JPS55142344A - Color correcting device in digital color tone control - Google Patents

Color correcting device in digital color tone control

Info

Publication number
JPS55142344A
JPS55142344A JP4907979A JP4907979A JPS55142344A JP S55142344 A JPS55142344 A JP S55142344A JP 4907979 A JP4907979 A JP 4907979A JP 4907979 A JP4907979 A JP 4907979A JP S55142344 A JPS55142344 A JP S55142344A
Authority
JP
Japan
Prior art keywords
data
color
discriminating
gwl
gates
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.)
Granted
Application number
JP4907979A
Other languages
Japanese (ja)
Other versions
JPH0151827B2 (en
Inventor
Mitsuhiko Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dainippon Screen Manufacturing Co Ltd
Original Assignee
Dainippon Screen Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dainippon Screen Manufacturing Co Ltd filed Critical Dainippon Screen Manufacturing Co Ltd
Priority to JP4907979A priority Critical patent/JPS55142344A/en
Priority to IL59886A priority patent/IL59886A/en
Priority to GB8013060A priority patent/GB2050106B/en
Priority to DE19803015396 priority patent/DE3015396A1/en
Priority to US06/142,650 priority patent/US4335398A/en
Priority to FR8009157A priority patent/FR2455307A1/en
Publication of JPS55142344A publication Critical patent/JPS55142344A/en
Publication of JPH0151827B2 publication Critical patent/JPH0151827B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE: To realise easy and accurate color correction, by indexing the memory table on the basis of the color discrimination data to divide the hue region by mutual comparison and necessary computation of color data, and reading out correction data.
CONSTITUTION: Yellow, magenta and cyan color data Y2, M2, C2 of 8-bit or other plate making color digital signals by scanning of the original are compared in a coincidence detecting comparator parallel to the first color discriminating circuit 44, and magnitude comparators 52Y and 51Y, 52M and 51M, and 52C and 51C to generate rough color discriminating data gWl to divide the hue regions in six stages or so through OR gates 53YW53C, inverters 54YW54C, and AND gates 55W60. Upper digit 4-bit data Y2'... of data Y2... added to the second operating circuit 45 are processed in adding circuit 62 and others, thereby generating color discriminating data D. According to these data gWl and data D, when the memory is indexed, the color correcting data may be easily and accurately read out by digital processing without using switch elements or the like, so that the color may be corrected.
COPYRIGHT: (C)1980,JPO&Japio
JP4907979A 1979-04-23 1979-04-23 Color correcting device in digital color tone control Granted JPS55142344A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP4907979A JPS55142344A (en) 1979-04-23 1979-04-23 Color correcting device in digital color tone control
IL59886A IL59886A (en) 1979-04-23 1980-04-20 Digital color control method and machine
GB8013060A GB2050106B (en) 1979-04-23 1980-04-21 Digital colour control for colour picture reproduction
DE19803015396 DE3015396A1 (en) 1979-04-23 1980-04-22 METHOD AND DEVICE FOR DIGITAL CONTROL OF AN IMAGE COLOR
US06/142,650 US4335398A (en) 1979-04-23 1980-04-22 Digital color control method and machine
FR8009157A FR2455307A1 (en) 1979-04-23 1980-04-23 METHOD AND APPARATUS FOR NUMERICALLY CONTROLLING COLORS IN AN IMAGE REPRODUCING MACHINE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4907979A JPS55142344A (en) 1979-04-23 1979-04-23 Color correcting device in digital color tone control

Publications (2)

Publication Number Publication Date
JPS55142344A true JPS55142344A (en) 1980-11-06
JPH0151827B2 JPH0151827B2 (en) 1989-11-06

Family

ID=12821076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4907979A Granted JPS55142344A (en) 1979-04-23 1979-04-23 Color correcting device in digital color tone control

Country Status (1)

Country Link
JP (1) JPS55142344A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62263768A (en) * 1986-05-09 1987-11-16 Ricoh Co Ltd Chrominance signal converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62263768A (en) * 1986-05-09 1987-11-16 Ricoh Co Ltd Chrominance signal converter

Also Published As

Publication number Publication date
JPH0151827B2 (en) 1989-11-06

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