如何以编程方式调整图像大小 [英] How to resize image programatically

问题描述

我有一个应用程序，我以320 * 480格式存储相机拍摄的图像。但在加载此图像时，我想将图像调整为32 * 32或49 * 37.我可以让我知道如何加载图像，或者我们如何以相应的格式/尺寸存储相机拍摄的图像。 />


编辑

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我得到了即使我使用发布DC，退出时也会出错。 PFB代码

我正在尝试加载大图像并尝试将其调整为更小的尺寸。

 CImage img; 
 CImage sm_img; 
 HRESULT res = img.Load（_T（  D：\\bbb.png））; 
 
 CDC * screenDC = GetDC（）; 
 
  int  iNewWidth =  80 ; 
  int  iNewHeight =  60 ; 
 
 sm_img.Create（iNewWidth，iNewHeight， 32 ）; 
 
 SetStretchBltMode（sm_img.GetDC（），COLORONCOLOR）; 
 img.StretchBlt（sm_img.GetDC（）， 0 ， 0 ，iNewWidth，iNewHeight， SRCCOPY）; 
  //  接下来的两行测试图片控件上的图像。 
  //  输出的调色板错误，就像我的初始版本 
 HDC hdcpic = :: GetDC（hMyWindow）;  //   hMyWindow  - > of capCreateCaptureWindow  
 
 img.StretchBlt（hdcpic， 0 ， 0 ，iNewWidth，iNewHeight，SRCCOPY）; 
 
 sm_img.Save（_T（  D：\\bbb1.png< /跨度>））; 
 sm_img.ReleaseDC（）;  //  这里我发布DC但仍然 
  //  此代码在退出时出错 
 ReleaseDC（screenDC）; 
 

请告诉我可能是什么问题。



提前致谢。

解决方案

现有的问题解决方案可能符合您的需求。请看一下：如何使用CImage类调整位图大小 [ ^ ]。



问候，

- Manfred

Hi,

I have an application where I am storing images captured by camera in 320 * 480 format. But while loading this image I want to resize the image up to 32 * 32 OR 49 * 37. Can someone let me know how could we load the image or how could we store the images captured by camera in desired format / size.

EDIT
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Hi,
I am getting the error while exiting even if I use the release DC. PFB the code
I am trying to load big image and trying to resize it to smaller size.

CImage img;
CImage sm_img;
HRESULT res = img.Load(_T("D:\\bbb.png"));

CDC *screenDC = GetDC();

int iNewWidth = 80;
int iNewHeight = 60;

sm_img.Create(iNewWidth, iNewHeight,32);

SetStretchBltMode(sm_img.GetDC(),COLORONCOLOR);
img.StretchBlt(sm_img.GetDC(),0, 0, iNewWidth, iNewHeight, SRCCOPY);
// The next two lines test the image on a picture control.
// The output has wrong color palette, like my initial version
HDC hdcpic = ::GetDC(hMyWindow);//hMyWindow --> of capCreateCaptureWindow

img.StretchBlt( hdcpic,0, 0, iNewWidth, iNewHeight, SRCCOPY);

sm_img.Save(_T("D:\\bbb1.png"));
sm_img.ReleaseDC(); // Here I release the DC but still
                        // this code is giving error while exiting
ReleaseDC(screenDC);

Please suggest me what could be the problem.

Thanks in advance.

解决方案

There is an already existing question with a solution that might fit your needs. Have a look at this please: How to use CImage class to resize a bitmap[^].

Regards,

— Manfred

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