Digitization System for Film Negatives and Slides (II)

The last post, Digitization System for Film Negatives and Slides (I), was dedicated to comment the oportunity to use a former photographic enlarger head as a part of a film digitization system by means of a digital camera. This second post comments aspects related with the illumination eveness in the diffusser supporting the negatives or …

Digitization System for Film Negatives and Slides (I)

lass Digitization of film negatives and color slides can be done by means of scanners or digital cameras. This post will show a reproduction station with digital camera derived from a former darkroom enlarger. The original device was an LPL enlarger of 4x5” (10x12.5cm) maximum format. The enlarger head is equipped with a diffusion box …

Heliogravure IV – Some Overall Thoughts

Heliogravure has some particular characteristics that don't facilitates the system calibration in order to arrive to a sort of WYSIWYG. Working from a film negative, it is a different experience if the user prints the negative on photographic paper before to perform the heliogravure or passes directly to the heliogravure. In the first option, what …

First Heliogravure Print

After some troubles and a quantity of trials with Grayscale step wedges, here is my first Heliogravure image. The plate measures 145x165mm and the image 120x120mm. I have used an stochastic screen digitally designed and printed on high contrast photographic film in a Pre-press service bureau. The digital image was edited in Adobe Photoshop and …

Heliogravure III – Ultraviolet Light with Digital Screen

Updated 26/01/2016 Hardening the gelatin. In heliogravure, it is necessary an illumination source rich in ultraviolet (UV) light. This UV light must provoke the cross link reaction into the gelatin previously sensitized with potassium bichromate (K2Cr2O7). This reaction is explained by several and sometimes slightly different theories. Luis Hernández (2), explains that the UV light …