将位图转换为ImageSource使我的图像的背景为黑色
本文关键字:图像 背景 黑色 我的 位图 转换 ImageSource | 更新日期: 2023-09-27 18:18:04
这是我的代码:
<Image>
<Image.Source>
<Binding Source="{x:Static properties:Resources.myLogo}" Converter="{StaticResource BitmapToImageSourceConverter}" />
</Image.Source>
</Image>
bitmaptoimagesourcecconverter的Convert方法是这个
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
MemoryStream ms = new MemoryStream();
((System.Drawing.Bitmap)value).Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
BitmapImage image = new BitmapImage();
image.BeginInit();
ms.Seek(0, SeekOrigin.Begin);
image.StreamSource = ms;
image.EndInit();
return image;
}
显示的图像就像它应该,但黑色的背景。我试着像这样修复它:
<StackPanel Width="230" Height="80" Grid.Column="0" Margin="85 -40 0 0" HorizontalAlignment="Left" VerticalAlignment="Bottom" Background="Transparent">
<Image>
<Image.Source>
<Binding Source="{x:Static properties:Resources.myLogo}" Converter="{StaticResource BitmapToImageSourceConverter}" />
</Image.Source>
</Image>
</StackPanel>
如何修复黑色背景?
我使用@Dean的答案修复了它:从PNG到BitmapImage。透明度问题。
public BitmapImage ToBitmapImage(Bitmap bitmap)
{
using (MemoryStream stream = new MemoryStream())
{
bitmap.Save(stream, ImageFormat.Png); // Was .Bmp, but this did not show a transparent background.
stream.Position = 0;
BitmapImage result = new BitmapImage();
result.BeginInit();
// According to MSDN, "The default OnDemand cache option retains access to the stream until the image is needed."
// Force the bitmap to load right now so we can dispose the stream.
result.CacheOption = BitmapCacheOption.OnLoad;
result.StreamSource = stream;
result.EndInit();
result.Freeze();
return result;
}
}