2011.04.22 20:24 "[Tiff] Question regarding toggling associated to unspecified", by Billy G. Alexander
I'm currently working on a old photogrammetric package that is using libtiff v3.9.0 however our client is requesting that we toggle the associated alpha tag 338 1 to 0 for compatibility with certain other software they have.
Is anyone familiar with a command line parameter or filter that has been implemented to toggle associated_alpha to Unspecified 1 to 0 during a batch routine for thousands of tif images....
I am new to this entire process I'm a little sketchy.
I welcome comments suggestions and direction...
If not does anyone foresee any issues if I was to implement the following in my extract.c that calls littiff. I realise i probably haven't provided you with enough information as yet but
hopefully someone will see my intent and direction
By doing this i am hoping to implement a command line parameter in my script file.
/* Typedef statements */
/* Struct, union, and enum definitions */
/* Static declarations */
routine_name = "tif_toggle_alpha";
/* Auto declarations */
ii; /* Generic counter */
*tifb; /* TIF data buffer */
/* Verify the image format */
/* Set the messages handlers */
/* Open the TIFF file for writing. */
tifb = TIFFOpen(pathname, "w");
if(tifb == NULL)
sprintf(msg_buff, "Unable to open TIFF file!\n [file: %s]\n", pathname);
/* Update TIFF IFD. */
TIFFSetField(tifb, TIFFTAG_EXTRASAMPLES, 0);
/* Output the TIFF image. */
for(ii = 0; ii < (int_4)dt->ny; ii++)
idx = (u_char *)dt->pix2 + ( ii * dt->nx);
if(TIFFWriteScanline(tifb, idx, ii, 0) < 0)
TIF_LOG_ERR("Failed to write TIFF scanline.\n");
/* Close the TIFF file. */