A purple-fringe correction method includes determining: (1) a first distance between a first pixel in a purple-fringe area in an image and an overexposed area in the image and (2) a second distance between the first pixel and a non-overexposed, non-purple-fringe area in the image. The first pixel in the purple-fringe area is corrected based on the first distance and the second distance.

An MFD is disclosed. For example, the MFD includes a printhead to dispense print material, an enhancement printhead to dispense an enhancement printing fluid, a processor and a non-transitory computer-readable medium storing a plurality of instructions. The instructions when executed by the processor cause the processor to perform operations that include determining that an automated enhancement feature was selected, analyzing each pixel of an image to be printed to determine one or more pixels that are to receive the enhancement printing fluid, controlling the printhead to print the image, and controlling the enhancement printhead to dispense the enhancement printing fluid on the one or more pixels that are to receive the enhancement printing fluid.

An MFD is disclosed. For example, the MFD includes a printhead to dispense print material, an enhancement printhead to dispense an enhancement printing fluid, a processor and a non-transitory computer-readable medium storing a plurality of instructions. The instructions when executed by the processor cause the processor to perform operations that include determining that an automated enhancement feature was selected, analyzing each pixel of an image to be printed to determine one or more pixels that are to receive the enhancement printing fluid, controlling the printhead to print the image, and controlling the enhancement printhead to dispense the enhancement printing fluid on the one or more pixels that are to receive the enhancement printing fluid.

A recorded and fixed color image, including: a plurality of pixels; in which a pixel, of the plurality of pixels, contains two or more additive process color areas; in which each additive process color area, of the two or more additive process color areas, has a centroid located within an area of the pixel; in which locations of the centroids, within the area of the pixel, are present in two or more configurations in the plurality of pixels is disclosed. A method of forming a color image is also disclosed.

An image processing apparatus (100) includes a determination unit configured to determine, on the basis of color information of a detected writing target, color information of an output image generated from a writing content image that is an image of a writing content written on the writing target.

A processor selects a target sheet from a plurality of predetermined sheet candidates in accordance with selection information that is input via an input device. Furthermore, the processor derives feature information regarding a noise point from a target image that is obtained through an image reading process performed on an output sheet output from an image forming device, the noise point being a dot-like noise image included in the target image. Furthermore, the processor determines whether or not the noise point is a dot-like sheet noise by applying the feature information to a determination algorithm that corresponds to the target sheet, the sheet noise being included in a sheet of the output sheet itself, the determination algorithm being one of a plurality of determination algorithms that respectively correspond to the plurality of sheet candidates.

An image correction method for correcting multiple original images captured under illumination by multiple different light source colors in generating a composite image by superposing the original images, includes obtaining a correction amount for correcting a position of a fiducial mark recognized from a reference image of a specific light source color in reference images of the multiple different light source colors; obtaining correction amounts for correcting positions of the fiducial mark recognized from the reference images of other light source colors than a specific light source color to the reference position in the reference image of the specific light source color; and when the original images are captured, correcting collectively distortion aberration and chromatic aberration of the original images of the multiple different light source colors using the correction amounts associated with the multiple different light source colors.

An image forming apparatus includes an image forming unit configured to form an image on a sheet; an image processing unit configured to perform processing, which comprises correction of color misregistration, on image data for controlling the image forming unit to form the image; and a controller configured to instruct the image forming unit to perform calibration in a case where a component of the image forming unit is replaced. The image forming unit includes a storage unit, and is configured to acquire correction information to be used for the correction of color misregistration in the calibration to store the correction information in the storage unit, and the image processing unit includes a memory configured to store first image data, which is the image data before being processed, and second image data, which is obtained by compressing the image data after being processed.

An image processing apparatus includes a storage device to store a shading pattern in which a condition of gradation values of a target pixel and a plurality of pixels having a predetermined positional relationship with respect to the target pixel are set, a processor to acquire an multiple value image, generate a binary image from the multiple value image, detect a pixel satisfying the condition set in the shading pattern from the multiple value image as a part of a shading, a generate a shading removal pattern for removing the detected shading, based on the multiple value image, generate a shading removal image by applying the shading removal pattern to the binary image, and an output device to output the shading removal image or information generated using the shading removal image.

A method for suppressing chromatic aberration, especially blue or red fringing, in a digital image with multiple color channels is disclosed. The method comprises negatively correcting a first color channel by subtracting an overshoot component of the first color channel. The subtraction is subject to a lower threshold, which is dependent on a local value of at least one further color channel.