NPOI EXCEL 插入图片 导致EXCEL 文件过大，可以进行压缩图片在插入

是的，可以进行图片压缩以减小导出的Excel文件大小。在使用NPOI插入图片时，可以先将图片进行压缩，然后再将压缩后的图片插入Excel中。可以使用.NET中的System.Drawing.Bitmap类进行图片压缩，具体实现可以参考以下代码：

using System.Drawing;
using System.Drawing.Imaging;

// 压缩图片并返回压缩后的Image对象
private Image CompressImage(Image image, int maxWidth, int maxHeight, long quality)
{
    // 对图片进行等比缩放
    int width = image.Width;
    int height = image.Height;
    if (width > maxWidth)
    {
        height = (int)(height * ((double)maxWidth / width));
        width = maxWidth;
    }
    if (height > maxHeight)
    {
        width = (int)(width * ((double)maxHeight / height));
        height = maxHeight;
    }

    // 创建压缩后的图片
    Bitmap bitmap = new Bitmap(width, height);
    Graphics graphics = Graphics.FromImage(bitmap);
    graphics.CompositingQuality = CompositingQuality.HighQuality;
    graphics.SmoothingMode = SmoothingMode.HighQuality;
    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
    graphics.DrawImage(image, new Rectangle(0, 0, width, height));

    // 保存压缩后的图片
    EncoderParameters encoderParams = new EncoderParameters(1);
    encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
    ImageCodecInfo codecInfo = GetEncoderInfo("image/jpeg");
    MemoryStream stream = new MemoryStream();
    bitmap.Save(stream, codecInfo, encoderParams);
    Image compressedImage = Image.FromStream(stream);

    // 释放资源
    graphics.Dispose();
    bitmap.Dispose();
    stream.Dispose();

    return compressedImage;
}

// 获取指定格式的Image编码器
private ImageCodecInfo GetEncoderInfo(string mimeType)
{
    ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
    for (int i = 0; i < encoders.Length; i++)
    {
        if (encoders[i].MimeType == mimeType)
        {
            return encoders[i];
        }
    }
    return null;
}

在插入图片时，调用上述方法对图片进行压缩，然后再将压缩后的图片插入Excel中即可。