Program/app design for a photo with text layover

App specification - SeeRead An app with which you take a photo (preferably tablet, secondary phone). Upon having taken the photo, the app allows you to press anywhere on the photo. This will leave a marker (coloured dot), which will expand into a text field once yo release the touch. In the text field you can type any kind of text. Once the text has been typed, the text field is closed by tapping next to it. When this is done, the text is saved in the text field (represented by the coloured dot). You can add as many text fields (each shown by a dot of the same colour). Once you're done adding text field and text you can save this as a file (no idea which format suits it) and you can email it to another person, that can then open the photo and tap the dots to expand them into a text field, which he or she then can read. If this secondary user has more to add, he/she can add text fields represented by a dot of a different colour than the primary user. At least 5 users (colours) must be supported. Text fields must, apart from the text input from users, contain who put it there (username, possibly taken from phone/tablet) and the date and time. Dots must be partially see through (in order not to hide important details), but still distinct enough for users to clearly spot them. When pressing a dot to show the text, the text must always be shown on the photo, as far from the dot as possible (within the limits of the photo).