The store will not work correctly in the case when cookies are disabled.
We use cookies to make your experience better.
We use our own and third party cookies in order to differentiate your experience from that of other users, to analyze site usage and to show you personalized advertising based on a profile developed from your browsing habits. You can accept the use of all cookies, configure them according to your preferences or refuse them. Learn more.
Cookie settings
With this advanced configurator for our own and third-party cookies, we want you to be able to modify the parameters that influence you browsing our website at any time. Learn more.
Technical cookies (necessary)
These cookies allow the user to browse and use the different options and services, including those that allow the publisher to manage the website and the possibility of enabling its features and services.
These cookies allow for the monitoring and analysis of the behaviour of users of the websites to which they are linked. The information collected is used to measure the activity on the website in order to implement improvements based on the analysis of that information.
These cookies store information on user behaviour based on their browsing habits and can be used to build a specific profile in order to display advertising.
See advanced consent personalization
Enables cookie storage related to advertising.
Sets consent for sending user data related to advertising to third parties (Google).
Stochastic screen for polymer photogravure; also called aquatint screen. The stochastic screen is made up of tiny dots arranged randomly and under specific dot size and density parameters.
A fine stochastic screen must be used when we want print a photographic tonal scale with photopolymer solar plates. Avoid open bites in print and allows for a great variety in tone scales when working with continuous tone images.
We have 3 types of grain size and various formats. Some of the references or sizes may vary the delivery time, you can ask us before buying them. If you need a specific aquatint screen or size, please contact us.
The aquatint screen is essential needed to structure the polymer plate and achieve the reproduction of continuous tone images (with tonal scaling). Whether working with autographics image positives or with digital image positives, the use of a stochastic screen is necessary. The irregular grain of the aquatint screen is composed of randomly arranged microscopic dots that help the appearance of image tonal gradations. In short, the stochastic or aquatint screen positive helps us to take advantage of all those grays that would not appear otherwise. Also, avoid open bites and irregular white blotches in areas close to blacks.
In the jargon of printmakers it is known as aquatint screen by analogy to the chalcographic technique, where random dots of colofonian dusted resin are arranged on metal plates, accommodating the base for the construction of tonal images depending of acid work. In our case, the plot is exposed by means of a UV light unit on the polymer plates prior to the analog or digital positive.
In short, the stochastic raster positive is used to convert continuous-tone images to discontinuous-tone images. In this way, these types of images will be feasible to stamp with photopolymer plates.
Due to the demand of some customers, the Rittagraf technical team has generated 3 different types of aquatint screens. The three differ in the size of the plot point.
Heavy Dot Screen: 84 micron size dot
Medium Dot Screen: 40 micron size dot
Fine Dot Screen: 31 micron size dot
The screen greatly affects the final quality of our photopolymer plate. The tonal range that we can achieve in photogravure printing depends on the structure and layout of the plot. Without the use of a stochastic screen, our photo-etchings prints would be too contrasty, missing out on the wide tonal ranges that can be achieved with polymer. To learn more about the use and of this type of patterns in photopolymer plates, we recommend the most complete study and book of photogravure by our friend Ramón Freire: The graphic act as construction. Autographic positive and photopolymer plate (spanish language). Among others, we also recommend you: Polymer Photogravure, A new Method for Photographers and Graphic Artists, from Taneli Eskola and Kari Holopinen.
