There are several tools available that can convert black and white or grayscale images to full color without compromising quality or increasing file size. One such tool is DeOldify, an AI-based software that uses deep learning algorithms to add color to old black and white photos. It uses a model trained on a large dataset of colored images to predict the most likely colors for each pixel in a grayscale image. Another tool is Let's Enhance, an online service that uses AI to upscale and add color to images. It can increase the resolution of an image by up to 16 times without losing quality, and its colorization feature uses a pre-trained model to add realistic colors to grayscale images.
Another tool that can colorize grayscale images is Algorithmia's Colorize Photos API. This cloud-based service uses a deep learning model to add color to black and white images. It can handle a wide range of image formats and sizes, and its API makes it easy to integrate with other applications. Another option is Colourise.sg, an online tool that uses a pre-trained deep learning model to colorize grayscale images. It can handle a wide range of image types and sizes, and its user-friendly interface makes it easy to use. Finally, there's Colorizer, a free and open-source tool that uses a combination of machine learning and manual color mapping to add color to grayscale images. It offers a high degree of control over the colorization process, allowing users to fine-tune the results to their liking.