VIDEO PROCESSOR GAMMA CONTROL HOW TO
VIDEO PROCESSOR GAMMA CONTROL PATCH
VIDEO PROCESSOR GAMMA CONTROL TV

VIDEO PROCESSOR GAMMA CONTROL TV

You must be using the best user menu settings in the projector to avoid posterization.įinally, I have never seen a situation where a projector and TV using completely different display technologies have similar (poor) gamma measurements. if you are clipping on the white end of the spectrum, posterization is much more likely. that kind of pattern allows you to see if you are clipping. you must make sure you are not clipping steps below 235 using an appropriate test pattern (I prefer a pattern with digital steps from 220-255. Next, the settings you pick in the projector could be causing the problem to happen much sooner than it should happen. You could also get a better video processor that can handle large setting moves without creating the posterization problem. that way, neither device is pushing the adjustment envelope too much. When posterization is an issue, the best thing to do is to fix some of the problem using the settings in the projector and fix the remainder of the problem with the video processor. On the other hand, Samsung is the only brand I know of that has an 18-bit internal data path and I've never seen posterization develop on a Samsung TV even with fairly large calibration settings. and that would be OK if those bits were all used effectively, but I've worked on some Toshiba models (for example) where adjusting a control more than +/-3 out of a +/- 15 setting range causes posterization. There are surprisingly large numbers of video displays that have 10-bit video paths. Very large setting changes stress the digital video processing path, though the more headroom there is in the video data path, the less likely this is to happen. This can happen when the video processor settings are too severe or when the projector settings are too severe. something in the image path is causing a loss of bits in the images. Posterization indicates that you are not getting 8-bits of resolution. Setting gamma to 2.3 to 2.4 makes everything in the midtones (35%-75%) too dark. Hence, gamma value of 2.2 has become the golden standard of digital display for a proper calibration.I think the original poster meant the images were posterized when he used a video processor to try to improve gamma.įirst, Gamma should be 2.2-2.3 because that what is used in studios that create the masters for Blu-ray discs. The exponent of 0.43 is approximately 2.33, quite close to gamma 2.2.

This phenomenon was also found in Ebner and Fairchild’s study in 1998, where they found using an exponent of 0.43 to convert linear intensity into lightness for neutrals can provide an optimal perceptual encoding of grays.

VIDEO PROCESSOR GAMMA CONTROL PATCH

Looking at the overall grays in visual encoding row, the perceived differences between each gray patch are almost identical. And from 0.9 to 1.0 in linear intensity, the difference is subtle, whereas it is more obvious in visual encoding. Note that between 0.0 and 0.1, there is a big visual gap in linear intensity, with a smaller visual gap between 0.0 and 0.1 in visual encoding. The top row, visual encoding, represents the increased intensity from black to white in a low power fashion. The bottom row represents the intensity increasing from black to white in a linear fashion. Impact on luminance impacts the visual system, but the effects are not identical. There is a power law relationship between the output luminance and the input voltage or digital value. You may have heard that gamma 2.2 is standard and wondered why.

VIDEO PROCESSOR GAMMA CONTROL HOW TO

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Video processor gamma control