Problem: If I have proportional size... background of image is transparent. If I select size Pad, background of image is black i need to put white color in color padding. Why is it happen this?
Solution: When you choose "pad", then background is "added" to adjust the image size. When you choose "proportional", the background is not modified.
Relevant Documentation:
https://toolset.com/documentation/customizing-sites-using-php/functions/#image
