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请问那里有显示，操作，保存，TIFF 文件的库可供免费下载（up 有分）

peterleex 上海华东师范大学 2003-07-08 09:44:28

codeproject 的那个 Graphics-Suite 不好用

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ayixidaiyilu 2003-11-13

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Skt32 2003-07-14

Tag Image File Format (TIFF) files are used for a diverse set of applications such as GIS (geographic information systems), CAD drawing programs, etc... Fortunately for programmers like us, a portable and easy to use library is freely available, from www.libtiff.org, for decoding the information stored in TIFF files.

This article outlines and provides an implementation of a simple approach that will allow you to include support for TIFF files in your applications with a few library calls.

Here is an outline of the approach:

Use the "TIFFOpen" call passing in a filename and io mode.
Use the "TIFFGetField" function to read the image height and width tags, then allocate the required space (WxHx4).
Use "TIFFReadRGBAImage" to copy the actual pixel data from the file to the space you just allocated.
Copy the raster data to a Device Independent Bitmap (DIB) using care to maintain the picture layout.
Delete the allocated space for the pixel data.
Call "TIFFClose" to free resources allocated in the library.
Draw the DIB to the screen.
The following code sample implements the approach outlined above:

void TIFFTestDoc::OnFileOpen()
{
CString file_types =
"TIFF Files(*.tiff,*.tif)|*.tif;*.tiff;*.tif;||";

CFileDialog dlg(TRUE,
NULL,
NULL,
OFN_HIDEREADONLY | OFN_EXPLORER,
(LPCTSTR)file_types,NULL);
if (dlg.DoModal() == IDOK)
{
m_filename = dlg.GetPathName();

// 1) Open this puppy up
TIFF * tiff = TIFFOpen((char*)(LPCTSTR)m_filename,"r");
if (tiff)
{

int w=0, h=0;

// 2)
// Get the width and height of the image

TIFFGetField(tiff,TIFFTAG_IMAGEWIDTH, &w);

TIFFGetField(tiff,TIFFTAG_IMAGELENGTH, &h);

if ((w > 0) && (h > 0))
{

// allocate space for the image

uint32 * raster =
(uint32*)GlobalAlloc(GMEM_FIXED,
(w * h * sizeof (uint32)));

if (raster)
{

// creating DIBSection object that encapsulates
// DIB functionality

if (m_dib)
delete m_dib;

m_dib = new DIBSection;

if (m_dib)
{
m_dib->Create(w,h,32);

uint32 dibwidth = m_dib->GetTotalWidth();

// 3)
// copy all the pixel data from the file into
// allocated space

if (TIFFReadRGBAImage(tiff, w, h, raster, 0))
{
// 4)
// its tempting to copy straight to the DIB,
// however the DIB has an alignment
// restriction that is not applicable to
// tiff files...so they may have different
// widths

unsigned long * dest =
(unsigned long *)m_dib->GetBits();

unsigned long * src =
(unsigned long *)raster;

for (int row = 0; row < h; row++){

void * ptr_dest = dest + row * dibwidth;
void * ptr_src = src + row * w;
memcpy(ptr_dest,ptr_src,w*sizeof(int));
}
SetTitle(m_filename);
UpdateAllViews(NULL);
}
}

// 5)
// free the temporary pixel storage space
GlobalFree(raster);
}
}

// 6)
// notify the TIFF library that we are done
// with this puppy
TIFFClose(tiff);
}
}
}
void TIFFTestView::OnDraw(CDC* pDC)
{
TIFFTestDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);

DIBSection * dib = pDoc->GetDIB();

if (pDC->IsPrinting())
{}
else
{
if (dib)
{
CClientDC dc(this);
CPoint sp = GetScrollPosition();
dib->Draw(&dc,sp.x,sp.y);
}
}
}
Additional information about the sample project:

The sample project includes debug and release versions of the TIFF library files that I built, plus header files for the library. This is the minimum required to build the sample project. If you have an interest in working with TIFF files on an ongoing basis I highly recommend that you download the source files and build environment from www.libtiff.org and go through the library build process...it can be painful, but worthwhile in terms of understanding the library.

In 256 color mode the colors may not be correct, but in 16-bit, 24-bit, and 32-bit color mode everything looks fine.

Downloads
Download demo project - 220Kb http://www.codeguru.com/bitmap/tiff_image.zip

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Skt32 2003-07-14

http://www.codeproject.com/bitmap/cximage.asp

CxImage
1 May 2003
CxImage is a C++ class to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, ICO, PCX, TGA, WMF, WBMP, JBG, J2K images.

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