"Save as render" option for animation frames or file output node

I am rendering an animation in png images but I miss the turn off “Save as render” option, as by default it creates a countour line arround all the objects very visible when I add the background in anothe software (please find example images attached). There is a way to enforce that option when rendering an animation or something like the file output node? Thanks!

01save_as_render_off 01save_as_render_on