="wkhtmltoimg/wkhtmltoimage.exe"; //path to your executable
$url="http://google.com";
$output_path="test.png";
shell_exec("$path $url $output_path");

One thing you want to note is that if PHP is in safe mode, shell_exec will not work and you won't be able to do your conversion.

Question 5

0, Install PHP development package. Also You should have installed PHP with GD extension (but not bundled)

sudo apt-get install php5-dev

1, Download source code of used PHP (for me 5.6.18)

wget http://cz2.php.net/get/php-5.6.18.tar.gz/from/this/mirror -O php-5.6.18.tar.gz

2, Extract archive

tar -xzf php-5.6.18.tar.gz

3, Go to the source code of GD extension

cd php-5.6.18/ext/gd/

4, Prepare the extension (run phpize in that directory)

phpize

5, Now the configure command

5.1, The arguments depends on Your linux distribution. My was these:

--with-freetype-dir=shared,/usr --with-vpx-dir=shared,/usr --with-jpeg-dir=shared,/usr --with-xpm-dir=shared,/usr/X11R6

5.2, For getting paths for libraries You must run this command and search only the search arguments, which are specified above (5.1)

php-config --configure-options

5.3, Also add this arguments for configure (the second argument makes bundled version)

--with-php-config=/usr/bin/php-config --with-gd

6, Final configure command

sudo ./configure --with-php-config=/usr/bin/php-config --with-gd --with-freetype-dir=YOUR_VALUE --with-vpx-dir=YOUR_VALUE --with-jpeg-dir=YOUR_VALUE --with-xpm-dir=YOUR_VALUE

7, Now run make

make

8, After compiling You should see something like this:

Libraries have been installed in:
   /home/jakub/php-5.6.18/ext/gd/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------

Build complete.
Don't forget to run 'make test'.

So in the directory modules You have compiled bundled extension gd.so. 9, Replace NOT bundled gd.so by Your new compiled bundled extension, for my version of PHP It was command:

sudo cp -f ./gd.so /usr/lib/php5/20131226/gd.so

10, Restart Apache

sudo service apache2 restart

Hope this helps! and will You spend less time than me.

Question 6

You can actually do that with ImageMagick ... See Crop or mask an image into a circle and Crop image into circle and add border for good examples

Crop image in PHP

Answers

php,gd,crop