--- tools/tiff2pdf.c +++ tools/tiff2pdf.c @@ -3668,7 +3668,7 @@ written += TIFFWriteFile(output, (tdata_t) "(", 1); for (i=0;i<len;i++){ if((pdfstr[i]&0x80) || (pdfstr[i]==127) || (pdfstr[i]<32)){ - sprintf(buffer, "\\%.3o", pdfstr[i]); + sprintf(buffer, "\\%.3o", (unsigned char)(pdfstr[i])); written += TIFFWriteFile(output, (tdata_t) buffer, 4); } else { switch (pdfstr[i]){