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ImageScaler

Handy tool for image resizing. Produces well optimized images for web.

Supported input and output formats: JPEG, PNG, GIF (including animated), WebP, AVIF, HEIC.

Requirements

• PHP >= 7.4
• ext-imagick >= 3.4
• pngquant (optional, required only for PngquantOptimizer filter)

Basic Usage

$scaler = new Pupiq\ImageScaler("/path/to/image.jpg");

// getting info about image
$scaler->getImageWidth(); // e.g. 1920
$scaler->getImageHeight(); // e.g. 1080
$scaler->getOrientation(); // 0, 1, 2 or 3 (i.e. 0, 90, 180, 270 degrees clockwise)
$scaler->getMimeType(); // "image/jpeg"

// performing a transformation
$scaler->scaleTo(300,200,["keep_aspect" => true]);

// saving to output file
$scaler->saveTo("/path/to/output_file.jpg");
// or saving to string
// $image = $scaler->saveToString();

// checking the result
$scaler_out = new Pupiq\ImageScaler("/path/to/output_file.jpg");
$scaler_out->getImageWidth(); // 300
$scaler_out->getImageHeight(); // 169

EXIF orientation is detected automatically for JPEG images. The image is rotated accordingly so that the output is always correctly oriented.

Scaling options

There are plenty of options in method scaleTo(). Some of them are mutually exclusive and should not be used together.

$scaler->scaleTo($width, $height, [
  "orientation" => 0, // automatically detected from EXIF; 0, 1, 2 or 3 (i.e. 0, 90, 180, 270 degrees clockwise)

  // source crop area within the original image
  "x" => 0,
  "y" => 0,
  "width" => $image_width,
  "height" => $image_height,

  // keep_aspect and crop are mutually exclusive
  "keep_aspect" => false,
  "crop" => null, // null, true/"auto", "top", "bottom"

  "strip_meta_data" => true,
  "sharpen_image" => null, // true, false, null (auto: sharpens when downscaling by more than 20%)
  "compression_quality" => 85,
  "auto_convert_cmyk_to_rgb" => true,

  "output_format" => "jpeg", // "jpeg", "png", "gif", "webp", "avif", "heic"

  "background_color" => "#ffffff", // defaults to "transparent" for png, gif, webp and avif
]);

Typical usages

// Scale image to 200px width, preserve aspect ratio.
$scaler->scaleTo(200);

// Scale image to 200px height, preserve aspect ratio.
$scaler->scaleTo(null, 200);

// Scale image to fit into a 200x200 box.
// Aspect ratio is preserved; any remaining space is filled with background_color.
$scaler->scaleTo(200, 200, ["background_color" => "#ffffff"]);

// Scale image to fit within 200x200.
// The output may be smaller than 200x200 in one dimension.
$scaler->scaleTo(200, 200, ["keep_aspect" => true]);

// Scale and crop the image to exactly 200x200.
// The crop is centred.
$scaler->scaleTo(200, 200, ["crop" => true]);

// Scale and crop to 200x200, preserving the top part of the image.
// Great for portrait photos, magazine covers, etc.
$scaler->scaleTo(200, 200, ["crop" => "top"]);

// Scale and crop to 200x200, preserving the bottom part of the image.
$scaler->scaleTo(200, 200, ["crop" => "bottom"]);

Format conversion

The output format can be changed independently of the input format. To convert a JPEG to WebP:

$scaler = new Pupiq\ImageScaler("/path/to/image.jpg");
$scaler->scaleTo(800, null, ["output_format" => "webp"]);
$scaler->saveTo("/path/to/output_image.webp");

Any combination of supported input and output formats is accepted.

Filters

Image processing can be extended with filters. There are two types of filters.

• After scale filters
  Executed right after scaling. The Imagick object is passed to them.
  Must be an instance of Pupiq\ImageScaler\AfterScaleFilter.
• After save filters
  Executed right after the image is saved to the output file. The filename is passed to them.
  Must be an instance of Pupiq\ImageScaler\AfterSaveFilter.

In both types the scaling options array is also passed to the filter.

This package comes with several built-in filters.

Grayscale filter

Converts the processed image to grayscale. It is an after scale filter.

$scaler = new Pupiq\ImageScaler("/path/to/image.jpg");
$scaler->appendAfterScaleFilter(new Pupiq\ImageScaler\GrayscaleFilter());

$scaler->scaleTo(300, 300);
$scaler->saveTo("/path/to/output_image.jpg"); // grayscale

Pngquant Optimizer filter

Significantly reduces the file size of PNG images using the pngquant binary. It is an after save filter and has no effect on non-PNG output formats.

$scaler = new Pupiq\ImageScaler("/path/to/image.png");
$scaler->appendAfterSaveFilter(new Pupiq\ImageScaler\PngquantOptimizer([
  "pngquant_binary" => "/usr/bin/pngquant", // default: "pngquant"
  "quality_range" => "70-90"                // default: "70-90"
]));

$scaler->scaleTo(300, 300);
$scaler->saveTo("/path/to/output_image.png");

Watermark filter

Places a watermark image over the processed image. It is an after scale filter.

$scaler = new Pupiq\ImageScaler("/path/to/image.jpg");
$scaler->appendAfterScaleFilter(new Pupiq\ImageScaler\WatermarkFilter("/path/to/watermark_image.png", [
  "opacity" => 50,          // percentage, default: 50
  "position" => "center",   // "center", "left-top", "left-bottom", "right-top", "right-bottom"; default: "center"
]));

$scaler->scaleTo(300, 300);
$scaler->saveTo("/path/to/output_image.jpg"); // watermarked image

Combining filters

Filters can be combined and are applied in the order they were added.

$scaler = new Pupiq\ImageScaler("/path/to/image.jpg");

$scaler->appendAfterScaleFilter(new Pupiq\ImageScaler\WatermarkFilter("/path/to/watermark_image.png"));
$scaler->appendAfterScaleFilter(new Pupiq\ImageScaler\GrayscaleFilter());

$scaler->scaleTo(300, 300);
$scaler->saveTo("/path/to/output_image.jpg"); // watermarked and grayscaled

Installation

Use the Composer:

composer require pupiq/image-scaler

Testing

Install required dependencies:

composer update

Run tests:

cd test
../vendor/bin/run_unit_tests

License

ImageScaler is free software distributed under the terms of the MIT license