PAL Colour Bar Test Pattern
(with a "Bucket of Blood")
![PAL Colour Bars](/images/iresource/itech/bars03.gif)
Colour Bars are used to callibrate video and television monitors. The example above is a common type of PAL colour bar test pattern. The red bar at the bottom is often referred to as a bucket of blood and may contain some text identifying the source.
Colour Bars are usually generated by specialised video calibration equipment such as a synch pulse generator, or by a video camera.
NTSC Colour Bars, Including Grayscale and Pluge Pattern.
![NTSC Bars](/images/iresource/itech/bars01.gif)