NVIDIA updates the Shield Tablet to fix color issue
After the last update sent to the NVIDIA Shield Tablet, which brought version 2.2 to the device last week, there were some complaints that some colors, especially reds, were muted. The update was supposed to bring new games and improved standby battery life to the device along with several performance enhancements.
NVIDIA quickly put together a fix which was sent out on Thursday to Shield owners. The changelog is brief, but covers the color issue and another problem users were having with Netflix. The complete list reads "Display color-space correction, Improvements to Netflix experience."
The update could very well have already hit your tablet. You should find it waiting for you in the Shield Tablet's setings. Download and install it and you should notice brighter colors immediately.
source: NVIDIA via AndroidCentral