| 摘要 |
<p>Visible images are produced by directing pulsed or continuous wave laser radiation imagewise towards a substrate having thereon a plurality of continuous layers each having respectively different hues and/or reflection densities, so as to cause an imagewise distribution of discontinuities in the layers by ablation of respective selected portions of the layers, the distribution of discontinuities constituting the visible image. The substrate has layers comprising pigmented or photochromic material.</p> |
