I am having the same problem. I need to be able to change the compression amount on my jpg files.
on line 207 my code is already set too $process = $image_save_func($image_c, $save_path);
Do I need to change this?
My images look way to compressed, I am sure that in older versions of this plugin you could set the amount, but I may be wrong.
I am using the latest version to date.