Darker traces signifiy slower speeds, and colour coding shows the density of traffic in different areas.
较深色的线条表示航行速度较慢，条码的颜色代表不同区域的交通密度。
A new format for bar codes appeared in January, when Microsoft unveiled Tag, a system that USES colour to increase the density of information that can be stored.
今年一月，微软发布了Tag，一种新的条形码格式，它利用各种颜色来增加它所承载的信息密度。
The optical methods of pseudocolor encoding of black and white picture based on density encoding some colour have been presented, but all methods required encoding process.
将黑白图象用光学手段按其密度编成各种颜色的方法，已有些报道，但均需编码过程。
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