The following post is the reverse of what you are looking for, but potentially there are settings in some of the suggested add-ons that might help Images taking a lot of space
If you want to find and upsize your images you can try this script (untested - use on a copy of your site first). Update your path where indicated
Place this script in a file e.g. grow_my_image.php
<?php
// path to your images directory
$dir = new RecursiveDirectoryIterator('/path/to/your/images/');
// iterate over each file in the directory and its subdirectories
foreach (new RecursiveIteratorIterator($dir) as $filename => $file) {
// only process jpg, png, and gif images
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if (!in_array($ext, array('jpg', 'png', 'gif'))) {
continue;
}
// get the image dimensions
list($width, $height) = getimagesize($filename);
// check if the height is less than 100
if ($height < 100) {
// load the image
$image = imagecreatefromjpeg($filename);
// calculate the new height
$new_height = 100;
// calculate the new width to maintain the aspect ratio
$new_width = ($width / $height) * $new_height;
// create a new image with the new dimensions
$new_image = imagecreatetruecolor($new_width, $new_height);
// copy and resize the old image into the new image
imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
// save the new image over the old one
imagejpeg($new_image, $filename);
// free up memory
imagedestroy($image);
imagedestroy($new_image);
}
}
?>
This is a simplified script and it may not cover all your needs, such as error checking and handling different image formats. You should also be careful with resizing images as it can degrade image quality, especially when upscaling if you have any icon or button images in particular this could be a issue, you could maybe alter script to exclude images under 30x30 on the assumption that these are that type of image.