在透明像素顶部使用DrawString进行错误文本渲染 [英] Bad text rendering using DrawString on top of transparent pixels

问题描述

当将文本渲染到位图中时，我发现当在具有非透明alpha区域的顶部渲染文本时，文本看起来非常糟糕.随着下面的像素变得更加透明，问题变得越来越严重.如果我不得不猜测，我会说当基础像素是透明的时，文本渲染器会将所有抗锯齿的灰色"像素绘制为纯黑色.

When rendering text into a bitmap, I find that text looks very bad when rendered on top of an area with non-opaque alpha. The problem is progressively worse as the underlying pixels become more transparent. If I had to guess I'd say that when underlying pixels are transparent, the text renderer draws any anti-aliased 'gray' pixels as solid black.

以下是一些屏幕截图:

在透明像素上方绘制的文本:

在半透明像素上方绘制的文本:

在不透明像素上绘制的文本:

以下是用于呈现文本的代码:

Here is the code used to render the text:

g.SmoothingMode = SmoothingMode.HighQuality;
g.DrawString("Press the spacebar", Font, Brushes.Black, textLeft, textTop);

推荐答案

我用来解决此问题的选项是:

The option I used to workaround this problem was:

Graphics graphics = new Graphics();
graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;

TextRenderingHint中还有一些其他有用的选项

There are some others useful options in TextRenderingHint

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