C / C++ / MFC

<code>
	HDC pDC=::GetDC(0);
HDC TmpDC=CreateCompatibleDC(pDC);
CImage _image;
_image.Load(_T("//read.tif"));
int width=_image.GetWidth();
int height=_image.GetHeight();
HGDIOBJ TmpObj2 = SelectObject(TmpDC,(HGDIOBJ)(HBITMAP)_image);			
Rectangle(TmpDC, 0,0, width/2, height/2 );
SelectObject(TmpDC,TmpObj2);
_image.Save( _T("D:\\newy.jpg"), Gdiplus::ImageFormatBMP);
::ReleaseDC(NULL,pDC);

</code>

HDC pDC=::GetDC(0);
HDC TmpDC=CreateCompatibleDC(pDC);
CImage _image;
_image.Load(_T("//read.tif"));
int width=_image.GetWidth();
int height=_image.GetHeight();
HGDIOBJ TmpObj2 = SelectObject(TmpDC,(HGDIOBJ)(HBITMAP)_image);			

int newWidth  = width/2;
int newHeight = height/2;
HDC NewDC = CreateCompatibleDC(TmpDC);
HBITMAP NewBitmap = CreateCompatibleBitmap(TmpDC, newWidth, newHeight);
HGDIOBJ NewTmpObj = SelectObject(NewDC, NewBitmap);

BitBlt(NewDC, 0, 0, newWidth, newHeight, TmpDC, 0, 0, SRCCOPY);

SelectObject(NewDC, NewTmpObj);
DeleteDC(NewDC);

SelectObject(TmpDC,TmpObj2);
::ReleaseDC(NULL,pDC);

CImage newImage;
newImage.Attach(NewBitmap);
newImage.Save( _T("D:\\newy.jpg"), Gdiplus::ImageFormatJPEG);
DeleteObject(NewBitmap); //Is this needed, will CImage destroy the bitmap or not?

// First load the original image
CImage imageOriginal;
imageOriginal.Load(_T("Here is the path to your original image"));

// Make a copy of the original image
CImage imageNew;
imageNew.Create(imageOriginal.GetWidth(), imageOriginal.GetHeight(), imageOriginal.GetBPP());
imageOriginal.BitBlt(imageNew.GetDC(), CPoint(0,0));
imageNew.ReleaseDC();

// Now imageNew holds the copy of original image
....

// First load the original image
CImage imageOriginal;
imageOriginal.Load(_T("Here is the path to your original image"));

// Here is the rect that we will copy from the original image (in this case 1/4 of it)
CRect rectCopy(0, 0, imageOriginal.GetWidth() / 2, imageOriginal.GetHeight() / 2);
	
// Make a copy of the specific part
CImage imageNew;
imageNew.Create(rectCopy.Width(), rectCopy.Height(), imageOriginal.GetBPP());
imageOriginal.BitBlt(imageNew.GetDC(), rectCopy, rectCopy.TopLeft());
imageNew.ReleaseDC();

// Now imageNew holds the copy of the specific part from original image

CImage imageOriginal;
imageOriginal.Load(_T( "read.tif" ));

// Here is the rect that we will copy from the original image (in this case 1/4 of it)
//CRect rectCopy(0, 0, imageOriginal.GetWidth() / 2, imageOriginal.GetHeight() / 2);

<code>CRect rectCopy(9177,68, 10566, 635);</code>

// Make a copy of the specific part
CImage imageNew;
imageNew.Create(rectCopy.Width(), rectCopy.Height(), imageOriginal.GetBPP());
imageOriginal.BitBlt(imageNew.GetDC(), rectCopy, rectCopy.TopLeft());
imageNew.Save(_T("D://imgnew.jpg"));

imageNew.ReleaseDC();

rajugis wrote:

when i gave this rect portion ..the saving images contains ..full black

// Check for color table after the creation of the new image
if(imageOriginal.IsIndexed())
{
	// If there is a color table for the original image
	// copy this table for the new image too.
	const int nMaxColors = imageOriginal.GetMaxColorTableEntries();
	RGBQUAD* pColorTable = new RGBQUAD[nMaxColors];
	imageOriginal.GetColorTable(0, nMaxColors, pColorTable);
	imageNew.SetColorTable(0, nMaxColors, pColorTable);
	delete [] pColorTable;
}

void CTestCImageAppDlg::OnBnClickedButtonTest()
{
	// First load the original image
	CImage imageOriginal;
	HRESULT hrLoad = imageOriginal.Load(_T("D:\\testImg1.tif"));
	if(FAILED(hrLoad))
	{
		CString msg;
		msg.Format(_T("Error on load. Code:%08x"), hrLoad);
		AfxMessageBox(msg);
		return;
	}
	
	// Here is the rect that we will copy from the original image (in this case 1/4 of it)
	CRect rectCopy(0, 0, imageOriginal.GetWidth() / 2, imageOriginal.GetHeight() / 2);

	// Create the new image
	CImage imageNew;
	imageNew.Create(rectCopy.Width(), rectCopy.Height(), imageOriginal.GetBPP());
	
	// Check the original image for color table 
        // after the creation of the new image
	if(imageOriginal.IsIndexed())
	{
		// If there is a color table for the original image
		// copy this table for the new image too.
		const int nMaxColors = imageOriginal.GetMaxColorTableEntries();
		RGBQUAD* pColorTable = new RGBQUAD[nMaxColors];
		imageOriginal.GetColorTable(0, nMaxColors, pColorTable);
		imageNew.SetColorTable(0, nMaxColors, pColorTable);
		delete [] pColorTable;
	}

        CRect rect(rectCopy);
        rect.OffsetRect(-rectCopy.left, -rectCopy.top);
	
        // Now we can blit the original image on the new image
	imageOriginal.BitBlt(imageNew.GetDC(), rect, rectCopy.TopLeft());

	// It is good to release the DC first
	imageNew.ReleaseDC();


	// Lets save the new image
	HRESULT hrSave = imageNew.Save(_T("D:\\testImg2.tif"), Gdiplus::ImageFormatTIFF);
	if(FAILED(hrSave))
	{
		CString msg;
		msg.Format(_T("Error on save. Code:%08x"),hrSave);
		AfxMessageBox(msg);
		return;
	}
}

hrishiS wrote:

how we compile them?