How to make phpthumb not stretch the image?

Question

PHP

For example, the original image is 60x60 pixels. We generate previews 120x120. It is necessary that this image be the original size (without enlargement) in the center and a white background is added around.
Right now I'm using the following settings:

[{"w":120,"h":120,"q":90,"zc":"0","aoe":"0","bg":"ffffff"}]

Original:
What you get:
What you need to get:

Answer 1

the zoom-crop parameter must be equal to 1, in your case zc":"1"