Image processing method with improved digital airbrush touch up

Details Image processing method with improved digital airbrush touch up Image processing method with improved digital airbrush touch up

1984-12-24

1988-06-14

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340723, 340703, G09B 116

Patent

active

047515031

ABSTRACT:
The present invention is a technique for changing the contrast in a limited area of a digital image having a plurality of pixels of differing tone levels and at the same time maintaining a constant average level intensity of the pixels within the limited area by isolating a portion of the pixels and selectively altering the contrast of tone levels between pixels.

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patent: 4103330 (1978-07-01), Thacker
patent: 4103331 (1978-07-01), Thacker
patent: 4148098 (1979-04-01), McCreight et al.
patent: 4317956 (1984-03-01), Torok
patent: 4345313 (1984-08-01), Knox
patent: 4438453 (1984-03-01), Alston
patent: 4514818 (1985-04-01), Walker

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