A:Answer Hi RSB,
Thanks for your question! To further adjust your 55" Class 4- Series 4K UHD Smart Fire TV you can click settings, followed by picture, and continue to make adjustments as needed. The 4- Series supports 4K Ultra HD, HDR 10, and HLG to deliver a clearer and more vibrant picture with brighter colors compared to 1080p Full HD. Hope this helps! Have a great Day!