VB will color bitmap into a grayscale (black and white image), with a program source.

说明：VB将彩色位图转化为灰度图（黑白图像），附带程序源码。

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Because the background bitmap can only be black and White (Grayscale), all the lines will be created in the red layer, (or any color different than black)?

由于位图的背景只能是黑与白(灰度)，所有的线将建立在红层，(或任选任何颜色不同于黑色)？

youdao

How to apply the grayscale effect to the Bitmap image?

如何运用灰度效果的位图图像？

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