A printing apparatus includes a head capable of discharging CMYK inks including a K ink, and a control unit configured to, based on image data to be printed, generate ink amount data for controlling an ink amount of each of the CMYK inks discharged by the head, and to control the head based on the ink amount data, wherein the control unit generates the ink amount data as ink amount data such that lightness of a composite color at least does not increase in a direction from a freely-selected coordinate point toward a black point, the composite color being formed by the CMY inks excluding the K ink based on ink amount data of each of the CMYK inks corresponding to a coordinate on a straight line from the freely-selected coordinate point toward the black point in a predetermined hue range of a color gamut of a color space of the image data.

A printing apparatus includes a head capable of discharging CMYK inks including a K ink, and a control unit configured to, based on image data to be printed, generate ink amount data for controlling an ink amount of each of the CMYK inks discharged by the head, and to control the head based on the ink amount data, wherein the control unit generates the ink amount data as ink amount data such that lightness of a composite color at least does not increase in a direction from a freely-selected coordinate point toward a black point, the composite color being formed by the CMY inks excluding the K ink based on ink amount data of each of the CMYK inks corresponding to a coordinate on a straight line from the freely-selected coordinate point toward the black point in a predetermined hue range of a color gamut of a color space of the image data.

A printing apparatus includes a head capable of discharging CMYK inks including a K ink, and a control unit configured to, based on image data to be printed, generate ink amount data for controlling an ink amount of each of the CMYK inks discharged by the head, and to control the head based on the ink amount data, wherein the control unit generates the ink amount data as ink amount data such that lightness of a composite color at least does not increase in a direction from a freely-selected coordinate point toward a black point, the composite color being formed by the CMY inks excluding the K ink based on ink amount data of each of the CMYK inks corresponding to a coordinate on a straight line from the freely-selected coordinate point toward the black point in a predetermined hue range of a color gamut of a color space of the image data.

A printing apparatus includes a head capable of discharging CMYK inks including a K ink, and a control unit configured to, based on image data to be printed, generate ink amount data for controlling an ink amount of each of the CMYK inks discharged by the head, and to control the head based on the ink amount data, wherein the control unit generates the ink amount data as ink amount data such that lightness of a composite color at least does not increase in a direction from a freely-selected coordinate point toward a black point, the composite color being formed by the CMY inks excluding the K ink based on ink amount data of each of the CMYK inks corresponding to a coordinate on a straight line from the freely-selected coordinate point toward the black point in a predetermined hue range of a color gamut of a color space of the image data.

A light-emitting component includes a light-emitting element, a driving thyristor, and a light-absorbing layer. The light-emitting element emits light of a predetermined wavelength. The driving thyristor causes the light-emitting element to emit light or causes an amount of light emitted by the light-emitting element to increase, upon entering an on-state. The light-absorbing layer is disposed between the light-emitting element and the driving thyristor such that the light-emitting element and the driving thyristor are stacked, and absorbs light emitted by the driving thyristor.

A light-emitting component includes a substrate, a light-emitting element, a thyristor, and a light-transmission reduction layer. The light-emitting element is disposed on the substrate. The thyristor causes the light-emitting element to emit light or causes an amount of light emitted by the light-emitting element to increase, upon entering an on-state. The light-transmission reduction layer is disposed between the light-emitting element and the thyristor such that the light-emitting element and the thyristor are stacked, and suppresses light emitted by the thyristor from passing therethrough.

A layered structure includes a thyristor and a light-emitting element. The thyristor at least includes four layers. The four layers are an anode layer, a first gate layer, a second gate layer, and a cathode layer arranged in this order. The light-emitting element is disposed such that the light-emitting element and the thyristor are connected in series. The thyristor includes a semiconductor layer having a bandgap energy smaller than bandgap energies of the four layers.

A light-emitting component includes a light-emitting element, a thyristor, and a light-absorbing layer. The thyristor includes a semiconductor layer having a bandgap energy smaller than or equal to a bandgap energy equivalent to a wavelength of light emitted by the light-emitting element. The thyristor causes the light-emitting element to emit light or causes an amount of light emitted by the light-emitting element to increase, upon entering an on-state. The light-absorbing layer is disposed between the light-emitting element and the thyristor such that the light-emitting element and the thyristor are stacked. The light-absorbing layer absorbs the light emitted by the light-emitting element.

An ink-jet recording apparatus includes: a recording head including nozzles and driving elements corresponding to the nozzles respectively; a controller; and a head driving circuit connected to the controller by a first signal line, a second signal line, and a third signal line through which a clock signal including edges is transmitted, the head driving circuit connected electrically to the driving elements. Each of the driving elements jets an ink from one of the nozzles corresponding thereto by an amount corresponding to driving voltage applied from the head driving circuit. The controller repeatedly executes output processing in which pattern signals indicating patterns of the driving voltage are continuously outputted to the first signal line while being synchronized with the clock signal and selection signals are continuously outputted to the second signal line while being synchronized with the clock signal.

A light-emitting component includes a light-emitting element, a thyristor, and a light-absorbing layer. The thyristor includes a semiconductor layer having a bandgap energy smaller than or equal to a bandgap energy equivalent to a wavelength of light emitted by the light-emitting element. The thyristor causes the light-emitting element to emit light or causes an amount of light emitted by the light-emitting element to increase, upon entering an on-state. The light-absorbing layer is disposed between the light-emitting element and the thyristor such that the light-emitting element and the thyristor are stacked. The light-absorbing layer absorbs the light emitted by the light-emitting element.