image_proc.txt

use sips cli tool

resiliant images/luba-ertel-WlL8aHeMcVM-unsplash.jpg
1280 59%
980 92%
736 93%
480 92%

lib images/library.png
1280 90%
980 92%
736 93%
480 92%

rest are full width

   @include breakpoints((
       xlarge:   ( 1281px,  null ),
       large:    ( 981px,   1280px ),
       medium:   ( 737px,   980px  ),
       small:    ( 481px,   736px  ),
       xsmall:   ( null,    480px  ),
   ));