page_title: Blue only mode
section_title: How the Blue Only Mode works
hierarchical_section_title: Blue only mode / How the Blue Only Mode works
caption_attribution_description: English: The Picture shows the usage of a color bar test pattern with a blue filter foil Deutsch: Das Bild zeigt den Einsatz eines Farbbalken Testbilds mit einer Balufilterfolie.
context_page_description: Blue Only mode is a special display mode on display units such as projectors and television sets whereby only the blue pixels or the blue cathode ray tube is used to generate the image.
  Displays featuring this mode are prominent especially in the broadcast area because it allows for hue and saturation to be adjusted quickly and accurately. Professional monitors may feature a dedicated button on the front of the display to activate blue only mode.
context_section_description: In Blue Only mode only the blue pixels of a display render the picture on the screen - or, for CRT displays, the blue cathode ray tube. Thus we see only the blue channel of the image, but rather blue tinted than black and white. Areas with blue color in it appear bright and those without blue color appear dark or black.
  A blue color with RGB values of 0 0 255 therefore appears bright. A red area (255 0 0) or a green surface (0 255 0) appears black.
  Below - or in some test images above - the color bars are reference areas, that serve as an indication for a proper adjustment. Because the reference areas have the same brightness value as the colored bars. If the display is properly adjusted, in the Blue Only Mode the colored areas blend perfectly into the reference areas, without a visible luminance difference.
  In the HD SMPTE test pattern, the reference area is located below the color bar in the form of a gray continuous surface (white with 75% luminance).
  In the old NTSC SMPTE test pattern, the reference area is also located under each color bar, but colored differently.
  The Blue Only-test image of the company Burosch has reference areas above and below the color bars.
  The following table shows the different colors in the test pattern, the corresponding code values and the visual impression with activates Blue Only Mode:
caption: Blue filter foil in use with a color bar
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