Image transform that only crops if image is larger than set dimensions At the moment I have an image 300px wide, my transform is set to a width of 600px so it upscales it. 

I would like it to only transform if the image is over 600px. 

Is this possible or should I use some other image manipulation thing like phpthumb?
You can easily do this in twig with a conditional that checks if the width of the image is larger than your target transforms width. Try something like this:

{% if image.getWidth()&gt;600 %}
  &lt;img src="{{ image.getUrl({ width: 600 }) }}"&gt;
{% else %}
  &lt;img src="{{ image.getUrl() }}"&gt;
{% endif %}