Abstract: Computer-based, anti-clipping, pre-printing, color-image correction via virtual color-parameter controllers that are provided within the graphic user interface of a print driver. Parameters accommodated include Red, Green and Blue offset, Lightness offset, Gamma and Chroma. Chroma modifications are handled preliminarily by a special mathematical matrix. Matrix-processed Chroma values are then co-processed with other parameter modifications within an anti-clipping, hyperbolic-tangent-function (asymptotic-like) algorithm which implements an asymptotic-like approach toward creating final pixel modification values that avoid range-limit color and/or tone-scale clipping. Final pixel values are drawn from three one-dimensional look-up tables, one for each of the three colors.

Abstract: Computer-based, anti-clipping, pre-printing, color-image correction via virtual color-parameter controllers that are provided within the graphic user interface of a print drier. Parameters accommodated include Red, Green and Blue offset, Lightness offset, Gamma and Chroma. Chroma modifications are handled preliminarily by a special mathematical matrix. In one embodiment of the invention, matrix-processed Chroma values are directly inserted into an algorithm, and are then co-processed with other parameter modifications within an anti-clipping, hyperbolic-tangent-function (asymptotic-like) algorithm which implements an asymptotic-like approach toward creating final pixel modification values that avoid range-limit color and/or tone-scale clipping. In another embodiment of the invention, matrix-processed Chroma values are additionally inserted in to such an algorithm as components of a pair of like cubic terms. These cubic terms function to enhance asymptotic behavior of the algorithm in certain situations.

Abstract: A system and methodology for removing JPEG-compression artifacts from color images, wherein a first-stage examination of the image takes place to determine, in accordance with several approaches, whether artifact removal is appropriate for the image. Following such examination and characterization, when an image is determined to be a candidate for artifact removal, pixel blocks in the image are examined so that they can be characterized as uniform, busy or transitional, and from these characterizations, appropriate filters, or no filter at all, are employed to prepare such pixels for insertion into a final artifact-removed output color image.

Abstract: Computer-based, anti-clipping, pre-printing, color-image correction via virtual color-parameter controllers that are provided within the graphic user interface of a print drier. Parameters accommodated include Red, Green and Blue offset, Lightness offset, Gamma and Chroma. Chroma modifications are handled preliminarily by a special mathematical matrix. In one embodiment of the invention, matrix-processed Chroma values are directly inserted into an algorithm, and are then co-processed with other parameter modifications within an anti-clipping, hyperbolic-tangent-function (asymptotic-like) algorithm which implements an asymptotic-like approach toward creating final pixel modification values that avoid range-limit color and/or tone-scale clipping. In another embodiment of the invention, matrix-processed Chroma values are additionally inserted in to such an algorithm as components of a pair of like cubic terms. These cubic terms function to enhance asymptotic behavior of the algorithm in certain situations.

Abstract: Computer-based, anti-clipping, pre-printing, color-image correction via virtual color-parameter controllers that are provided within the graphic user interface of a print drier. Parameters accommodated include Red, Green and Blue offset, Lightness offset, Gamma and Chroma. Chroma modifications are handled preliminarily by a special mathematical matrix. Matrix-processed Chroma values are then co-processed with other parameter modifications within an anti-clipping, hyperbolic-tangent-function (asymptotic-like) algorithm which implements an asymptotic-like approach toward creating final pixel modification values that avoid range-limit color and/or tone-scale clipping. Final pixel values are drawn from three one-dimensional look-up tables, one for each of the three colors.

Abstract: A system and methodology for removing JPEG-compression artifacts from color images, wherein a first-stage examination of the image takes place to determine, in accordance with several approaches, whether artifact removal is appropriate for the image. Following such examination and characterization, when an image is determined to be a candidate for artifact removal, pixel blocks in the image are examined so that they can be characterized as uniform, busy or transitional, and from these characterizations, appropriate filters, or no filter at all, are employed to prepare such pixels for insertion into a final artifact-removed output color image.