public function ajax_convert_image() {
    // ... existing validation code ...

    // New resolution handling
    $resolution = isset($_POST['resolution']) ? sanitize_text_field($_POST['resolution']) : 'medium';
    
    // Process image with resolution-specific settings
    try {
        $image_path = $_FILES['image']['tmp_name'];
        $svg_content = $this->process_image($image_path, $layers, $resolution);

        wp_send_json_success([
            'svg' => $svg_content,
            'layers' => $layers,
            'resolution' => $resolution
        ]);
    } catch (Exception $e) {
        wp_send_json_error([
            'message' => $e->getMessage()
        ]);
    }
}

private function process_image($image_path, $layers, $resolution) {
    // Load and resize image
    $image = $this->load_image($image_path);
    
    // Resolution-specific processing
    $image = $this->resize_for_resolution($image, $resolution);
    
    // Convert to grayscale
    imagefilter($image, IMG_FILTER_GRAYSCALE);
    
    // Generate SVG
    return $this->generate_svg($image, $layers, $resolution);
}

private function resize_for_resolution($image, $resolution) {
    $orig_width = imagesx($image);
    $orig_height = imagesy($image);

    // Resolution-based scaling factors
    $scale_factors = [
        'low' => 0.25,     // 25% of original size
        'medium' => 0.5,   // 50% of original size
        'high' => 0.75,    // 75% of original size
        'ultra' => 1.0     // Full original size
    ];

    $scale = $scale_factors[$resolution] ?? 0.5;

    $new_width = round($orig_width * $scale);
    $new_height = round($orig_height * $scale);

    // Create new image
    $resized = imagecreatetruecolor($new_width, $new_height);
    
    // Enable alpha blending
    imagealphablending($resized, false);
    imagesavealpha($resized, true);

    // Resize
    imagecopyresampled(
        $resized, $image, 
        0, 0, 0, 0, 
        $new_width, $new_height, 
        $orig_width, $orig_height
    );

    return $resized;
}

private function generate_svg($image, $layers, $resolution) {
    $width = imagesx($image);
    $height = imagesy($image);

    // Resolution-based step sizes
    $step_sizes = [
        'low' => 10,     // Larger steps, less detail
        'medium' => 5,   // Balanced
        'high' => 3,     // More detail
        'ultra' => 2     // Maximum detail
    ];

    $step_size = $step_sizes[$resolution] ?? 5;

    $svg = [
        sprintf('<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" viewBox="0 0 %d %d">', 
            $width, $height, $width, $height)
    ];

    for ($y = 0; $y < $height; $y += $step_size) {
        for ($x = 0; $x < $width; $x += $step_size) {
            // Get pixel color
            $rgb = imagecolorat($image, $x, $y);
            $r = ($rgb >> 16) & 0xFF;
            $g = ($rgb >> 8) & 0xFF;
            $b = $rgb & 0xFF;

            // Calculate brightness
            $brightness = ($r + $g + $b) / 3;
            
            // Map brightness to layer
            $layer = floor(($brightness / 255) * $layers);
            $layer = min($layers - 1, max(0, $layer));

            // Calculate depth and color
            $depth = ($layers - $layer) * 2;
            $gray_value = 255 - floor(($layer / $layers) * 200);

            // Create SVG rectangle
            $svg[] = sprintf(
                '<rect x="%d" y="%d" width="%d" height="%d" fill="rgb(%d,%d,%d)" />',
                $x, $y + $depth, 
                $step_size, $step_size, 
                $gray_value, $gray_value, $gray_value
            );
        }
    }

    $svg[] = '</svg>';

    return implode("\n", $svg);
}<br />
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