VIOFO A119S Dashcam WDR Comparison. I was never impressed with VIOFO's Wide Dynamic Range feature until testing the A119S new Firmware v2.1 > the WDR image improvements are amazing compared to all previous firmware releases. The enhancements are only noticeable on scenes with both dark and bright areas. WDR does alter colours and overly brighten dark scenes which is great for recording accident evidence. Wide Dynamic Range colour contrast adjustment combines multiple images at different brightness levels to brighten dark scenes or darken light scenes. WDR enhances night scenes when both very dark and very bright areas occur at the same time.