GB1096376A - Improvements in or relating to photographic reproduction - Google Patents
Improvements in or relating to photographic reproductionInfo
- Publication number
- GB1096376A GB1096376A GB40081/65A GB4008165A GB1096376A GB 1096376 A GB1096376 A GB 1096376A GB 40081/65 A GB40081/65 A GB 40081/65A GB 4008165 A GB4008165 A GB 4008165A GB 1096376 A GB1096376 A GB 1096376A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- detail
- signal
- details
- colour
- 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
- 238000000926 separation method Methods 0.000 abstract 8
- 230000007935 neutral effect Effects 0.000 abstract 5
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000001429 visible spectrum Methods 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
1,096,376. Copying in colour by scanning. D. J. KYTE. Sept. 6, 1966 [Sept. 20, 1965], No. 40081/65. Heading H4F. Apparatus for improving the sharpness i.e. contract, of colour separation images produced from coloured originals comprises photo-electric sharp scanning equipment and associated colour separation equipment for producing electrical colour separation signals e.g. yellow (Y), magenta (M) and cyan (C) signals, photoelectric unsharp scanning equipment for producing electrical " white " (W) signals, means for determining a first and a second difference (if any) between the maximum individual signal amplitude occurring among the Y, M, C and W signals and the Y, M and C signals and between the minimum individual signal amplitude occurring among the Y, M, C and W signals and the Y, M and C signals respectively, and means for adding the sum of the first and second differences, referred to as a detail contrast signal, to each of the colour separation signals to form the signals to be used in the production of the colour separation images. A black printer separation signal (B) is also produced to which is added the sum of the first and second differences. The Specification discusses with reference to Figs. 3A-3P (not shown) the manner in which the detail contrast signal improves the contrast of neutral details (greys) and of boundaries between neutral and coloured areas without substantially affecting the coloured details themselves. When the detail contrast signal is used to produce the black printer separation (the visual effect on the printed result being more noticeable for this separation) (a) where a grey detail stands against a light neutral background, the grey detail is made darker whilst the background adjacent to the detail is made lighter; (b) where a grey detail stands against a dark neutral background, the grey detail is made lighter whilst the background adjacent to the detail is made darker; (c) where coloured details stand against a lighter background, the background adjacent to the details is made lighter; and (d) where coloured details stand against a dark background, the background adjacent to the details is made darker. In the embodiment described, Fig. 1, the unsharp scanning equipment which produces the W signal comprises partially reflecting surface 25, filter 26, photo-cell 27, amplifier 28 and circuit 29, Figs. 2 and 4, not shown, which includes maximum and minimum selectors, subtracters and an adder for producing the detail contrast signal. Photo-cell 27 receives light from a larger element of the transparency than photo-cells 14, 15, 16 by arranging for the image of the illuminated transparency 1 on aperture plate 6 to be larger than the aperture. Filter 26 ensures that the sensitivity of photocell 27 is equal in the three regions of the visible spectrum to that defined by the blue, green and red colour filters 11, 12 and 13, in combination with the photocathodes of photo-cells 14, 15 and 16. Circuit 29 includes two potentiometers which are used to adjust the amplitudes of the two differences and thus affect independently dark details on light backgrounds and light details on dark backgrounds. When scanning a broad area of colour, one of the Y, M and C signals will be greater than the W signal and one or other will be less than the W signal and thus any noise will cancel in the subtraction circuits. When scanning large neutral areas, however, the Y, M, C and W signals are all equal and thus any noise signals present will not necessarily be cancelled. These noise signals may be eliminated by introducing threshold values in the maximum and minimum selector circuits for the signals Y, M, C and W so that the W signal is only selected if it is greater than either the Y, M, or C signals by a certain amount in the maximum selector and less than the Y, M or C signals by a certain amount in the minimum selector. The value of the threshold is preferably chosen to be greater than the peak noise voltage expected on the W signal plus the peak noise voltage expected on the Y, M or C signals.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB40081/65A GB1096376A (en) | 1965-09-20 | 1965-09-20 | Improvements in or relating to photographic reproduction |
