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Exposure Control Options |
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Exposure Control Options |
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| • | Active – Turns the exposure control on and off. |
| • | Process Background and Environment Maps – Not applicable |
| • | Render Preview – Not needed in Shaderlight as changes to the exposure are updated interactively |
| • | Exposure Value – The Exposure Value is a simple way of expressing the overall illumination of the scene. In a physical camera an internal light meter measures the illumination coming into the camera and adjusts the shutter speed or aperture to set the exposure correctly for the image. |
Adjusting the EV up and down alters the exposure, making the image darker or lighter. Each increment of 1 EV corresponds to halving the effective exposure resulting in a darker image. Decreasing the EV by 1 doubles the effective exposure resulting in a brighter image.
| • | Photographic Settings – Lets you set the exposure using standard camera-oriented controls: |
| • | Shutter Speed – On a camera, the length of time the shutter is open controls the amount of light that comes into the camera and hence the exposure (longer is brighter). The Shutter Speed value in Shaderlight is set as the fraction of a second (a value of 10 means one tenth of a second, a value of 100 means one hundredth of a second and so on). Larger values therefore mean shorter durations and therefore darker images. |
| • | Aperture – Controls the size of the opening of the camera iris and is expressed as a ratio between the diameter of the opening and the focal length of the lens. The higher this value, the smaller the aperture and therefore the darker the image. |
| • | Film Speed (ISO) – In traditional photography the sensitivity of the camera film is expressed as an ISO value. The larger the number, the more sensitive the film and it requires less light to expose the image. So in Shaderlight a larger ISO value results in a brighter image. |
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