When a video hosted by GoAnimate is viewed, it is being rendered in real time using the viewer's browser and Flash plug-in. This process streams raw data from our servers to the viewer's computer without loss of data. This is known as "lossless playback."
When a video is converted to MP4 for downloading, a "lossy" process is used based on the MP4's internal h.264 coding technique. This results in very subtle differences in color that can be noticed on high-end computer monitors. This is normal and expected behavior.