Black and white photographs certainly have their charm, but with the Colorize Images app there is a way to make them gain color. For this, the application has the help of machine learning and the photos that are transferred to the app.
First of all you have to choose an image from the gallery that you want to transform or select from platforms like Facebook, Twitter, Google Chrome or Google Photos. The app then uses a GPU server to color the image, with the source photo being sent over the network. The colored one and then "returns" to the equipment.
For best results, I advise that the images have good quality, good contrast and a good focus. If the photographs do not have these characteristics, the results may be more difficult to achieve, but you will always have the possibility to adjust some parameters in the app.
The application is free and available for iOS.