The following images are needed for the Roku app:
Logo HD (all content)
– 240px x 54px, PNG file only
Channel Poster FHD
– 540px x 405px, PNG file only
Channel Poster HD
– 336px x 210px, PNG file only
Channel Poster SD
– 246px x 140px, PNG file only
Splash Screen FHD
– 1920px x 1080px, PNG file only
Splash Screen HD
– 1280px x 720px, PNG file only
Splash Screen SD
– 720px x 480px, PNG file only
Homescreen Background (all content)
– 1920px x 1080px, PNG file only
After you created all the required images you can add them on the Roku app branding page in admin area.