A mechanism capable of improving the compression efficiency of image data generated by performing the dark reading is provided. An image processing apparatus comprising a reading unit configured to read a document and generate image data, a reading mode setting unit configured to set a reading mode of the reading unit to a first reading mode or a second reading mode, in which the document is read with the amount of light less than that in the first scanning mode, a background color determining unit configured to determine a background color in the image data generated by the reading unit, and a conversion image generating unit configured to generate image data, in which a color close to the background color in the image data is converted into the background color, in a case that the second reading mode is set.

A system and method for encoding a digital image may include obtaining image data of the digital image, wherein the image data comprises a plurality of image pixels, selecting a plurality of sample pixels from the plurality of image pixels, clustering the plurality of sample pixels based on an influence function to generate a plurality of hue clusters, classifying the image pixels to the plurality of the hue clusters, and assigning hue values of the hue clusters to the plurality of the image pixels.

A disclosed scaler resource includes a color management module configured to support two or more color space transformations and two or more color temperature adjustment profiles and to receive first pixel data and perform color processing of the first pixel data to produce second pixel data. The color processing includes a color space transformation in accordance with any of the supported color space transformation matrices and a color temperature adjustment in accordance with any of the supported color temperature adjustment profiles. The color processing is configured wherein a ratio of primary colors produced by performing the color processing on first pixel data corresponding to any primary color is independent of the selected color temperature adjustment profile. The color space transformation may be performed before or after the color temperature adjustment. When performed before, the color transformation matrix is modified to reflect the color temperature adjust profile.

Techniques of color image processing involve performing a transformation for each color channel that mixes intensity values from other channels to produce a new intensity value for that channel. The new intensity values, representing the effect of overlapped response spectra of the S, M, and L cones, then provide values of the sensitivities of the photoreceptors of each of the cones. These values of the sensitivities form the basis of more accurate color image processing. For example, compression ratios of gamma-compressed color images may be increased when more the sensitivities are more accurate.

In an example, a method includes receiving, at a processor, a plurality of property parameter sets representing attainable property combinations in additive manufacturing and being associated with print material description. A constraint of a first property of the property parameter sets may also be received and a hull of a property mapping resource for use in determining additive manufacturing instructions for generating an object in which the first property meets the received constraint may be determined.

A mechanism capable of improving the compression efficiency of image data generated by performing the dark reading is provided. An image processing apparatus comprising a reading unit configured to read a document and generate image data, a reading mode setting unit configured to set a reading mode of the reading unit to a first reading mode or a second reading mode, in which the document is read with the amount of light less than that in the first scanning mode, a background color determining unit configured to determine a background color in the image data generated by the reading unit, and a conversion image generating unit configured to generate image data, in which a color close to the background color in the image data is converted into the background color, in a case that the second reading mode is set.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving, by a palette generation module of a computing system, an input color value that represents an input color. The module identifies a first palette from a plurality of reference palettes that each include a set of colors. The first palette is identified using the input color. In response to identifying the first palette, the module selects a particular color of the first palette based on a minimum computed distance between the input color and the colors of the first palette. The module generates a second palette that includes a second set of colors. The second palette is generated by interpolating the first color palette based on the minimum computed distance used to select the particular color of the first palette.

The present disclosure includes systems and methods for color transfer. The method includes receiving a target image, and determining dominant source colors. The method further includes transforming the target image into a color model including a target luminance component and a target color information component. Additionally, the method includes segmenting the target image into a plurality of target segments based on the target color information component or the target luminance component and extracting dominant target colors from the target image by extracting information for at least one of the dominant target colors from each target segment of the plurality of target segments. Further, the method includes generating a color mapping relationship between the dominant target colors and the dominant source colors, and creating a recolored target image using the color mapping relationship.

Approaches for encoding or decoding when switching color spaces involve signaling of control information for adaptive color space transformation (“ACT”). For example, an encoder encodes a unit of video to produce encoded data. As part of the encoding, the encoder evaluates a condition for the unit and conditionally signals a syntax element that indicates whether ACT is enabled within the unit. The encoder outputs the encoded data as part of a bitstream. A corresponding decoder receives encoded data as part of a bitstream. The decoder decodes the encoded data to reconstruct a unit of video. As part of the decoding, the decoder evaluates a condition for the unit and conditionally parses a syntax element that indicates whether ACT is enabled within the unit. The syntax element is parsed if the condition is satisfied, but otherwise the parsing of the syntax element is skipped.

Disclosed is a method for converting image data. The method includes: acquiring image data of a target image, wherein the image data includes first pixel values of m pixels in the target image, each of the first pixel values includes a first color value of at least one color channel, the first color value being within a target color value interval of the at least one color channel; dividing the target color value interval into n color value partitions; determining a color value partition where the first color value falls from the n color value partitions; and converting the first color value into a second color value according to a position of the first color value in the color value partition, the number of bits occupied by the second color value being less than the number of bits occupied by the first color value.