is there any image effect to add white background in the image in drupal 7

Question

Drupal 7 module 'image style' can make image effect such as resize,scale,crop etc.But it's not enough. For example, the original image size is 800x600, I can scale it to 400x300, then I want to add white background in height, make it 400x400. How to make this effect?

Answer 1

image cache actions is a great module for such cases... you can try that