| 摘要 |
<p>A portable device for assessing the contrast between two surfaces has a light source (18) for illuminating a surface and a colour sensor (17) both mounted on a handheld body (10), the sensor detecting light from the source and which has been reflected back from a surface under test. A processor (22) converts the sensor output into a colour space determination and then extracts from that the (5) light reflectance value Y of the illuminated surface, the Y values from at least two surfaces then being stored in a memory. The body (10) has a display (11) for immediately showing the difference between the Y values of a chosen two surfaces or of different areas of the same surface.</p> |
