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2004.07.29 16:29 "Re: Saving multiple images to a tiff file...", by Andrey Kiselev
On Mon, Jul 26, 2004 at 06:23:23AM -0600, Sanjay Gupta wrote:
> I have a set of pixel data, which i want to store in a tiff file.
> All the elements from set of pixel data needs to be saved in the
> same file, thereby creating a tiff file with multiple images.
>
> I have the following code,
> for (k = 0; k < frameCount; k++) {
> data = image->frameDimensionList [j].frames [k];
> TIFFSetField (tiff, TIFFTAG_IMAGEWIDTH, data.Width);
> TIFFSetField (tiff, TIFFTAG_IMAGELENGTH, data.Height);
> TIFFSetField (tiff, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
>
> TIFFSetField (tiff, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
>
> TIFFSetField (tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
> TIFFSetField (tiff, TIFFTAG_SAMPLESPERPIXEL, 4); /* Hardcoded
> 32bbps*/
> TIFFSetField (tiff, TIFFTAG_BITSPERSAMPLE, 8);
>
> linebytes = data.Stride;
> TIFFSetField (tiff, TIFFTAG_ROWSPERSTRIP, TIFFDefaultStripSize
> (tiff, linebytes));
>
> /*write data*/
> for (i = 0; i < data.Height; i++) {
> if (TIFFWriteScanline (tiff, data.Scan0 + i *
> data.Stride, i, 0) < 0) /*Scan0 points to the char * for pixels*/
> break;
> }
>
> TIFFWriteDirectory (tiff);
> }
>
> Now when i try to reload the image from my program, the saved file is
> not recognized as a valid tiff file. The problem what i am seeing is,
> my program is not saving the correct dircount for the tiff file, and
> while reading the tiff image, some junk value is read, because of
> which loading of image doesnt work. What else needs to be done in my
> above code, to make it work properly. The above piece of code works
> fine it there is only 1 image which needs to go in a tiff file.
Sanjay,
I have attached a sample code to create the multipage TIFF. Note, that
the following imortant peace of code missed in your source:
/* We are writing single page of the multipage file */
TIFFSetField(out, TIFFTAG_SUBFILETYPE, FILETYPE_PAGE);
/* Set the page number */
TIFFSetField(out, TIFFTAG_PAGENUMBER, page, NPAGES);
I have posted that source here several times, so don't forget to search
the list archive from time to time: Joris has made a very good job to
set up powerful Web interface for our archive!
Andrey
--
Andrey V. Kiselev
Home phone: +7 812 5274898 ICQ# 26871517
#include <stdio.h>
#include "tiffio.h"
#define XSIZE 256
#define YSIZE 256
#define NPAGES 10
int main (int argc, char **argv)
{
uint32 image_width, image_height;
float xres, yres;
uint16 spp, bpp, photo, res_unit;
TIFF *out;
int i, j;
uint16 page;
unsigned char array[XSIZE * YSIZE];
for (j = 0; j < YSIZE; j++)
for(i = 0; i < XSIZE; i++)
array[j * XSIZE + i] = (unsigned char)(i * j);
out = TIFFOpen("out.tif", "w");
if (!out)
{
fprintf (stderr, "Can't open %s for writing\n", argv[1]);
return 1;
}
image_width = XSIZE;
image_height = YSIZE;
spp = 1; /* Samples per pixel */
bpp = 8; /* Bits per sample */
photo = PHOTOMETRIC_MINISBLACK;
for (page = 0; page < NPAGES; page++)
{
TIFFSetField(out, TIFFTAG_IMAGEWIDTH, image_width / spp);
TIFFSetField(out, TIFFTAG_IMAGELENGTH, image_height);
TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, bpp);
TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, spp);
TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(out, TIFFTAG_PHOTOMETRIC, photo);
TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_BOTLEFT);
/* It is good to set resolutions too (but it is not nesessary) */
xres = yres = 100;
res_unit = RESUNIT_INCH;
TIFFSetField(out, TIFFTAG_XRESOLUTION, xres);
TIFFSetField(out, TIFFTAG_YRESOLUTION, yres);
TIFFSetField(out, TIFFTAG_RESOLUTIONUNIT, res_unit);
/* We are writing single page of the multipage file */
TIFFSetField(out, TIFFTAG_SUBFILETYPE, FILETYPE_PAGE);
/* Set the page number */
TIFFSetField(out, TIFFTAG_PAGENUMBER, page, NPAGES);
for (j = 0; j < image_height; j++)
TIFFWriteScanline(out, &array[j * image_width], j, 0);
TIFFWriteDirectory(out);
}
TIFFClose(out);
return 0;
}