In the following pages, all the steps for the preparation of the films, printing matrices for collotype prints, and many other details are explained.
We shall consider that collotype on glass is the most practical. It ensues from simple observations which we can doing during visit of studios still […]
The réticulation occurs all the times when the gelatin, inflated by the water, until occupy a volume upper to the one that it occupied during […]
Digital negative : Negatives for collotype can be realized from digital images by printing ink jet on transparent film, without quality loss to compared with […]
Densitometric balance of films : Ideally, the densitometric balance of negatives for collotype is situated in an interval of densities included between 1,00 and 1,20. It […]
The retouch of films is not compulsory. It intervenes for particular works or when we want to obtain certain effects on the images. Film silhouetting […]
From a workshop to the other one, the reference density of negatives (I indicate here between 1,10 and 1,20) can vary. This is of in […]
PURPOSE (concern argentic negatives) : to clear up the blacks of the movie to give of the detail in the clear parts of the image […]
The main rule concerning the photographic negatives is that should have a well-balanced contrast, of a density situated 1,00 and 1,10. This value is identical […]
There are several grades of photographic gelatins : In a past still close enough, it seems that there was a range of hardness of this […]
It’s about an operation there, which, without being difficult also has its importance for the obtaining of a good result. The purpose to be reached […]
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