Build me a software

Hi, This is Hinal Shah from Collateral Medical Pvt Ltd. CollateralMedical is an online medical device store company in Indian medical device industry which supplies all kinds of medical equipment for home, hospital, health, surgical, retail, physician, medical office and many more medical supplies store. We serve our customers through direct mail, industry-specialized support staff, field sales representatives and use of internet and mobile technologies. We sell medical supplies at very low and reasonable cost with best sale price available at [login to view URL] or [login to view URL] . Our Products Services are available to american medical supply store and others continental surgical store too. I want a freelancer to build me software for my foot pressure device. 1. It should not have system dependency, it should support both Windows and mac. 2. Which language code will be used to design the software? 3. How much time would it take to develop the software? Overview of the device: I have a grayscale image of the foot on A4 size paper. The A4 size paper will be scanned using a scanner. The selected scanner will scan the image and preview it on the laptop/desktop. The given scan image data then needs to be showed on the laptop/Desktop in RGB scale. So the Grayscale image and the RGB scale image will be showed side by side on the screen.