Pencil draw on html5-canvas

Requirement in a quick glance. User can draw on the input-image as if the user is using a pencil. The user can also erase whatever he has drawn with the pencil using an eraser. [Please see the attached document for detail with images] To develop this app, you may use html-5 canvas and javascript on asp.net platform. Requirement in detail: Given an input-image[1] and an overlay-image[2]. User can draw[3] on the input-image as if the user is using a pencil[4]. The user can also erase whatever he has drawn with the pencil using an eraser[5]. The actual drawings and erasing happens only on the overlay-image, but for user it looks like he is drawing on the input-image. Finally, the user clicks 'next' button and the new png image from overlay-image is posted to asp.net page using asynchronous POST method. [1] The input image can be of any size with the range of 200x200px to 2000x2000px. This image will be in jpeg format. [2] Overlay-image is of the same size of input image. Overlay-image is similar to the layer concept in photoshop. the Overlay-image will be 8-bit png image and always black & white image. [3] Draw in single color of Purple. Color picker not needed. [4]The pencil size can be change between 1 to 100. [5]The eraser size also can be changed as much as the pencil Important requirement: 1)The image have to be responsive to the html container. The image needs to take the width of the <div> with a given 'id', where it is suppose to be displayed. It need to work well with bootstrap. 2)It should work in mobile phones with android and IOS. Tool need to be used: Visual studio 2013 Your bid will be split into 4 milestones of equal size and following is the project execution steps. 1) First milestone will be escrowed as soon as project is accepted by you. 2) You develop the application, obfuscate the javascripts and deliver. 3) If this meets most of the requirement, I will release the first milestone and escrow the second. 4) After all the requirements met, you release the final version with open source code. I will release the second milestone and escrow the third. 5) Your code will be thoroughly tested by me for two weeks. You fix the bugs and compatibility issues during this period. I will release the third milestone and escrow the fourth. 6) Your code goes in the main website and will be used by users. Any bugs or issues occurs within a time frame of 2 months will be fix by you. At the end of two months, the fourth escrow will be released. Thanks for reading till the end. To filter out the spammers (sorry) please write "Awake" in your bid. Happy bidding