US579298A US3450830A (en) | 1965-09-20 | 1966-09-14 | Photographic reproduction employing both sharp and unsharp masking |
NL6613084A NL6613084A (en) | 1965-09-20 | 1966-09-16 | |
DE19661522502 DE1522502A1 (en) | 1965-09-20 | 1966-09-17 | Arrangement for generating color separation images from colored originals |
FR76815A FR1500276A (en) | 1965-09-20 | 1966-09-19 | Device to obscure blurry images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB40081/65A GB1096376A (en) | 1965-09-20 | 1965-09-20 | Improvements in or relating to photographic reproduction |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1096376A true GB1096376A (en) | 1967-12-29 |
Family
ID=10413095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB40081/65A Expired GB1096376A (en) | 1965-09-20 | 1965-09-20 | Improvements in or relating to photographic reproduction |
Country Status (5)
Country | Link |
---|---|
US (1) | US3450830A (en) |
DE (1) | DE1522502A1 (en) |
FR (1) | FR1500276A (en) |
GB (1) | GB1096376A (en) |
NL (1) | NL6613084A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2162716A (en) * | 1984-06-14 | 1986-02-05 | Canon Kk | Color facsimile |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1909292C3 (en) * | 1969-02-25 | 1974-03-07 | Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel | Process for reproducing multicolored original images |
GB1422341A (en) * | 1972-04-27 | 1976-01-28 | ||
US4005475A (en) * | 1972-06-02 | 1977-01-25 | Dr. -Ing. Rudolf Hell Gmbh | Method for improving sharpness when recording half-tone pictures by modulating a sharpness signal |
US4054916A (en) * | 1972-06-02 | 1977-10-18 | Dr. -Ing. Rudolf Hell Gmbh | Apparatus for improving sharpness when recording continuous-tone pictures |
US4097892A (en) * | 1976-10-08 | 1978-06-27 | Balding George H | Video color film analyzer |
JPS5498121A (en) * | 1978-01-20 | 1979-08-02 | Hitachi Denshi Ltd | Color correcting unit |
JPS55146451A (en) * | 1979-05-02 | 1980-11-14 | Dainippon Screen Mfg Co Ltd | Sharpness emphasis method in image scanning recorder |
US4264921A (en) * | 1979-06-29 | 1981-04-28 | International Business Machines Corporation | Apparatus for color or panchromatic imaging |
US4403258A (en) * | 1980-11-07 | 1983-09-06 | Ringier & Co., Ag. | Method and device for sequentially imaging an original |
JPS59205876A (en) * | 1983-05-10 | 1984-11-21 | Canon Inc | Method and apparatus for processing color picture |
US5678715A (en) * | 1993-05-21 | 1997-10-21 | Stoughton Composites, Inc. | Composite stacking frame assembly for shipping container |
US9067729B2 (en) | 2005-09-02 | 2015-06-30 | Sti Holdings, Inc. | Compartmentalized stacking posts and container with compartmentalized stacking posts |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2981792A (en) * | 1957-10-31 | 1961-04-25 | Fairchild Camera Instr Co | Color correction computer for engraving machines |
NL250892A (en) * | 1959-04-29 | |||
GB934108A (en) * | 1960-02-03 | 1963-08-14 | Crosfield Electronics Ltd | Improvements in or relating to colour reproduction |
-
1965
- 1965-09-20 GB GB40081/65A patent/GB1096376A/en not_active Expired
-
1966
- 1966-09-14 US US579298A patent/US3450830A/en not_active Expired - Lifetime
- 1966-09-16 NL NL6613084A patent/NL6613084A/xx unknown
- 1966-09-17 DE DE19661522502 patent/DE1522502A1/en active Pending
- 1966-09-19 FR FR76815A patent/FR1500276A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2162716A (en) * | 1984-06-14 | 1986-02-05 | Canon Kk | Color facsimile |
US4700399A (en) * | 1984-06-14 | 1987-10-13 | Canon Kabushiki Kaisha | Color image processing apparatus |
Also Published As
Publication number | Publication date |
---|---|
NL6613084A (en) | 1967-03-21 |
FR1500276A (en) | 1967-11-03 |
US3450830A (en) | 1969-06-17 |
DE1522502A1 (en) | 1969-09-18 |
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