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### imread doesn't open pbm/tiff images

Hi, I have a code that works with low dynamic range images (like png, jpeg and other normal extensions), but it can't read pbm/tiff files. What can I do?

cv::Mat img = cv::imread(argv[1], CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);

if (img.rows*img.cols==0){
printf("\nImage not acquired.");
return 0;
}


..of course, if I load one of those kind of images, it returns 0. I've already asked on stackoverflow but nobody answerd me. I'm getting crazy.