枝杈间的明暗变化

一幅仅用两种颜色表现明度变化的简单绘画：你只需一支铅笔、一块橡皮和两支彩铅。首先，用铅笔画出一棵带枝杈的树，留出大量负空间，以便用两种颜色的明暗层次来填充。其次，选择两支色阶渐变的彩铅（例如橙色与红色，或浅蓝色与深蓝色）。

你也可购买此工作纸，用于制作笔记本封面：

要绘制彩色明暗层次，先从某一块区域的一端起笔，用力按压彩铅着色，并向该区域中心逐渐减小力度；再用另一种颜色，从该区域的另一端起笔，由重到轻向中心过渡。如此一来，两种较浅的色调便在中心处自然叠加，形成丰富的明暗变化。

Shades among branches

A simple drawing with value shades in two colors: you need just a pencil, a rubber, and two colored pencils. First, you draw a tree with its branches with a pencil. You create many areas of negative space ready to be filled with shades of two colors. Second, we choose two colored pencils in gradation (like orange and red, or light blue and dark blue).

You can also purchase this worsheet to prepare a notebook cover:

To create the colored shades you begin at one end of the area pressing the colored pencil and decreasing the pressure towards the center of the area. With the other color, you begin at the opposite end, lightening the color towards the center. In this way you overlap the lighter colors in the center, creating the shades.

树枝间的树荫

枝杈间的明暗变化

Shades among branches