[英]Convert PNG to GIF or JPG
我正在尝试将 png 图像转换为 gif 和 jpg 格式。 我正在使用在Microsoft 文档中找到的代码。
我通过将此代码修改为以下代码创建了git-hub 示例:
public static void Main(string[] args)
{
// Load the image.
using (Image png = Image.FromFile("test-image.png"))
{
var withBackground = SetWhiteBackground(png);
// Save the image in JPEG format.
withBackground.Save("test-image.jpg");
// Save the image in GIF format.
withBackground.Save("test-image.gif");
withBackground.Dispose();
}
}
private static Image SetWhiteBackground(Image img)
{
Bitmap imgWithBackground = new Bitmap(img.Width, img.Height);
Rectangle rect = new Rectangle(Point.Empty, img.Size);
using (Graphics g = Graphics.FromImage(imgWithBackground))
{
g.Clear(Color.White);
g.DrawImageUnscaledAndClipped(img, rect);
}
return imgWithBackground;
}
所以我的问题是:有没有办法从看起来相同的 png 中获取 gif 格式?
编辑: Hans Passant指出根本问题是透明背景。 经过一番挖掘,我在这里找到了答案。 我使用链接中提到的代码将背景设置为白色:
private Image SetWhiteBackground(Image img)
{
Bitmap imgWithBackground = new Bitmap(img.Width, img.Height);
Rectangle rect = new Rectangle(Point.Empty, img.Size);
using (Graphics g = Graphics.FromImage(imgWithBackground))
{
g.Clear(Color.White);
g.DrawImageUnscaledAndClipped(img, rect);
}
return imgWithBackground;
}
类似( https://docs.sixlabors.com/articles/ImageSharp/GettingStarted.html ):
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;
// Open the file and detect the file type and decode it.
// Our image is now in an uncompressed, file format agnostic, structure in-memory as a series of pixels.
using (Image image = Image.Load("test-image.png"))
{
// The library automatically picks an encoder based on the file extensions then encodes and write the data to disk.
image.Save("test.gif");
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.