Imagick PHP Class Primer Tutorial
We’re talking “class” today. Up until now, regarding the great ImageMagick suite of software, and it’s interactions with PHP, we’ve …
- been using exec style calls of ImageMagick, mainly via it’s convert command line functionality, via our CentOS web server … but today we’re …
- introducing a (new for us, on AlmaLinux) modus operandi whereby a PHP Imagick class can be used to make calls to a myriad of calls within this software suite, with us just picking a few to introduce ourselves to … thanks to https://www.php.net/manual/en/book.imagick.php and https://www.php.net/manual/en/imagick.contraststretchimage.php primarily, here
… in a first draft not installed here on CentOS but okay here with AlmaLinux. Am sure most people would concur that this is much more integrated approach for PHP …
<?php
// oil_painting_thumbnail.php
// RJM Programming - August, 2024
// Start using PHP Imagick class
$image=null;
if (!isset($_GET['image']) && !isset($_POST['image'])) {
echo "<html><head><scr" . "ipt type=text/javascript> function ask() { var bsh=prompt('See the default brightness, saturation, hue settings, black point %, white point % and change as desired ... 100,0,100,90,95 is grayscale ... darkest 90% of pixels are turned black, the brightest 5% are made white, and those between 90% and 95% are grey-scaled', document.getElementById('brightness').value + ',' + document.getElementById('saturation').value + ',' + document.getElementById('hue').value + ',' + document.getElementById('blackpoint').value + ',' + document.getElementById('whitepoint').value); if (bsh != null) { if (eval('' + bsh.split(',').length) == 5) { document.getElementById('brightness').value=bsh.split(',')[0]; document.getElementById('saturation').value=bsh.split(',')[1]; document.getElementById('hue').value=bsh.split(',')[2]; document.getElementById('blackpoint').value=bsh.split(',')[3]; document.getElementById('whitepoint').value=bsh.split(',')[4]; } } return true; } </scr" . "ipt></head><body><h1>Imagick Ideas</h1><h3>RJM Programming - August, 2024 ... thanks to https://www.php.net/manual/en/book.imagick.php and https://www.php.net/manual/en/imagick.contraststretchimage.php</h3><br><br><form action='./oil_painting_thumbnail.php' id=myform method=GET><input type=hidden name=brightness value=100 id=brightness></input><input type=hidden name=saturation value=0 id=saturation></input><input type=hidden name=hue value=100 id=hue></input><input type=hidden name=blackpoint value=90 id=blackpoint></input><input type=hidden name=whitepoint value=95 id=whitepoint></input><input style='width:70%;' type=text placeholder='Image to process ...' name=image id=image value=''></input><br><br><input onclick=\" document.getElementById('myform').method='GET'; \" type=submit style=background-color:orange; value=Negate></input> <input style=background-color:yellow; onclick=\" if (ask()) { document.getElementById('myform').method='POST'; } \" type=submit value='Contrast Stretch'></input></form></body></html>";
} else {
if (isset($_GET['image'])) {
header('Content-type: image/jpeg');
//Instantiate a new Imagick object
$image = new Imagick(realpath(urldecode($_GET['image'])));
$image->negateImage(false);
// If 0 is provided as a width or height parameter,
// aspect ratio is maintained
$image->thumbnailImage(100, 0);
echo $image;
exit;
} else {
//Instantiate a new Imagick object
$image = new Imagick(realpath(urldecode($_POST['image'])));
list($width, $height) = array_values ($image->getImageGeometry());
$b=(isset($_POST['brightness']) ? $_POST['brightness'] : '100');
$s=(isset($_POST['saturation']) ? $_POST['saturation'] : '0');
$h=(isset($_POST['hue']) ? $_POST['hue'] : '100');
$bp=(isset($_POST['blackpoint']) ? $_POST['blackpoint'] : '90');
$wp=(isset($_POST['whitepoint']) ? $_POST['whitepoint'] : '95');
$image->modulateImage($b, $s, $h);
$image->contrastStretchImage($width * $height * ($bp / 100.0), $width * $height * ($wp / 100.0));
$image->writeImage('example_thumbnail.jpg');
echo "<html><body><p>My Changed Image " . urldecode($_POST['image']) . " ... brightness " . $b . ", saturation " . $s . ", hue " . $h . ", black point % " . $bp . "%, white point % " . $wp . "%</p><br><img src='./example_thumbnail.jpg'></img></body></html>";
exit;
}
}
?>
… to interface to the great ImageMagick image manipulation software.
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