PHP code example of phpmlkit / opal

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

phpmlkit / opal example snippets

use PhpMlKit\Opal\Image;
use PhpMlKit\Opal\Color;
use PhpMlKit\Opal\ColorSpace;
use PhpMlKit\Opal\Kernel;

// Load an image
$image = Image::fromFile('path/to/image.jpg');

// Resize with high-quality kernel
$resized = $image->resize(800, 600, Kernel::Lanczos3);

// Convert to grayscale
$grayscale = $resized->toGrayscale();

// Save the result
$grayscale->toFile('output.jpg');

// This doesn't process anything yet
$pipeline = $image
    ->resize(800, 600)
    ->toGrayscale()
    ->brightness(1.2);

// This triggers the actual processing
$pipeline->toFile('output.jpg');

$original = Image::fromFile('input.jpg');
$modified = $original->resize(800, 600);

// $original is unchanged
$original->toFile('original.jpg');
$modified->toFile('resized.jpg');

use PhpMlKit\Opal\Image;
use PhpMlKit\Opal\Color;
use PhpMlKit\Opal\ColorSpace;
use PhpMlKit\Opal\Kernel;
use PhpMlKit\Opal\FlipDirection;

// Load image
$image = Image::fromFile('photo.jpg');

// Resize
$resized = $image->resize(1920, 1080);
$scaled = $image->scale(0.5);

// Thumbnail via shrink-on-load — faster than load+resize
$thumbnail = Image::thumbnail('photo.jpg', 300);

// Crop
$cropped = $image->crop(100, 100, 800, 600);
$centerCropped = $image->centerCrop(800, 600);

// Flip and rotate
$flipped = $image->flip(FlipDirection::Horizontal);
$rotated = $image->rotate(45);
$rotated90 = $image->rot90();

// Save
$resized->toFile('resized.jpg');

use PhpMlKit\Opal\Image;
use PhpMlKit\Opal\ColorSpace;

$image = Image::fromFile('photo.jpg');

// Convert to grayscale
$grayscale = $image->toGrayscale();

// Convert to RGB
$rgb = $grayscale->toRGB();

// Add alpha channel
$rgba = $image->toRGBA();

// Remove alpha
$rgb = $rgba->removeAlpha();

use PhpMlKit\Opal\Image;

$image = Image::fromFile('photo.jpg');

// Brightness (1.0 = unchanged, >1 = brighter, <1 = darker)
$brighter = $image->brightness(1.2);

// Contrast (1.0 = unchanged, >1 = more contrast, <1 = less contrast)
$highContrast = $image->contrast(1.5);

// Saturation (0 = grayscale, 1.0 = unchanged, >1 = more saturated)
$vivid = $image->saturation(1.3);

// Hue rotation
$hueShifted = $image->hue(90);

// Gamma correction
$gammaCorrected = $image->gamma(2.2);

use PhpMlKit\Opal\Image;

$image = Image::fromFile('photo.jpg');

// Sharpen
$sharpened = $image->sharpen(sigma: 2.0);

// Blur
$blurred = $image->blur(sigma: 3.0);

// Median blur (good for noise reduction)
$denoised = $image->medianBlur(5);

// Invert colors
$inverted = $image->invert();

use PhpMlKit\Opal\Image;
use PhpMlKit\Opal\Color;
use PhpMlKit\Opal\BoundingBox;

$image = Image::fromFile('photo.jpg');

// Draw rectangle
$withRect = $image->drawRect(
    100, 100, 200, 150,
    Color::red()
);

// Draw circle
$withCircle = $image->drawCircle(
    400, 300, 50,
    Color::blue(),
    fill: true
);

// Draw text
$withText = $image->drawText(
    'Hello World',
    100, 100,
    color: Color::white()
);

// Composite images
$overlay = Image::fromFile('overlay.png');
$composited = $image->composite($overlay, 50, 50);

use PhpMlKit\Opal\Image;
use PhpMlKit\NDArray\NDArray;
use PhpMlKit\Opal\ColorSpace;
use PhpMlKit\Opal\ChannelFormat;

// Convert image to NDArray
$image = Image::fromFile('photo.jpg');
$array = $image->toArray(ChannelFormat::HWC);  // [H, W, C]

// Convert NDArray to image
$array = NDArray::zeros([224, 224, 3]);
$image = Image::fromArray($array, ColorSpace::RGB, ChannelFormat::HWC);

use PhpMlKit\Opal\Image;
use PhpMlKit\Opal\LoadOptions;
use PhpMlKit\Opal\SaveOptions;

// Load with options
$image = Image::fromFile('photo.jpg', LoadOptions::default()
    ->withAutoRotate(true)
    ->withShrink(2)
);

// Save with options
$image->toFile('output.jpg', SaveOptions::jpeg(
    quality: 90,
    strip: true,
    progressive: true
));

// PNG with compression
$image->toFile('output.png', SaveOptions::png(
    compression: 9,
    interlace: true
));

// WebP with lossless
$image->toFile('output.webp', SaveOptions::webp(
    quality: 80,
    lossless: false
));

$red = Color::rgb(255, 0, 0);
$blue = Color::fromHex('#0000ff');
$white = Color::white();
$transparent = Color::transparent();

$size = new ImageSize(1920, 1080);
$aspectRatio = $size->aspectRatio();
$pixels = $size->pixels();

$box = new BoundingBox(10, 10, 100, 50);
$iou = $box->iou($otherBox);
$clamped = $box->clamp($imageWidth, $imageHeight);

$options = LoadOptions::default()
    ->withPage(0)
    ->withAutoRotate(true)
    ->withShrink(2);

$options = SaveOptions::jpeg(quality: 90, strip: true);
$options = SaveOptions::png(compression: 9);
$options = SaveOptions::webp(quality: 80, lossless: false);