| 摘要 |
The invention relates to a grey card for adjusting the exposure and the white balance of photographic shots, either in the camera when taking the photograph, or during subsequent editing of the photograph in a computer program, which includes a supporting sheet including a surface having a neutral grey colour that reflects 18% of the visible light received thereby, the supporting sheet consisting of ceramic or metal material, and a enamelled surface consisting of a first ground-coat enamel layer arranged on the supporting sheet and a second ceramic covering enamel layer arranged on the first ground-coat enamel layer, maintaining the chromatic characteristics of the grey colour of the surface thereof invariable over time, not being altered through use or exposure to heat, which can thus be used under any circumstances. |
