My client is uploading images via CK Editor into a textarea. The image type is a transparent PNG like the one attached (head-three.png)
However when Processwire resizes this image there are little black line all through.
See the 'head' image on this page - http://thinkingtosuccess.co.uk/business/#tab2
The original image is attached.
How can we avoid these black lines causing the image corruption?