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And of course any image that contain a regularly patterned series of dots is not a photograph at all but a ink printed image.

Early real photo postcards are small by their very nature and since most were contact printed, not enlarged, there is no visible texture.In printed images the grey areas are usually made up of black marks that are spaced to create the optical illusion of greys.Though most of us today are familiar with the concept of photo grain, this is mostly because we have experienced very large prints made from small 35mm negatives.This too is not foolproof for many publishers had large stocks of photo papers using them for decades after they stopped being manufactured.NOTE: There were many other photo papers manufactured in addition to those listed on this page, and even these could be made in different finishes from matte to glossy.