Photogelatin process and Planography

Photogelatin process noun - A photomechanical printing process that uses a glass plate with a gelatin surface that carries the image to be reproduced; can be used with one or more colors.

Planography and photogelatin process are semantically related. In some cases you can use "Planography" instead a noun phrase "Photogelatin process".

Planography noun - The process of printing from a surface on which the printing areas are not raised but are ink-receptive (as opposed to ink repellent).

Photogelatin process and planography are semantically related. Sometimes you can replace phrase "Photogelatin process" with "Planography", this terms are similar.