Grey card for controlling exposure and white balance of a digital camera
AssigneeLastolite Limited
InventorSean Henry
Life of this patent
Estimating the term…
Abstract
A target (10, 20) is disclosed suitable for setting the exposure and white balance of a photographic digital camera. The target (10, 20) comprises a target surface (12) that has a reflectance of 18% for all wavelengths of visible light. The target surface (12) is provided with a feature (16) upon which the camera is able to focus.
Claims21
A target for setting the exposure and white balance of a photographic digital camera, the target comprising a target surface that has a reflectance of 18% for all wavelengths of visible light, and the target surface being provided with a target feature upon which the camera is able to focus while the target surface entirely fills a viewfinder of the camera.
A method of photographing a subject, which method comprises the steps of:
- (a) positioning a target close to the subject, the target comprising a target surface that has a reflectance of 18% for all wavelengths of visible light, and the target surface being provided with a target feature upon which the camera is able to focus;
- (b) causing the camera to focus on the target feature of the target surface, and simultaneously setting the exposure and white balance of the camera;
- (c) removing the target from the field-of-view of the camera whilst maintaining the focus, exposure, and white balance settings of the camera;
- and
- (d) taking a photograph of the subject using said focus, exposure, and white balance settings of the camera.
Dependencies are inferred from the claim text.