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By my read of the Oppo 93 manual it has two video processing chips and HDMI output 1 always gets the better one so that's the port with the best image and the most features for adjustments, whereas HDMI 2 has less control :
"6. Sharpness: To set the sharpness of video output. Sharpness (also called Detail/Edge
Enhancement in previous OPPO players) is a video processing function that can control the
image sharpness but at the same time may cause unwanted artifacts.
For HDMI 1, the sharpness level can be set between -16 and +16. The default is level 0, which
turns off sharpness enhancement. The negative levels may be used to reduce or eliminate
overly sharpened video. However, the picture may appear soft. The positive levels increase
At level 1, the player applies low level Detail Enhancement, during which the video
processor isolates the detailed parts from the original image, processes them separately
and integrates back before the final output.
At level 2, the player increases Detail Enhancement to a higher level. Generally, to make
an image “sharper”, we recommend using level 1 and 2.
At level 3 and above, the player adds Luminance Transition Improvement (LTI) and
Chroma Transition Improvement (CTI), which further sharpen the luminance transition and
chroma transition. However, we do not recommend using level 3 and above unless the
source content is poorly produced and blurry.
For HDMI 2 & Analog, the sharpness level can be set between 0 and +2. The default is level
0. The higher the level, the sharper the video details are. However, too high a sharpness level
may cause while line etching around objects."
My casual examination just showed these sharpness adjustments are not enabled while the movie is actually playing so setting them on the fly is not possible. Correct?