Does anyone know the calculation to use for keeping image sizes?

Let's say I wanted to give an image a width of 300pixels, but keep the proportionate height.

I've looked at sample scripts but they all go into way too much detail, and I can't really be bothered sifting through all of the code just to see where the calculation comes in!

Hello, basically you need to get the maximum height since you already have the maximum width, to do this try the code below.

PHP Code:


<?php

//Get image information
$image_info = getimagesize("path_to_image");

//Get original width and height of the image
list($width,$height,,,,,,) = $image_info;

// Specify the maximum width of the image
$maxwidth = "300";

/* Get the percentage so we will know what to multiply to $height to get the maximum height*/
$percentage = $maxwidth / $width;

// Get the maximum height
$maxheight = $height * $percentage;

 ?>

thanks!