如何压缩为JPEG2000格式的图像 [英] How to compress to image in the form of JPEG2000

问题描述

大家好，

我想以JPEG2000的形式压缩图像
使用宽高比，最大尺寸为150(高度，宽度)，
我想将图片缩小到1kb(最大1100个字节)
我以以下方式编写，在这种情况下，我可以正确获得宽高比，但是
我将图片大小设为4至5 kb
1)如何将此大小减小到1kb(最大1100个字节).
2)我必须使用最大尺寸为150(高度，宽度)的
请向我发送这两个问题的代码.
我的代码是:

Hi all,

I want to compress the images in the form of JPEG2000
and maximum size is 150(height, width) by using aspect ratio,
and I want to reduce the image to 1kb (maximum 1100 bytes)
I have written in the following way , In this case I got aspect ration properly but
I got image size to 4 to 5 kb
1)How to reduce this size to 1kb (maximum 1100 bytes) .
2)I must use maximum size is 150(height, width)
Please send me code for these two questions.
My code is :

public void Resize(Image originalImage)
   { 
   int targetHeight, targetWidth,targetsize=150;
   if(originalImage.Height>originalImage.Width)
      {
      targetHeight = targetSize;
      targetWidth = (int)(originalImage.Width * ((float)targetSize / (float)originalImage.Height));
      }
   else
      {
      targetWidth = targetSize;
      targetHeight = (int)(originalImage.Height * ((float)targetSize / (float)originalImage.Width));
      }
   Bitmap newImage = new Bitmap(originalImage, targetWidth, targetHeight);
   Graphics g = Graphics.FromImage(newImage); 
   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear; 
   g.DrawImage(originalImage, 0, 0, newImage.Width, newImage.Height);
   originalImage.Dispose();
   newImage.Save(@"D:\Images\hello.j2k", System.Drawing.Imaging.ImageFormat.Jpeg);
   }

3)如何以字节格式上传此压缩图像?

请向我发送以上三个问题的答案

谢谢

[edit]已添加代码块-OriginalGriff [/edit]

3)How to upload this compressed image in byte format ?

Please send me answers for above three questions

Thank you

[edit]Code Block added - OriginalGriff[/edit]

推荐答案

1)对于Jpeg文件，无法保证图像文件具有任何特定大小:取决于图像数据可以应用多少压缩.所以，您的第一个问题没有答案...

2)您已提供问题2的代码:问题出在哪里?

3)上传到哪里?你想做什么?

顺便说一句:您没有创建originalImage，所以您不应废弃它:如果在此方法之外使用它会怎样.仅处置您创建的项目.不过，您绝对应该处置图形"g"和位图"newImage".

1) With a Jpeg file, there is no way to guarantee that the image file is any particular size: it depends on the image data how much compression can be applied. So, your first question has no answer...

2) You have provided code for question 2: what is the problem?

3) Upload to where? What are you trying to do?

BTW: You did not create originalImage, so you should not be disposing of it: what if it is used outside this method. Only dispose items you created. You should definitely Dispose your Graphics "g" and Bitmap "newImage" though.

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