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Setting Driver Properties
The Video Proc Amp tab has the following controls.
Brightness and | These are terms for what one would call a contrast ratio. It’s a measure of a display |
Contrast | system, defined as the ratio of the brightest color (white) to that of the darkest color |
| (black) that the system is capable of producing. A high contrast ratio is a desired |
| aspect of any display, but with the various methods of measurement for a system or |
| its part, different measured values can sometimes produce similar results. The control |
| exists in the event you need to change the ratio of an incoming signal. |
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Hue | Hue adjustment only functions for NTSC video. It sets the predominance of color, |
| classed as red, yellow, green, blue or an intermediate color based on a contiguous |
| pair of these colors |
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Saturation | In color theory, saturation or purity refers to the intensity of a specific hue. A highly |
| saturated hue has a vivid, intense color, while a less saturated hue appears more |
| muted and grey. With no saturation at all, the hue becomes a shade of grey. You are |
| able to adjust the saturation level in the event it is altered by a video feed. |
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Sharpness | This slider has eight positions corresponding to eight hardware filter settings. |
| Generally, the positions to the left result in smoother video, the positions to the right |
| result in sharper video. Since each step engages a different combination of discrete |
| filters, some steps may result in slight differences while other steps may result in |
| large differences. The range is 0 to 7. |
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Gamma | You would rarely use this control; however, a need may arise for its use. In the |
| simplest terms the input of a feed from a device into your card may not match the |
| digital output on your screen. The gamma control allows you to balance the red, blue |
| and green from the input to output within the normal range of people’s perceptions. |
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White Balance | This field is an unused DirectShow feature and is not selectable. |
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Backlight Comp | This field is an unused DirectShow feature and is not selectable. |
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Gain | This field is an unused DirectShow feature and is not selectable. |
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Color Enable | This field is an unused DirectShow feature and is not selectable. |
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PowerLine | This field is an unused DirectShow feature and is not selectable. |
Frequency |
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(Anti Flicker) |
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Default | Click Default to return to the default settings. |
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Auto | This field is an unused DirectShow feature and is not selectable. |
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OK | Click OK to accept the settings. |
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Cancel | Click Cancel to close the window. |
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Apply | Click Apply to apply the settings. |
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Help | Click Help to access the user guide. |
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For all of the Video Proc Amp controls the driver maintains one setting per Osprey device. It does not maintain individual settings for each input or type of input.
When you change the video standard or input you will not see changes in the slider controls – such as the Hue button becoming disabled – until the driver properties dialog is closed and
20 | ViewCast |