README

Imagix is a library, based on GD, that aims to simplify the use of effects on images. This project is born with two ideas in mind :

• we usually just want to apply some effects without headaches
• we sometimes do not have a full control on the hosting server and therefore cannot rely on other image manipulation PHP extensions than GD

Install

composer require pyrsmk/imagix

Instantiating

The simplest way to instantiate an image is with the Imagix\Factory class (it uses Exif PHP extension to guess which adapter to load) :

$imagix=Imagix\Factory::forge('path/to/your/image/file.jpg');

It detects automatically the image type and loads the relevant adapter to use. But, if needed (and because it uses more resources), you can instantiate an image adapter by yourself :

$adapter=new Imagix\Adapter\PNG('path/to/your/image/file.png');
$imagix=new Imagix($adapter);

Here's the available image adapters :

• Imagix\Adapter\GIF
• Imagix\Adapter\JPEG
• Imagix\Adapter\PNG

Applying effects

A quick example :

// Convert image to grayscale
$imagix->grayscale();
// Resize the image to a maximum of 600x400 by keeping the ratio
$imagix->resize(600,400);
// Add a black border of 3px around the image
$imagix->border(3);
// Save the image
$imagix->save('mynewimage.jpg');

There's more than 30 sugar effects you can use. Some of them are only available when PHP has been compiled with the bundled version of GD. It's generally the case but not on Debian systems.

• * : only available with the GD bundle

• # : the effect is resource-hungry

• [*] addition($color,$opacity=100) : add a color to the image; it takes an HTML color for the $color parameter

• [*] blur($method=SELECTIVE) : blur the image; it supports GAUSSIAN and SELECTIVE blur methods

• border($thickness,$color='#000000',$sides=ALL) : draw a border around the image; support side constants are ALL (by default), TOP, RIGHT, BOTTOM, LEFT

• [*] brightness($level) : adjust the brightness; the brightness level must be between -255 and 255 (included)

• [#] channels($r,$g,$b) : make some adjustments on RGB channels; each channel takes one of these constants : NONE, RED, GREEN, BLUE, MINIMIZE, MAXIMIZE

• [*] contrast($level) : adjust the contrast of the image

• corner($size=10,$type=ROUNDED,$corners=ALL) : apply a mask to each corner of the image to make them rounded or truncated (per example); the $type paramater supports ROUNDED, BEVELLED and TRUNCATED methods; the $corners parameter accepts ALL, TOPLEFT, TOPRIGHT, BOTTOMRIGHT and BOTTOMLEFT constants

• crop($x,$y,$width,$height) : crop an image

• [#] duotone($r,$g,$b) : apply a duotone effect; the RGB parameters are an amount that will be added to the RGB channels of the image

• [*] edge() : apply an edge effect

• [*] emboss($method=MATRIX) : emboss the image; MATRIX and FILTER methods are supported

• enhance() : enhance an image

• gamma($input,$output) : adjust the gamma correction

• [*] grayscale() : convert an image to grayscale

• [#] hsla($h,$s,$l,$a) : modify the HSLA channels of an image

• [#] hsva($h,$s,$v,$a) : modify the HSVA channels of an image

• interlace() : interlace the image

• line($x1,$y1,$x2,$y2,$thickness=1,$color='#000000') : draw a line on the image

• lines($direction=HORIZONTAL,$step=2,$thickness=1,$color='#000000') : draw several lines on the image; it supports HORIZONTAL and VERTICAL constants for the $direction parameter; the $step parameter is the size in pixels where a new line should be drawed

• [#] mask($mask,$x,$y) : apply a mask on the image; the $mask parameter is a GD resource; the $x and $y parameters specify where the mask should be applied

• matrix($matrix,$color_offset) : apply a matrix to the image; for further informations read the documentation of imageconvolution()

• merge($image,$method=NORMAL,$x1,$y1,$x2,$y2,$src_w,$src_h,$pct) : merge two images; please read the imagecopymerge() documentation to have further informations on how to set the parameters; the $method parameter takes either the NORMAL or GRAYSCALE constant

• [*] negate() : negate the image

• [#] noise($level=5) : add noise to the image

• [*] pixelate($block_size=2,$advanced=true) : pixelate the image

• ratio($w_ratio,$h_ratio,$position=CENTERED) : apply a ratio to the image; supports CENTERED (by default), TOP, RIGHT, BOTTOM and LEFT constants as position

• resize($width,$height,$keep_ratio=true) : resize the image; if $keep_ratio is true it will consider the specified resolution as the maximum resolution to reach (explicitly, your image may not be of the size you specified); you can only pass a percent value for the width parameter to resize your image directly with a ratio

• [*] rotate($angle,$background='#FFFFFF') : rotate the image by the specified angle

• [#] scatter($level=1) : apply a scatter effect

• screen() : apply a screen effect

• [*] sepia() : apply a sepia effect

• [*] sharpen($method=MATRIX) : apply a sharpen effect; supported constant methods are MATRIX (by default) and FILTER

• shift() : shift the image

• [*] smooth() : apply a smooth effect

• truecolor() : convert the image to true colors

Advanced image handling

The API of Imagix\Image :

• getAdapter() : get the used adapter
• getWidth() : get the width of the image
• getHeight() : get the height of the image
• save($path,$options) : save the image

The API of all adapters :

• getResource() : get the GD resource of the image
• setResource($resource) : set the resource of the image
• getPath() : get the path of the source image
• getContents() : get the image contents
• getMimetype() : get the MIME type

The save() method can take specific options for the image to save.

// For the JPEG adapter
$imagix->save('image.jpg',array(
    // defaults to 80
    'quality' => 95
));
// For the PNG adapter
$imagix->save('image.jpg',array(
    // a value between 0 and 9 (by default)
    'quality' => 7,
    // for a better understanding on PNG filters, take a look at :
    // https://stackoverflow.com/questions/3048382/in-php-imagepng-accepts-a-filter-parameter-how-do-these-filters-affect-the-f
    'filters' => PNG_NO_FILTER
));

If you want to export an image to another format :

$png_adapter=new Imagix\Adapter\PNG('image.png');
$image=new Imagix\Image(new Imagix\Adapter\JPEG($png_adapter));
$image->save('image.jpg');

When processing a lot of images, we advise you to free allocated memory when you're done with one image :

imagedestroy($imagix->getAdapter()->getResource());

License

Imagix is released under the MIT license.