HP DreamColor Z31x User Guide - Page 31
Understanding image adjustment options, Video signal adjustments, Downstream RGB adjust
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3. Select Color settings to display the color space configuration screen. 4. Use the Up/Down buttons to navigate to the Adjust luminance option, and then press the Select button to activate it. 5. Use the Increase/Decrease buttons to adjust the luminance to the desired level. NOTE: The Adjust luminance option displays the current luminance value to the right of the menu option. Understanding image adjustment options Several special image adjustment options are designed to fit specific workflows in the media and entertainment industry. The following section describes these functions from the perspective of their application in these workflows. Video signal adjustments Downstream RGB adjust In some cases it may be necessary post-calibration to tweak the setup (black) or gain (white) of one or more of the RGB channels in order to visually match another display or projector. These adjustments are positioned downstream of (i.e., after) the color management processing block in the display hardware. These adjustments provide 10-bit precision. To adjust setup and gain RGB: 1. Press any Function button on the front bezel. 2. Press the Open Menu button to open the OSD. 3. Select Color settings > Downstream RGB adjust. 4. Use the adjustment settings to adjust Setup and Gain until you achieve the desired color match with the other display device. Use video levels (64-960) This option is designed to support the accurate display of "video legal" signals that include footroom below black and headroom above white. These types of signals are typically encountered when working with video signals that conform to the complete ITU-R BT.709 standard. This standard allows for excursions beyond black and white, rather than treating black and white as absolutes. These signals are typically encountered in the following situations: ● Viewing the HDMI or HD-SDI output from a video capture and playback card such as an AJA Kona or Blackmagic Design DeckLink ● Viewing an image in the Composer/Edit/Preview window in a non-linear video editing program ● Viewing the output of a consumer Blu-Ray/DVD player In all of these situations the video signal usually includes the BT.709 headroom and footroom. Without this option enabled when viewed in a display, the blacks and shadows are lighter, the whites are darker, and colors have less saturation than the signal actually contains. When this option is enabled the blacks will be clipped at the 10-bit value of 64 and the whites at the 10-bit value of 960 (for 8-bit, the clipping will occur at the values of 16 and 235). The signal is then remapped to display the signal in the correct visual range. Understanding image adjustment options 21