Scanning pictures and uploading them to Google Photos is a great way to digitize your collection. With unlimited high-quality storage and text recognition capabilities, it's hard to pass up.
Unfortunately, the colorization feature is not available yet.
Mashable called Google out about it .
The first thing I said at Google I / O 2018. After a year of radio silence in May 2019, Mashable called Google out about it .  David Lieb apologized and said the feature was silent in the works.
Love even went on to showcase a demo of the on a photo of his grandmother. From the looks of it, the feature wants to be dead-simple to use: just tap the edit button while viewing a photo, then one of the filter options will be "Colorize."
There is no better way to express yourself. It wants to be a beta feature at first, indicated by a tooltip that reads "Add color to old photos (BETA)." Googlers-only version of the app.