CSharp

using ImageProcessor;
using System;
using System.Drawing;

internal class WebpClass
{
    public static (bool successful, Image image, string error) LoadPicture(string fileName)
    {
        try
        {
            using (ImageFactory pif = new ImageFactory())
            {
                var result = pif.Load(fileName);
                if (result.Image != null)
                {
                    return (true, new Bitmap(pif.Load(fileName).Image), null);
                }
                else
                {
                    return (false, null, "读取失败！");
                }
            }
        }
        catch (Exception ex)
        {
            return (false, null, ex.Message);
        }
    }

    public static (bool successful, string error) SaveWebp(string fileName, Image img, int quality = 100)
    {
        try
        {
            using (ImageFactory pif = new ImageFactory())
            {
                pif.Load(img);
                pif.PreserveExifData = true;
                pif.Format(new ImageProcessor.Plugins.WebP.Imaging.Formats.WebPFormat() { Quality = quality <= 50 ? 50 : quality });
                pif.Save(fileName);

                return (true, null);
            }
        }
        catch (Exception ex)
        {

            return (false, ex.Message);
        }
    }
}

VB.NET

Imports ImageProcessor

Public Class webp

    ''' <summary>
    ''' 将输入的图像保存为webp图像。
    ''' </summary>
    ''' <param name="fn"></param>
    ''' <param name="img"></param>
    ''' <param name="quality"></param>
    ''' <returns></returns>
    Shared Function SaveWebp(fn As String, img As Image, Optional quality As Integer = 100) As Boolean
        Try
            Using ipf As New ImageFactory

                ipf.Load(img)
                ipf.PreserveExifData = False
                ipf.Format(New Plugins.WebP.Imaging.Formats.WebPFormat() With {.Quality = If(quality <= 50, 50, quality)})
                ipf.Save(fn)

                Return True

            End Using
        Catch ex As Exception
            'MessageBox.Show($"保存webp失败!{ex.Message}", "webp", MessageBoxButtons.OK, MessageBoxIcon.Warning)
            Return False
        End Try
    End Function

    ''' <summary>
    ''' 读取指定文件名的文件，返回图像。
    ''' </summary>
    ''' <param name="fn"></param>
    ''' <returns></returns>
    Shared Function Load(fn As String) As Image
        Try
            Using pif As New ImageFactory
                Return New Bitmap(pif.Load(fn).Image)
            End Using
        Catch ex As Exception
            'MessageBox.Show($"保存webp失败!{ex.Message}", "webp", MessageBoxButtons.OK, MessageBoxIcon.Warning)
            Return Nothing
        End Try
    End Function

End Class