我想知道在动态生成图像时如何更改背景颜色。
Just use the Graphics object .Clear()
method, passing the color you wish to use for the background.
For example:
g.Clear(Color.Blue);
It's simple:
Graphics graph = Graphics.FromImage(bitmap);
graph.Clear(Color.Yellow); // set color for background
If you're talking about a specific file format's "background color" field, I'm not sure if GDI+ supports that, but usually to set the background color of an image you'd fill a rectangle the size of the image with one color.
Example, assuming g
is your Graphics
object, image
is your Image
object, and color
is your Color
object:
g.FillRectangle(new SolidBrush(color), new Rectangle(Point.Empty, image.Size));
Also, as FlipScript suggested , you can use the Clear
method . (I had no idea it existed!)
g.Clear(color);
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