Easy tool web color change

Hello, i want a tool that converts black and white JPG images into images with two different colors of your choice. This tool must work the same way as another present in a website whose address is in the attached file ([login to view URL]); i'm not the owner of that website. It is preferable to use the same operative process of the color change of this reference website, while for the layout there are some descriptive images in the attached files inside the "layout example" folder. On this website you can load any JPG image, usually in black and white, and change them with two colors of your choice. Afterwards it is possible to download the image file with the colors changed and the resolution and size remains the same as the image loaded previously. For example, if the loaded image has 300dpi, 2400x3000 pixel, is sRGB and have about 3Mb, after the color change it will be returned to the public with the same features and only the Megabytes will be changed slightly. The operation of color change must be the main issue, it must be quick and efficient, for this I have provided you with a reference website to know how it has to work, especially in terms of speed of execution. I provide images for the tests you will find in the "images for test" folder. In the zip file you will find the layout of how my new site should appear, you will find it in the "layout example" folder; it is indicative to understand how to place the buttons and the window where the initial demo image and the ones loaded later are displayed. I have provided you with some elements that you find in the "layout elements" folder, including the information text on the use, which can be activated with the single switch button. Note: - to upload the image file you need to do the Login, with unique password to everyone, I do not care that users have their own account. After logging in with a password, the "select JPG" button will appear about in the same position. - Indexing and ranking on search engines is NOT required. To clarify, the JPG files that will be loaded in the tool will then be destined for printing, so they will all be with 300dpi and sRGB color space (which is different from RGB color mode that only serves for video images) so it is important that they remain with such features. I send an example image of how it will appear in the details of the image ([login to view URL]). It is also important that it is quite efficient and fast in the color change process: - the times of the process will be compared to the website that I put as a reference, must have about the same timing and not be 2 or 3 times slower. - the file size after the color change process must not differ much from the loaded JPG file; for example, if the JPG is 3MB after the color change will be about 3MB and in any case not much higher, always compare it with the reference website. To verify the correct operation of the tool you can use your hosting to which I will access and I will do the tests. The work will be considered totally finished after installation on providers and verification that everything is correct. For any questions I am available. Thanks, Alex