高品质保存图像 [英] save image with high quality

问题描述

嗨
i有一个图像，即时通讯使用LinearGradientBrush进行图像写入，但它将图像质量改为低质量，并且在保存图像时黯淡

我应该怎么做不改变保存质量？

我的保存代码

Hi i have an image and i m using LinearGradientBrush for write on image but it change image quality to low quality and blear on save the image
what should i do it don't change quality on save?
my save code

bp = new Bitmap(pictureBox1.Image, width, height);
Graphics g = Graphics.FromImage(bp);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.CompositingQuality = CompositingQuality.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
bp.Save(save.FileName);

这些是问题的图片

1-original image

原始图片 [ ^ ]

2 - 这是用LinearGradientBruh写的图像

使用LinearGradientBruh 写在图像上[ ^ ]

最好的问候

and these are pictures of problem
1-original image
Original Image[^]
2-and this is the image wrote on it with LinearGradientBruh
wrote on image with LinearGradientBruh [^]
Best Regards

推荐答案

你可能知道，jpeg正在使用有损压缩方法。因此，您可以指定压缩质量。仍然没有直截了当。请参阅此处： http://msdn.microsoft.com/en-us/ library / bb882583（v = vs.110）.aspx [ ^ ]。我已经读过它默认为75％，但我没有找到任何可靠的参考资料。

As you probably know, jpeg is using a lossy compression method. Thus it is up to you to specify comression quality. Still it is not straighforward. See here: http://msdn.microsoft.com/en-us/library/bb882583(v=vs.110).aspx[^]. I have read that it is 75% by default, but I haven't found any reliable reference about.

如何：使用文本抗锯齿[ ^ ]。



当使用SmoothingMode枚举指定Graphics.SmoothingMode属性时，它不会影响文本。要设置文本呈现质量，请使用Graphics.TextRenderingHint属性和TextRenderingHint枚举。 [ ^ ]。



您的代码不会在图像上显示任何文字呈现。



是您的来源图片.jpg？或????



你用的是什么字体;是OpenType吗？



为什么要使用LinearGradientBrush来做文本？你的第二张照片显示没有任何渐变被应用于文字的证据。



你在油漆事件中做什么？



我认为您应该将源图像转换为.png图像，然后在其上绘制文本，并将其保存为.png：[ ^ ]。

"How to: Use Antialiasing with Text" [^].

"When the Graphics.SmoothingMode property is specified by using the SmoothingMode enumeration, it does not affect text. To set the text rendering quality, use the Graphics.TextRenderingHint property and the TextRenderingHint enumeration." [^].

Your code does not show any rendering of Text on the image.

Is your source picture a .jpg ? Or ????

What font are you using; is it OpenType ?

Why would you use a LinearGradientBrush to do Text ? Your second picture shows no evidence of any gradient being applied to the Text.

What are you doing in the Paint Event ?

I think you should take your source image turn it into a .png image, then draw the Text on it, and save it as .png: [^].

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