Resize an image with height/width constraints and constant ratio - html

Question

I want to insert an image in a webpage and I want it to fit in a 120*40 space.
The problem is, original images can have about any size (400*40, 30*220, etc.)
so if I set height attribute to 40, I might find myself with images larger than 120 width. The same goes if I set a 120px width.
If I set both width to 120 and height to 40, well it fits, but the original ratio is lost, and I don't want that.
What would you suggest ?
Get the original properties of the image in javascript and then set one of them (either to 120 width or 40 height) so that the other fits in 120*40 ?
There are a lot images like that in one page so I think this method is a bit heavy...
PHP solution :
<?php
list($width, $height, $type, $attr) = getimagesize($image);
if($width/$height>3)
$height *= 120/$width;
else
$height = 40;
?>
<img src="<?=$image?>" height=<?=$height?>>
see below for a javascript solution and a CSS solution

Answer 1

css properties max-width and max-height are what you need.
My guess is that it will resize itself if it reaches one of these.
I have used this alot in previous web projects.
But i havent used the combination of both yet.
EDIT: I've sais this in a comment, but setting both those properties does work in my tests. It keeps the ratio and resizes by the limit it reaches first. Do not set any width or height properties, these might cause problems

Answer 2

JavaScript is quite fast, so why not try it?
I'd just stick to finding the aspect ratio and adding some checks:
var width = image.width;
var height = image.height;
var ratio = width / height;
if (width > 120) {
width = 120;
height = 120 * ratio;
} else if (height > 80) {
height = 80;
width = 80 * ratio;
}
image.width = width + 'px';
image.height = height + 'px';
As you seem to be using PHP, ImageMagick can resize an image to fit inside of a predefined box. I only know how to do it via CLI, as I don't use PHP, but I bet the PHP code would be simple.

Answer 3

I was actually searching for an answer to a different query but came across yours.
I use this to resize images which I am finding is very handy in a number of my scripts, but what I would suggest is that you resize the image to a little bigger than the longest side of the container and then use css to center the image both horizontally and vertically and set the container with overflow:hidden;
You lose a small bit of the image around the edges but at least they are all inserted without any stretching or squashing.
Hope that helps you or anyone else trying something similar.