GB191215300A - Improvements in and relating to the Production of Photo Mechanical Printing-surfaces. - Google Patents
Improvements in and relating to the Production of Photo Mechanical Printing-surfaces.Info
- Publication number
- GB191215300A GB191215300A GB191215300DA GB191215300A GB 191215300 A GB191215300 A GB 191215300A GB 191215300D A GB191215300D A GB 191215300DA GB 191215300 A GB191215300 A GB 191215300A
- Authority
- GB
- United Kingdom
- Prior art keywords
- camera
- tone
- negative
- high lights
- taking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F5/00—Screening processes; Screens therefor
- G03F5/02—Screening processes; Screens therefor by projection methods
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Printing Methods (AREA)
Abstract
15,300. Gamble, E. H. July 1. Photo-mechanical printing-surfaces.-Relates to a method of producing half-tone negatives in which the printing dots in the high lights are wholly or partly obliterated. A similar method is described in Specification 6768/12 for colour photography. Adjacent to the camera for taking the half-tone negative is a second camera in which an ordinary negative is taken, from which a positive transparency is made. In taking the half-tone negative, a supplementary exposure is made during which the positive is accurately replaced in the adjacent camera and projected on to the object, thereby illuminating intensely the high lights while keeping the dark parts in shadow. If it is required to obliterate entirely the effect of the screen in the high lights, the supplementary exposure is given with the screen removed and the room darkened.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB191215300T | 1912-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB191215300A true GB191215300A (en) | 1913-06-05 |
Family
ID=32800477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB191215300D Expired GB191215300A (en) | 1912-07-01 | 1912-07-01 | Improvements in and relating to the Production of Photo Mechanical Printing-surfaces. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB191215300A (en) |
-
1912
- 1912-07-01 GB GB191215300D patent/GB191215300A/en not_active Expired
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