When you open an image, Tintii Photo Filter will analyze it and process all the colors that it contains. You will see the photograph in black and white, and on one side a series of buttons that will represent the different colors in the image. If you want to maintain red, you'll have to press the button that corresponds to that color, and you'll automatically see the photo in black and white with red elements. If you like what it looks like once this is done, all you have to do is save it, and you'll have applied the effect.
But if, on the contrary, you aren't satisfied, you will be able to try out other options and modify some settings, like the channel mixer and the post-processing.
Download Tintii Photo Filter for free and apply this original effect to your photos that will provide them with a special touch.