The IXUS 255 HS supports a maximum video resolution of 1920 x 1080 pixels. That's over six times the video resolution of a 640 x 480 pixels digital camera, which is the most common video resolution supported by compact camera digital cameras that have been available for around the same time as the IXUS 255 HS. 640 x 480 pixels is also supported by this digital camera. In addition, this camera support a video resolution of 320 x 240 pixels and 1280 x 720 pixels. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
A 1920 x 1080 pixels video resolution is actually the best supported video resolution amongst all digital cameras of this type and age.
A 320 x 240 pixels video resolution is the worst supported video resolution across comparable types of digital camera.