无法让渐变透明边框正确显示

发布于 2024-10-02 13:49:26 字数 714 浏览 1 评论 0原文

我无法让表单背景图像以渐变透明度正确显示。也就是说，图像的边缘（或任何地方）具有褪色或非 255 Alpha 值。结果是，在 Alpha 不是 255（或 0 - 我不记得）的地方，我看到了我的背景颜色。是屏幕截图：

这我在此设置中有一个带有绿色背景的 24 位 bmp 文件，我试图通过 Form.TransparencyKey 属性键入该文件：

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);

    Color key = ((Bitmap)this.BackgroundImage).GetPixel(0, 0);
    this.TransparencyKey = key;
}

我还尝试将 Form 的 BackColor 属性设置为相同的键值，但这没有什么区别。

我还尝试将图像保存为具有透明度的 png 并抠出整个表单背景，但这也不起作用。

我知道这是可能的，我已经看到像 Photoshop 这样的应用程序使用它已有十年了。如果这很重要的话，我使用的是WinXP Pro。

任何人都有这方面的经验，并知道我错过了什么步骤或做得不正确吗？

原文

I am having trouble getting my Form background image to display correctly with a gradient transparency. That is, the edge of the image (or anywhere for that matter) has a fading or non-255 Alpha value. The result is that everywhere the Alpha is NOT 255 (or 0 - I can't remember) I see my background color. Here is a screen shot:

What I have in this setup is a 24bit bmp file with a green background that I'm trying to key out via the Form.TransparencyKey property:

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);

    Color key = ((Bitmap)this.BackgroundImage).GetPixel(0, 0);
    this.TransparencyKey = key;
}

I have also tried setting the Form's BackColor property to the same key value but that did not make a difference.

I also tried saving my image as a png with transparency and keying out the entire form background but that didn't work either.

I know this is possible somehow, I've seen applications like Photoshop use this for a decade. I'm on WinXP Pro if that matters.

Anyone have experience with this and have an idea what step I'm missing or doing incorrectly?

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