C/C++/PHP Diagram to Data Image Parser

The project consists of a Diagram to datas Image parser which extracts x/y data pairs from a given gif/jpg image behind a certain Web Url with data point markers of a fixed color and axis descriptors for the values to extract. The script should be programmed in C, C++ or PHP and run under Linux on a webserver from a cron job, the returned data should be ideally in a data file containing the data pair values for each point in the diagram. The script should be able to handle day series as well as hour series. Example for script parameters: img_parser [ImgUrl] [SeriesMode] [OutFile] Source code should be made available. Example images: [login to view URL] [login to view URL]