Script to convert PDF and other formats to TIFF-F

I would like to have a piece of software designed (preferably written in PHP, but Perl would also be acceptable) that will run on a Linux web server (Apache 2.2, PHP 5.2.x, MySQL 5.x) and convert various user uploaded files into TIFF-F (Internet fax format) and return the converted file to the user in whatever is easiest to code (return the file immediately via download to user OR email to an email address). The file formats I need supported are jpg, png, txt and pdf. Of course if more formats can be supported, all the better. ## Deliverables Absolute requirements: 1) The code works on LAMP servers (mine happens to be CentOS 4.x with cPanel and Apache 2.2, PHP 5.2.x, Perl 5.8.8 and MySQL 5.x) and must work with PHP register_globals turned OFF. 2) The program must be able to convert at least jpeg, png, plain text and pdf files to multi-page TIFF-F files suitable for Internet faxing. 3) The program must return the converted TIFF-F file to the user via some simple mechanism (either immediately returned via download to the user or emailing the converted document to an email address the user specifies). 4) Once done converting the files, the program should delete the original and converted content so it doesn't clog up the server. 5) The program must be able to handle files of at least 5 MB in size and ideally be able to handle much larger files (I'll do my best to make sure the server environment doesn't get in your way in this regard). 6) The program should keep a log work done and results including: file name of file converted, email address converted file is sent to and any errors (wrong file type, conversion failed and why it failed if possible, email send failed and why, etc.). 7) If the converted file is emailed, then the program needs to make sure that the email address is in a valid format and should only accept a single email address. I'd be willing to only let the user select a few possible email addresses from a drop-down list if that makes things safer. 8) The program should inform the user what it is doing (uploading, converting, emailing, etc.) and let the user know the result (conversion successful, conversion failed because..., email successful, email failed because..., etc.) Nice to have, but not required: 1) Support for additional file formats to convert to TIFF-F for Internet faxing, for example: .doc, .rtf, .gif, .docx, .ppt, .pptx, .pict, .bmp, etc. 2) The ability to allow the user to upload more than one file at a time to have all the files converted to a single multi-page TIFF-F file. Important notes: 1) This is not going to be a commercial product, just one used by me a few other key people. Therefore, this product can use GPLed or other open source code as needed. For example, using ImageMagick, NetPBM, GD or ghostscript is fine. 2) The program is going to be secured behind standard Apache page password protection so even though the script will run on a public server, the code itself will be only for private use. 3) Even though access to this program will be restricted, I would appreciate code that is reasonably secure. Please make sure all input is sanitized to avoid xss and other security risks. I'm not looking for independent code verification, just reasonably clean, well-written code.