Texas Instruments MATRIX 3000, DW30 user manual Filter, Detail, Brightness, Gamma

Section 3: Operation

Brightness

(SHORT CUT: Press Bright and adjust the slidebar.)

“Brightness” increases or decreases the amount of black in the image (0-100). For best results, keep close to 50. Start with a high value and decrease so that dark areas do not become black (i.e., are “crushed”). Conversely, high brightness changes black to dark gray, causing washed-out images.

Gamma

(SHORT CUT: Press Gamma and adjust the slidebar.)

“Gamma” is a global setting that determines what gray shades are displayed between minimum input (black) and maximum input (white) for all signals. A good gamma setting helps to optimize blacks and whites while ensuring smooth transitions for the “in-between” values utilized in other colors. Thus, unlike “Brightness” and “Contrast” controls, the overall tone of your images can be lightened or darkened without changing the extremes, and all images will be more vibrant while still showing good detail in dark areas.

Gamma is used to fine tune the gamma table currently in use, ranging from 1 – 3 (2.2

=default). If excess ambient light washes out the image and it becomes difficult or impossible to see details in dark areas, lower the gamma setting to compensate. This will improve contrast while maintaining good details for blacks. Conversely, if the image is washed out and unnatural, with excessive detail in black areas, increase the setting. In high ambient light conditions, lower gamma may produce better results than higher gamma. Gamma of 2.2 (default) indicates the gamma table has not been adjusted. For more information, refer to Advanced Image Settings, Gamma Table submenu. Again, good gamma improves contrast while maintaining good details for blacks.

Filter

The proper filter setting is automatically set for virtually all signals, and rarely needs to be changed. It applies a low pass

filter for noise reduction in the incoming input signal, particularly for HDTV or SDTV. Applied in the analog domain before

sampling, this filtering removes high frequencies and thus

reduces pixel phase noise (note this also reduces signal bandwidth). Override only if standard pixel tracking and phase adjustments do not adequately clear up a “noisy” video signal, or if a graphics signal appears overly “soft”. Both instances indicate that “Filter” may be set to the wrong option.

Detail

“Detail” adjusts the sharpness of a video image so that edges remain clearly defined. It can be particularly useful if a significant “Noise Reduction” adjustment has caused the image to appear too soft. Adjust until the display is as sharp as desired, keeping in mind that because “Detail” adds some high frequencies back into the image, it can also re-introduce a certain degree of noise.

013-100149-02 Rev. 1 (01/07) Christie DS+60/DW30/Matrix 3000 User’s Manual 3-25