Here are some free and open source tools you can use to restore old pictures with degrading color and artifacts or scratches, especially those with human faces on them:

* **GIMP:** GIMP is a powerful raster graphics editor that can be used for a variety of image editing tasks, including photo restoration. It has a wide range of tools for repairing and enhancing images, including the ability to remove scratches, tears, and other artifacts, as well as to adjust the color and contrast of images.
* **Photoshop Elements:** Photoshop Elements is a simplified version of Adobe Photoshop that is designed for home users. It includes a number of tools for photo restoration, such as the Healing Brush, Clone Stamp Tool, and Spot Healing Brush.
* **Paint.NET:** Paint.NET is a free and open source image editing software that is similar to Microsoft Paint. It has a number of tools for photo restoration, such as the Clone Stamp Tool, the Healing Brush Tool, and the Sharpen Tool.
* **Remini:** Remini is an online AI photo restoration tool that can be used to restore old photos with degraded color and artifacts. It is especially effective at restoring photos of human faces.
* **GFP-GAN:** GFP-GAN is a free and open source AI photo restoration tool that can be used to restore old photos with degraded color and artifacts. It is especially effective at restoring photos of human faces.

These are just a few of the free and open source tools that you can use to restore old pictures. The best tool for you will depend on your specific needs and preferences.
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