jpg文件保存后分辨率降低？
用了CImage类，Load进图片并Save，但时得到的图片的分辨率是96，怎么能改到300？
打算做一个排版的软件，保存Jpg有问题，代码如下：
CString strFilter;
CString strFileName;
CString strExection;
COLORREF color = RGB(255, 255, 255);
CBrush brush;
CMainFrame* pFrame = (CMainFrame*)AfxGetMainWnd();
LeftView* pLeftView = (LeftView*)pFrame-> GetSplitterLeftWnd()-> GetPane(0, 0);
CImage tmpImage;

if(!brush.CreateSolidBrush(color))
return;
CRect rect;
rect.left = 0;
rect.top = 0;
rect.bottom = 4430;
rect.right = 2010;

if(pLeftView-> m_pImageNameList-> GetSize() < 1)
{
if(!tmpImage.IsNull())
tmpImage.Destroy();
return;
}
CDC* pImageCDC = CDC::FromHandle(m_image.GetDC());
//pImageCDC-> SetViewportExt(2010*300/96, 4430*300/96);
HDC hDC = pImageCDC-> m_hDC;
//pImageCDC-> SetMapMode(MM_ANISOTROPIC);
pImageCDC-> FillRect(&rect, &brush);
CString strTemp;
LeftBottomView* pView = (LeftBottomView*)pFrame-> GetSplitterLeftWnd()- > GetPane(1, 0);
TCHAR* str = new TCHAR(20);
int lenth = pView-> m_pMyEdit-> GetWindowText(str, 20);
int index = 0;
POSITION pos;
pos = pLeftView-> m_pImageNameList-> GetHeadPosition();
while(index < pLeftView-> m_pImageNameList-> GetSize())
{
tmpImage.Load(pLeftView-> m_pImageNameList-> GetAt(pos).c_str());
for(int i = 0; i < 8; i++){
tmpImage.Draw(hDC, 40+(i%2)*(30+PHOTO_WIDTH_V) + index%2* 1000, 100+i/2*(45+PHOTO_HEIGHT_V)+ index/2 * 1430/*, PHOTO_WIDTH_V, PHOTO_HEIGHT_V*/);
MyDrawText(pImageCDC, 40+(i%2)*(30+PHOTO_WIDTH_V)+90+index%2* 1000, 100+i/2*(45+PHOTO_HEIGHT_V)+PHOTO_HEIGHT_V+index/2 * 1430, str);
}
pLeftView-> m_pImageNameList-> GetNext(pos);
index++;
}
CFileDialog dlg(FALSE, NULL, NULL, OFN_OVERWRITEPROMPT | OFN_EXPLORER, "File(*.jpg)|*.jpg|| ");

dlg.DoModal();

strExection= ".jpg ";
strFileName = dlg.m_ofn.lpstrFile;
strFileName = strFileName + strExection;

if(strFileName == ".jpg ")
return;

m_image.Save(strFileName);

[解决办法]
mark,什么意思，能说清楚些吗？
[解决办法]
GDI+是一个绘图库。如果你要一个图形处理库，去搜索CxImage
[解决办法]
用cximage多好啊
[解决办法]
你是用CImage tmpImage load图片和绘制图片！
你为什么用m_image.Save(strFileName)呢。
改为
tmpImage .Save(strFileName)试试吧。