Bitmap to Tiff conversion using Libtiff

• Download demo project - 50 KB
• Download source - 177 KB

Introduction

What the article/code snippet does? : It converts 256 color bitmap file to Black & white tiff file using Libtiff.

Why it's useful? : This Article provides a method to convert Bitmap Image to Tiff Image. The main target of this demo project is to tell you about writing a tiff file. I was trying from so long time to get example code that can write tiff file. But no one can provide one as simple as I wished it to be. Now this code would at least help you. I've included the Bitmap Image used in this demo.

Where is Libtiff? : You can get Libtiff Library free from http://www.libtiff.org/. Also, I've included Library files in my demo project. All library contents are as it is provided & with their owner rights. I have no concern with that Library's bugs. I am just using this library to show how to convert a bmp to a tiff.

How to use this code

I've collected all conversion code in a single function which converts bmp to tiff, Function is given below or you can fin this code in demo project.

//load Bitmap


HBITMAP hImage = (HBITMAP)LoadImage(NULL, "C:\\MyBit.bmp", IMAGE_BITMAP,
0, 0, LR_LOADFROMFILE|LR_CREATEDIBSECTION|LR_DEFAULTSIZE);

CBitmap* m_Bitmap = CBitmap::FromHandle(hImage);

//Memory allocation is still 600x600 in your code..

BYTE* bmpBuffer=(BYTE*)GlobalAlloc(GPTR, 600*600);//allocate memory



// Size of bitmap as I draw by using x,y points...

m_Bitmap->GetBitmapBits(600*600 ,bmpBuffer);


TIFF *image;

  // Open the TIFF file

  if((image = TIFFOpen("C:\\output.tif", "w")) == NULL)
  {
    printf("Could not open output.tif for writing\n");
  }

  TIFFSetField(image, TIFFTAG_IMAGEWIDTH,600);
  TIFFSetField(image, TIFFTAG_IMAGELENGTH,600);
  TIFFSetField(image, TIFFTAG_BITSPERSAMPLE,8);
  TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL,1);

  uint32 rowsperstrip = TIFFDefaultStripSize(image, -1); 
  //<REC> gives better compression


  TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
  TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_PACKBITS); 

// Start CCITTFAX3 setting

  
  uint32 group3options = GROUP3OPT_FILLBITS+GROUP3OPT_2DENCODING;
  TIFFSetField(image, TIFFTAG_GROUP3OPTIONS, group3options);
  TIFFSetField(image, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
  TIFFSetField(image, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
  TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, -1L);


// End CCITTFAX3 setting


  TIFFSetField(image, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);

  TIFFSetField(image, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
  TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
 
  TIFFSetField(image, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
  TIFFSetField(image, TIFFTAG_XRESOLUTION, 100.0);
  TIFFSetField(image, TIFFTAG_YRESOLUTION, 100.0);

 
   char page_number[20];
    sprintf(page_number, "Page %d", 1);

    TIFFSetField(image, TIFFTAG_SUBFILETYPE, FILETYPE_PAGE);
    TIFFSetField(image, TIFFTAG_PAGENUMBER, 1, 1);
    TIFFSetField(image, TIFFTAG_PAGENAME, page_number);



  // Write the information to the file

BYTE *bits;
for (int y = 0; y < 600; y++)
  {
    bits= bmpBuffer + y*600;
    if (TIFFWriteScanline(image,bits, y, 0)==-1) MessageBox("Complete or error");
  }

  // Close the file

  TIFFClose(image);

What's New in this update:

1. Improved Compression
2. Multi-page Tiff (Method to add pages in tiff)
3. 256 colors of bmp

What is Next?

1. Color in tiff file
2. Other format to tiff

My wish was to provide you one independent function that can be used anywhere. That's what I did in this article.

What am I expecting from you all?

As I think, I'm not an expert like you, long way yet remain to take over. Please point out my bugs in this article so I can improve those. Thanks, OK! Good Bye, Have a nice life...