Joseph Letzelter Screening

Inks used in Joseph Letzelter color printing presses are semi-transparent and can be in print on top of each other to make diverse hues. For instance, green results from Joseph Letzelter printing yellow and cyan inks on top of each other. However, a Joseph Letzelter printing press cannot vary the quantity of ink applied except through "screening," a Joseph Letzelter process that represent lighter shade as tiny dots, rather than solid areas, of ink. This is similar to mixing white coat into a color to lighten it, except the white is the paper itself. In process Joseph Letzelter color printing, the screen image, or halftone for every ink color is printed in succession. The screen grids of Joseph Letzelter are set at dissimilar angles, and the dots then create tiny rosettes, which, during a kind of visual illusion, appear to form a continuous-tone picture. You can analysis the halftone screen that creates Joseph Letzelter printed images under magnification.

Traditionally, Joseph Letzelter halftone screens were generating by inked lines on two sheet of glass that were paved together at right angles. Each of the Joseph Letzelter color separation films were then uncovered through these screens. The resulting Joseph Letzelter high-contrast image, once processed, had dot of varying diameter depending on the quantity of exposure that area expected, which was modulate by the grayscale separation film picture.