Tips from DVI to HDMI

Tips from DVI to HDMI

1. As far as AV is concerned, the current DVD and high-definition programs are all MPEG color-difference signals, while DVI is a RGB signal based on computer video transmission. HDMI is based on DVI as the home AV audio-visual, which can be transmitted. Color difference and RGB video are very important.

2. The following will regard the adjustment of black level, gray scale and gamma as the same thing.

3. The gray scale of color difference (full black to full white) is 16-235, the so-called limited range (some called standard or normal), the gray scale of RGB is 0-255, the so-called full range, some are called enhanced, However, it can also support a limited range of 16-235, which will cause black level problems during DVI-HDMI conversion.

4. The most common problem with digital transmission of video is the black level. If HDMI is connected to HDMI or DVI to DVI, there is generally no problem, but DVI to HDMI or HDMI to DVI is prone to chromatic aberration, RGB conversion and grayscale. The problem of adjustment.

5. The color difference signal usually processed by HDMI is limited range, and the RGB signal of DVI terminal is full range. In order to ensure the interchangeability of the two, HDMI can also receive RGB output and input. The good situation is that the display is DVI, then the HDMI player output is full range RGB, if it is a DVI player, the HDMI display will receive the full range RGB, so there is no problem, the problem is that some DVD PLAYER may Only output limited range RGB, or display HDMI automatically discriminates chromatic aberration or RGB when using limited range or full range, or there is a fixed limited range, which will cause black level problems, black distortion, white Scattered.

6. Four connection methods of gray expression:

type1: limited out-limited in, no problem;
type2: limited out-full in, full white is not easy to recognize, black is white, the brightness of the display should be reduced;
type3: full out-full in, no problem;
type4: full out-limited entry, white flying, black distortion, you need to adjust to the previous 1-3 type.

7. Practical examples

DVI (DENON DVD-A1XN)-DVI (SHARP XV-X11000)

Because it is DVI, as long as the output is set to full range, there is no problem. If the output is limited range, it is necessary to darken the black. The RGB of DENON DVD-A1XN is normal and enhacned.

DVI (DENON DVD-A1XN)-HDMI (SANYO Z3)

It is the most common practice for DVI output to be full range, and z3 has L1 (limited range) and L2 (full range) options.

HDMI-DVI (SHARP XV-Z11000)

The SHARP projector needs to select RGB full range in VIDEO RGB, and HDMI input has a different setting for another machine. For example, PIONEER DV-S969AVi, HDMI COLOR setting when connected to DVI enhanced: RGB full, standard: RGB limited. Panasonic S97, set standard or enhanced in HDMI RGB, Toshiba RD-Z1, connect DVI and output RGB full automatically.

HDMI-HDMI (SANYO Z3)

HDMI to HDMI is basically based on color difference signals, so they are limited range. If the output is set to RGB, you need to pay attention to whether the correspondence of the display equipment can be automatically matched or manual.

E.g

Pioneer DV-S869AVi, when connected to HDMI, HDMI COLOR standard is color difference limited, Enhanced is RGB full; Panasonic DVD-S97, when connected to HDMI, there are three modes: color difference limited, RGB limited, RGB full. HM-DHX2, when connected to HDMI, Auto is color difference limited, RGB fixed is RGB limited.

in conclusion

1. HDMI-HDMI uses color difference, no problem;
2. When RGB is connected, if it is automatically adjusted, it is also possible;
3. If manual setting is used, of course, I hope it is limited-limited, full-full;
4. limited——black and white when full, can be adjusted by the brightness of the display;
5. Full-When limited, the black distortion can not be corresponded, it should be adjusted to the previous 1-3 items.
6. Some monitors have HDMI and DVI input at the same time, and it is not necessarily HDMI-HDMI is better than HDMI-DVI.
7. The influence of the wire rod is great. Some low-cost thin wire rods directly affect the image quality.

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