The website Algorithmia offers free automatic colorization of black and white photos, online connection, using an automated algorithm.
If you have old black and white photos of your grandparents, then the Algorithmia website is worth a try. You will find a free, online service that uses an algorithm, capable of adding color to black and white images. The method of use is very easy. Paste a URL into the box or upload one picture, wait a while for the processing to complete and you will see the colored result.
The service displays a comparison image with half of the original black and white and the other half in color. Drag the vertical purple line to show more or less colored parts of it image, to see how it will look before you download it.
Edited images can be downloaded either as a comparative image or as a full color image. Both features will have a watermark on the lower right. Capturing the comparison image will display the image with the purple bar. Move the purple bar before downloading the benchmark to get the coverage you want. The default is half the original image and half the color image.
The service is not perfect and can produce some interesting and unusual results. Sometimes it takes some time to process the images, It can even reach 15 seconds. Although it always depends on your connection to Internet.
Overall results tend to be sepia - yellow, especially when the algorithm does not recognize something. Of course it's not a serious image coloring tool, such as what you will find in an advanced graphics program. There are no options to make adjustments to the colors or areas of the image, but it's a fun tool that will not get you tired and the results often look good.
There is an interesting note from Algorithmia, where it states that the service will color either side of the image or the other, depending on the program browser you are using. The programs περιήγησης που βασίζονται στο Firefox έχουν το χρωματισμένο αποτέλεσμα στην αριστερή πλευρά της εικόνας. Τα programs περιήγησης με βάση το Chromium δείχνουν τα αποτελέσματα των χρωμάτων της εικόνας στα δεξιά.
You can try out any of the five sample images to see how the service works before you pick up one of your own images.
Paint the photos with the Algorithm algorithm from here.