Image Generation

Generate stunning images from text prompts using AI-powered models. Prism provides a clean, consistent API for image generation across different providers, starting with comprehensive OpenAI support.

Getting Started

Creating images with Prism is as simple as describing what you want:

use Prism\Prism\Prism;

$response = Prism::image()
    ->using('openai', 'dall-e-3')
    ->withPrompt('A cute baby sea otter floating on its back in calm blue water')
    ->generate();

$image = $response->firstImage();
echo $image->url; // https://oaidalleapiprodscus.blob.core.windows.net/...

Provider Support

Currently, Prism supports image generation through:

• OpenAI: DALL-E 2, DALL-E 3, and GPT-Image-1 models
• Gemini: Gemini 2.0 Flash Preview Image Generation, Imagen 4, Imagen 3

Additional providers will be added in future releases as the ecosystem evolves.

Basic Usage

Simple Generation

The most straightforward way to generate an image:

$response = Prism::image()
    ->using('openai', 'dall-e-3')
    ->withPrompt('A serene mountain landscape at sunset')
    ->generate();

// Access the generated image
$image = $response->firstImage();
if ($image->hasUrl()) {
    echo "Image URL: " . $image->url;
}
if ($image->hasBase64()) {
    echo "Base64 Image Data: " . $image->base64;
}

Working with Responses

The response object provides helpful methods for accessing generated content:

$response = Prism::image()
    ->using('openai', 'dall-e-2')
    ->withPrompt('Abstract geometric patterns in vibrant colors')
    ->generate();

// Check if images were generated
if ($response->hasImages()) {
    echo "Generated {$response->imageCount()} image(s)";

    // Access all images
    foreach ($response->images as $image) {
        if ($image->hasUrl()) {
            echo "Image: {$image->url}\n";
        }

        if ($image->hasBase64()) {
            echo "Base64 Image: " . substr($image->base64, 0, 50) . "...\n";
        }

        if ($image->hasRevisedPrompt()) {
            echo "Revised prompt: {$image->revisedPrompt}\n";
        }
    }

    // Or just get the first one
    $firstImage = $response->firstImage();
}

// Check usage information
echo "Prompt tokens: {$response->usage->promptTokens}";
echo "Model used: {$response->meta->model}";

Provider-Specific Options

While Prism provides a consistent API, you can access provider-specific features using the withProviderOptions() method.

OpenAI Options

OpenAI offers various customization options depending on the model:

DALL-E 3 Options

$response = Prism::image()
    ->using('openai', 'dall-e-3')
    ->withPrompt('A beautiful sunset over mountains')
    ->withProviderOptions([
        'size' => '1792x1024',          // 1024x1024, 1024x1792, 1792x1024
        'quality' => 'hd',              // standard, hd
        'style' => 'vivid',             // vivid, natural
        'response_format' => 'url',     // url, b64_json
    ])
    ->generate();

GPT-Image-1 (Base64 Only)

The GPT-Image-1 model always returns base64-encoded images, regardless of the response_format setting:

$response = Prism::image()
    ->using('openai', 'gpt-image-1')
    ->withPrompt('A cute baby sea otter floating on its back')
    ->withProviderOptions([
        'size' => '1024x1024',              // 1024x1024, 1536x1024, 1024x1536, auto
        'quality' => 'high',                // auto, high, medium, low
        'background' => 'transparent',      // transparent, opaque, auto
        'output_format' => 'png',           // png, jpeg, webp
        'output_compression' => 90,         // 0-100 (for jpeg/webp)
    ])
    ->generate();

$image = $response->firstImage();
if ($image->hasBase64()) {
    // Save the base64 image to a file
    file_put_contents('generated-image.png', base64_decode($image->base64));
    echo "Base64 image saved to generated-image.png";
}

Base64 vs URL Responses

Different models return images in different formats:

• GPT-Image-1: Always returns base64-encoded images in the base64 property
• DALL-E 2 & 3: Return URLs by default, but can return base64 when response_format is set to 'b64_json'

// Request base64 format from DALL-E 3
$response = Prism::image()
    ->using('openai', 'dall-e-3')
    ->withPrompt('Abstract art')
    ->withProviderOptions([
        'response_format' => 'b64_json',
    ])
    ->generate();

$image = $response->firstImage();
if ($image->hasBase64()) {
    echo "Received base64 image data";
}

Gemini Options

Gemini offers customizations, depending on what model is selected. All Gemini image generation models return base64-encoded images only. They also return mimeType.

Gemini Flash Preview Image Generation

Gemini conversational image generation provides the option to edit images:

$originalImage = fopen('image/boots.png', 'r');

$response = Prism::image()
    ->using(Provider::Gemini, 'gemini-2.0-flash-preview-image-generation')
    ->withPrompt('Actually, could we make those boots red?')
    ->withProviderOptions([
        'image' => $originalImage,
        'image_mime_type' => 'image/png',
    ])
    ->generate();

Imagen Options

$response = Prism::image()
    ->using(Provider::Gemini, 'imagen-4.0-generate-001')
    ->withPrompt('Generate an image of a magnificent building falling into the ocean')
    ->withProviderOptions([
        'n' => 3,                               // number of images to generate
        'size' => '2K',                         // 1K (default), 2K
        'aspect_ratio' => '16:9',               // 1:1 (default), 3:4, 4:3, 9:16, 16:9
        'person_generation' => 'dont_allow',    // dont_allow, allow_adult, allow_all
    ])
    ->generate();

Testing

Prism provides convenient fakes for testing image generation:

use Prism\Prism\Prism;
use Prism\Prism\Testing\PrismFake;

test('can generate images', function () {
    $fake = PrismFake::create()->image();
    Prism::fake($fake);

    $response = Prism::image()
        ->using('openai', 'dall-e-3')
        ->withPrompt('Test image')
        ->generate();

    expect($response->hasImages())->toBeTrue();
    expect($response->firstImage()->url)->toContain('fake-image-url');
});

Need help with a specific provider or use case? Check the openai documentation or gemini documentation for detailed configuration options and examples.