When drawing with Cairo, the simplest operations are akin to choosing your medium, selecting a brush, choosing a color, thinking about the line placement, then actually drawing the lines.
He demonstrates how the pencil is the perfect medium for drawing the portrait.
他演示了铅笔是怎样作为画肖像最理想的工具的。
3
In the research of image processing, this paper clears away noises to lift the image clarity aimed at the noise arisen in engineering drawing by means of mean filtering and medium filtering etc.