将图像保存为位图而不会降低质量 [英] save an image as a bitmap without losing quality

问题描述

我遇到了打印质量问题，我在此链接中对其进行了描述:在此处输入链接描述

I had a problem of printing quality and I described it in this link : enter link description here

我尝试了许多不同的解决方案来帮助其他有类似问题的人，但它们对我不起作用，因为我有一个将图像保存为位图的新问题(低质量)

I tried many different solutions that helped other guys with similar prob but they don't work for me because I have a new prob of saving image as bitmap(with low quality)

最后我决定问我目前的问题，因为正如你在上面的链接中看到的，我的问题在系统(96dpi)中保存图像并恢复后开始.但我没有办法，所以我正在寻找一种方法，可以在不降低质量的情况下保存图像(具有从图形中绘制的像素).

finally I decided to ask my current question , because as u see in above link , my prob starts after saving the image in system(96dpi) and restoring it . but I have no way so I'm looking for a way that make it possible to save an image (that has pixels drawn from a graphic) without losing quality.

提前谢谢

推荐答案

虽然 96 dpi 适合屏幕显示，但不适用于打印.对于打印，您至少需要 300 dpi 才能使其看起来清晰.

While 96 dpi is fine for screen display, it is not for printing. For printing you need at least 300 dpi to make it look sharp.

出于好奇，我创建了一个 C# 控制台应用程序，它在 600 dpi 位图上打印文本.我想出了这个:

Out of curiosity I created a C# console application that prints a text on a 600 dpi bitmap. I came up with this:

class Program
{
    public static void Main(string[] args)
    {
        const int dotsPerInch = 600;    // define the quality in DPI
        const double widthInInch = 6;   // width of the bitmap in INCH
        const double heightInInch = 1;  // height of the bitmap in INCH

        using (Bitmap bitmap = new Bitmap((int)(widthInInch * dotsPerInch), (int)(heightInInch * dotsPerInch)))
        {
            bitmap.SetResolution(dotsPerInch, dotsPerInch);

            using (Font font = new Font(FontFamily.GenericSansSerif, 0.8f, FontStyle.Bold, GraphicsUnit.Inch))
            using (Brush brush = Brushes.Black)
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.Clear(Color.White);
                graphics.DrawString("Wow, I can C#", font, brush, 2, 2);
            }
            // Save the bitmap
            bitmap.Save("n:\test.bmp");
            // Print the bitmap
            using (PrintDocument printDocument = new PrintDocument())
            {
                printDocument.PrintPage += (object sender, PrintPageEventArgs e) =>
                {
                    e.Graphics.DrawImage(bitmap, 0, 0);
                };
                printDocument.Print();
            }
        }
    }
}

这是打印的结果

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