Tone control method for thermal transfer type color printer

Details Tone control method for thermal transfer type color printer Tone control method for thermal transfer type color printer

1995-01-17

1996-12-17

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Gradational recording

358298, B41J 236

Patent

active

055858333

ABSTRACT:
For tone control of a thermal transfer type color printer, an image data of red (R), green (G) and blue (B) is converted by a color conversion circuit into an image data of yellow (Y), magenta (M) and cyan (C). The respective 8-bit Y, M and C image data from the color conversion circuit are converted to 12-bit image data by a look-up table. A converter circuit divides 256 tone levels represented by the upper 8 bits of the 12-bit image data as an integer portion and the lower 4 bits thereof as a decimal portion to a first region whose tone level is equal to or lower than a predetermined tone level and a second region whose tone level is equal to or higher than the predetermined tone level. In the first region, a multilevel area tone is performed by using all of the 12 bits with a plurality of dots in both a main scan direction and a sub-scan direction as one block and, in the second region tone, a multivalue area tone using only the lower 4 bits and usual density tone using the remaining dots are used in combination. With this scheme, it is possible to realize a thermal transfer color printer which can improve S/N ratio in low tone and improve the color reproducibility.

REFERENCES:
patent: 4691211 (1987-09-01), Brownstein

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