Failed to download image.

"); // Save temp file $tempFile = tempnam(sys_get_temp_dir(), 'img_'); file_put_contents($tempFile, $imageData); // Detect image type $imageInfo = getimagesize($tempFile); if ($imageInfo === false) die("

Failed to detect image type.

"); switch ($imageInfo[2]) { case IMAGETYPE_JPEG: $image = imagecreatefromjpeg($tempFile); break; case IMAGETYPE_PNG: $image = imagecreatefrompng($tempFile); break; case IMAGETYPE_GIF: $image = imagecreatefromgif($tempFile); break; default: die("

Unsupported image type.

"); } // Original dimensions $width = imagesx($image); $height = imagesy($image); // Upscale 400% using bicubic smoother $scale = 4; $newWidth = $width * $scale; $newHeight = $height * $scale; if (function_exists('imagescale')) { $upscaled = imagescale($image, $newWidth, $newHeight, IMG_BICUBIC_FIXED); } else { $upscaled = imagecreatetruecolor($newWidth, $newHeight); imagecopyresampled($upscaled, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); } imagedestroy($image); // Enable alpha blending imagesavealpha($upscaled, true); imagealphablending($upscaled, false); $transparent = imagecolorallocatealpha($upscaled, 0, 0, 0, 127); // Convert black/gray to fully transparent (< 200 brightness) and invert visible pixels for ($x = 0; $x < $newWidth; $x++) { for ($y = 0; $y < $newHeight; $y++) { $rgb = imagecolorat($upscaled, $x, $y); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; $b = $rgb & 0xFF; $brightness = ($r + $g + $b) / 3; if ($brightness < 200) { // Make dark pixels transparent imagesetpixel($upscaled, $x, $y, $transparent); } else { // Invert light pixels $ir = 255 - $r; $ig = 255 - $g; $ib = 255 - $b; $color = imagecolorallocatealpha($upscaled, $ir, $ig, $ib, 0); imagesetpixel($upscaled, $x, $y, $color); } } } // Encode PNG for inline display ob_start(); imagepng($upscaled); $processedBase64 = base64_encode(ob_get_clean()); imagedestroy($upscaled); // Clean up temp file @unlink($tempFile); ?>

Processed Counter PNG