In what scenarios would it be advisable to save scaled images as PNG files rather than in their original format?

When saving scaled images, it may be advisable to save them as PNG files rather than in their original format if the images contain transparency or if the images are line art or logos with sharp edges. PNG files support transparency and lossless compression, making them ideal for preserving the quality of these types of images during scaling. 

// Example code snippet to save a scaled image as a PNG file
$originalImage = imagecreatefromjpeg('original.jpg');
$width = imagesx($originalImage);
$height = imagesy($originalImage);
$newWidth = 200; // Set desired width for scaled image
$newHeight = ($height / $width) * $newWidth;
$scaledImage = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($scaledImage, $originalImage, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
imagepng($scaledImage, 'scaled.png');
imagedestroy($originalImage);
imagedestroy($scaledImage);

Keywords

image scaling PNG files image formats compression PHP functions

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