Image forming apparatus and gradation output adjusting method in

Details Image forming apparatus and gradation output adjusting method in Image forming apparatus and gradation output adjusting method in

1994-11-29

1998-05-19

Coles, Sr., Edward L.

Image analysis

Color image processing

Color correction

358504, 358521, 358518, 382162, H04N 146, G03F 308, G06K 900

Patent

active

057546835

ABSTRACT:
In a gradation output adjusting method according to the present invention, a gradation correcting section 64 corrects a gradation value of input data in accordance with a predetermined gradation correcting curve and applies the data after the correction to a printer output section 66. In preparing a gradation correcting curve, test data for forming a gradation scale is inputted to the printer output section 66 from a CPU 70. An image corresponding to the test data is read by a scanner section 1. A proper gradation value to be applied to the printer output section 66 is found with respect to some gradation values of the input data on the basis of the result of the reading. A pre-gradation correcting curve is prepared on the basis of the proper gradation value. The pre-gradation correcting curve and a plurality of types of curve patterns previously stored in a ROM 72 are matched. A curve pattern which is best matched to the pre-gradation correcting curve is set as a detailed gradation correcting curve. Since the pre-gradation correcting curve and the curve pattern are matched to set the gradation correcting curve, therefore, the amount of operation may be small and processing time is reduced.

REFERENCES:
patent: 4751377 (1988-06-01), Ishizaka et al.
patent: 4791678 (1988-12-01), Iwase
patent: 4959669 (1990-09-01), Haneda et al.
patent: 5461462 (1995-10-01), Nakane et al.

Affiliated with

Also associated with

Rating

Image forming apparatus and gradation output adjusting method in does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image forming apparatus and gradation output adjusting method in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image forming apparatus and gradation output adjusting method in will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1861536