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"only one image is recorded"

the problem is here:

sprintf(file,"%d%d%d_%d%d%d.pgm\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);

it has a minimum resolution of 1 second, so all images taken in that timespan get saved under the same name.

so, either

1. add the clock() time:

   sprintf(file,"%d%d%d_%d%d%d_%d.pgm\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec, clock() );

2. or maybe a counter:

   // somwhere out of the loop

   int counter = 0;

   // in the loop:

   sprintf(file,"%d%d%d_%d%d%d.pgm\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec, counter);
   counter++;