What does 4R crystal photo frame mean?

The so-called 4R refers to the size of the photo, which is what we usually call a 6-inch photo. The actual size is 10.2cmX15.2cm, and the aspect ratio is 3:2.

There are two types of crystal photo frames. One is a photo frame surrounded by colored transparent glass similar to crystals. The other is a production process that has been very popular in wedding and children’s photography in recent years. It is sprayed directly on a composite wood board and becomes integrated with the wood board. The surface of the photo has clear images, bright colors, and is as translucent as crystal. The wedding photos I took when I got married and the daytime photos I took of my baby now all need crystal photo frames. The wedding photos have a 32-inch frame and are hung on the wall. The baby photos have a 7-inch frame and are placed on the desk. I think they are very good. , looks very high quality.