imagemagick

RFD ImageMagick library.

Requirements

• ImageMagick must be in your $PATH (e.g. /usr/bin/convert)
• PHP must be able to run exec()

Usage

composer require rfd/imagemagick

<?php

use Rfd\ImageMagick\ImageMagick;
use Rfd\ImageMagick\CLI\Operation\Factory as OperationFactory;
use Rfd\ImageMagick\Image\File;
use Rfd\ImageMagick\Options\CommonOptions;

require __DIR__ . '/vendor/autoload.php';

$im = new ImageMagick(new OperationFactory());

$image = new File('/path/to/your/image.png');
$output = new File('/path/to/output/image.jpg');

$operation_builder = $im->getOperationBuilder($image);

$operation_builder
    ->resize()
        ->setWidth(320)
        ->setHeight(240)
        ->setGravity(CommonOptions::GRAVITY_CENTER)
    ->next()
    ->slice()
        ->setWidth(300)
        ->setHeight(200)
        ->setOffsetX(0)
        ->setOffsetY(0)
        ->setGravity(CommonOptions::GRAVITY_NORTHWEST)
    ->finish($output);

About

Included Functionality

Included is only a few commands that we've found useful at RedFlagDeals. You're able to string them together to get most common things done.

Commands

Slice

Extracts a rectangle from the image based on the width, height, offset X, offset Y, and gravity.

Resize

Resizes the image based on the width, height, gravity and resize mode

Modes

CommonOptions::MODE_ONLY_SHRINK_LARGER Will only shrink the image if it is larger than the requested dimensions. Otherwise it leaves the image alone. See: http://www.imagemagick.org/Usage/resize/#shrink

CommonOptions::MODE_FILL_AREA will resize to the smallest dimension. See: http://www.imagemagick.org/Usage/resize/#fill

CommonOptions::MODE_FILL_AREA_OR_FIT will shrink to fill the area if the image is larger than the requested width and height. Otherwise it will increase the image's size to fit within the width and height.

CommonOptions::MODE_RESIZE_ABSOLUTE doesn't care about the aspect ratio and forces the image to be exactly the requested width and height. See: http://www.imagemagick.org/Usage/resize/#noaspect

Convert

Some defaults are set at CommonOptions::FORMAT_* it will force the output mode to a specific image type. Any string that ImageMagick recognizes as an image format will be accepted.

SequenceNumber

This lets you choose a specific page or frame from a PDF or gif, respectively. NB: index starts at 0.

Watermark

Could also be called "Composite." This takes one image, resizes it to 98% the size of another image, and slaps it on top. If you use an image with transparency (like we do) you get a nice watermark.

Info

Returns an array of image information from Result->getExtra(). This is an "Instant" operation. Nothing after it will be processed.

Compare

Returns a float value or "inf" on Result->getExtra() and an image with the compare result on Result->getImage(). This is an "Instant" operation. Nothing after it will be processed.

Blur / Gaussian Blur

Blurs the image by radius and sigma. Blur is faster, Gaussian Blur is smoother. See: http://www.imagemagick.org/Usage/blur/

Quality

Sets the output quality of the image. Generally only useful with lossy formats like JPEG. With PNG, it determines the compression. See: http://www.imagemagick.org/script/command-line-options.php#quality

Strip

Removes profile information from the image. See: http://www.imagemagick.org/script/command-line-options.php#strip

Add Profile, Remove Profile

Adds or removes profile information to the image. AddProfile expects a file name. RemoveProfile expects a profile name. See: http://www.imagemagick.org/script/command-line-options.php#profile

$operation_builder->addProfile('RGB.icc')
    ->removeProfile('!exif,*')

Be careful, though. Each usage of these methods causes the image to be converted in memory from one profile to another. Read the doc carefully!

Color Space

Define the color space to use with the image. A subset of the most common color spaces are included in CommonOptions::COLOUR_SPACE_* See: https://www.imagemagick.org/script/command-line-options.php#colorspace

$operation_builder->setColorSpace(CommonOptions::COLOUR_SPACE_RGB)

Processing Images

All processing is done after the command has been built by calling Builder->finish(). If a subclass of Image is provided, it will call Image->setImageData() on it.

Instant Operations

Currently there are two "instant" operations, Info and Compare. Due to the nature of the information returned, it doesn't make sense to continue processing.

One-Shot Operations

One-Shot operations can take parameters when the operation is requested, instead of having to use ->next().

// These two are exactly the same:

$operation_builder->format(CommonOptions::FORMAT_JPG)
    ->...;

$operation_builder->format()
    ->setFormat(CommonOptions::FORMAT_JPG)
    ->next()
    ->...;

Quality, Format, AddProfile, RemoveProfile, and Strip can be called this way.

// Strip is called without parameters
$operation_builder->strip()->...;

Notes

Only works on the command line

We've never used the IMagick PECL extension. The implementation provided is completely CLI-based. The command line is built, then run when Builder->finish() is called.

ImageMagick Version

This library was built against ImageMagick 6.7.7-10 Q16 on Linux. The PHPUnit tests MAY fail when comparing images in different versions. Improvements to the tests to help with this would be greatly appreciated.

Windows Compatibility

It should be windows-compatible, we've done a small amount of testing on Windows and there are little fixes for it in the code. However, there is no guarantee that it will work flawlessly on Windows.

Contributing

Pull requests are welcome and encouraged! We know there's a lot that hasn't been implemented yet.