将JPEG图像调整为固定宽度，同时保持宽高比不变 [英] Resize JPEG image to fixed width, while keeping aspect ratio as it is

问题描述

如何在保持宽高比的同时将JPEG图像调整为固定宽度?在保持质量的同时，以一种简单的方式.

How would you resize a JPEG image, to a fixed width whilst keeping aspect ratio? In a simple way, whilst preserving quality.

推荐答案

这只会在垂直轴上缩放:

This will scale in the vertical axis only:

    public static Image ResizeImageFixedWidth(Image imgToResize, int width)
    {
        int sourceWidth = imgToResize.Width;
        int sourceHeight = imgToResize.Height;

        float nPercent = ((float)width / (float)sourceWidth);

        int destWidth = (int)(sourceWidth * nPercent);
        int destHeight = (int)(sourceHeight * nPercent);

        Bitmap b = new Bitmap(destWidth, destHeight);
        Graphics g = Graphics.FromImage((Image)b);
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;

        g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
        g.Dispose();

        return (Image)b;
    }

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