An example of a color management module is disclosed. The color management module is to generate a mapping from an incoming color space to a printer color space by a color pipeline. In the generation of the mapping, the color pipeline is adjusted so that the mapping of a target color associated with a first composition further includes adding a quantity of a second composition to the mapping of the target color. The second composition comprises a lower visibility than the first composition.

In an example, a method includes receiving, at a processor, a digital version of an image combined with a machine readable graphic code. Areas of the combined image and graphic code that have a lightness level below a threshold level may be determined. Print instructions for depositing a metallic pattern wherein solid areas of the metallic pattern correspond to the areas of the combined image and graphic code that have a lightness level below the threshold level may also be determined.

The disclosure extends to methods, systems, and computer program products for producing an image in light deficient environments with luminance and chrominance emitted from a controlled light source.

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.

Certain examples described herein relate to a color processing apparatus and a method of generating configuration data for a color rendering device. The color rendering device operates based on color state instructions indicating output color states for portions of a rendered output. Render data may be generated by applying a halftone matrix and color data may indicate probability values for the output color states for input image areas corresponding to the portions of the rendered output. In described examples, configuration data defines an order of output color states for application of the halftone matrix. In the order, the output color states are grouped within the data based on color properties of a rendered output and an order within the clusters is based on colorant composition.

In an example, a method includes receiving, at a processor, a digital version of an image combined with a machine readable graphic code. Areas of the combined image and graphic code that have a lightness level below a threshold level may be determined. Print instructions for depositing a metallic pattern wherein solid areas of the metallic pattern correspond to the areas of the combined image and graphic code that have a lightness level below the threshold level may also be determined.

A pulse rate and respiratory rate measuring method includes acquiring a facial image comprising a face of a user, calculating a color signal from a predetermined number of skin regions of interest in the face of the user in the facial image, calculating a pulse wave signal or a respiratory signal by converting an extracted signal into a time domain after extracting a signal in a frequency band corresponding to pulse or respiration in frequency data obtained by converting the color signal into a frequency domain, and measuring a pulse rate or a respiratory rate corresponding to the frequency band based on peak interval information in the pulse wave signal or the respiratory signal.

The present invention provides an inspection apparatus that inspects an image formed on a recording medium by a printing apparatus. The inspection apparatus stores, as a reference image, image data used to form an image on the recording medium, obtains target image data to be inspected, by reading an image to be inspected formed on the recording medium. The inspection apparatus applies noise components to the reference image, aligns the reference image to which the noise components have been applied with the target image data, and performs collation processing between the reference image and the target image data that have been aligned.

A method of color separation of a digital image into two color and black inks for four or more color printing, in which an original digital image is converted into coordinates of an opponent color space of a print according to base vectors of a paper and of the colored inks, and vectors of the relative application of said inks to the print. In the opponent color space, the color coordinates of base vectors of the paired application of two adjacent colored inks are determined on a CaS chromaticity diagram of the color characteristics of N colored printing inks. The colors that fall in the color gamut of the printing inks are separated into N sectors each group of colors of the image of the original is separated into two colored inks, which correspond on the CaS chromaticity diagram to a selected sector of the colors of paired application of these inks, and a third black ink, and N color-separation image channels for the colored inks and a single common separated image channel for the black ink are formed for all of the colors of the image of the original.

An image processing device includes: one or more processors including hardware. The one or more processors are configured to: calculate, on a basis of a reference image acquired by capturing an image of a reference subject which has an optical characteristic that is equivalent to at least a part of a living body, image transformation parameters through congruence transformation that transforms a coordinate corresponding to a color of target region included in the reference image defined in a color space into a coordinate corresponding to an achromatic color in the color space; and perform, in the color space on a basis of the calculated image transformation parameters, the congruence transformation of colors of a color image acquired by capturing an image of the living body, the color image being constituted by at least two monochromatic image corresponding to different illumination having different center wavelengths.