Abstract: A digital camera includes a reference value table and a setting change-use table. The reference value table holds a plurality of reference values which respectively corresponds to a plurality of representative colors, and the setting change-use table holds a plurality of target values which respectively corresponds to a plurality of representative colors. Image data of a photographed object is applied to a signal processing circuit, and subjected to a color adjustment based on the reference value held by the reference value table and the target value held by the setting change-use table. An image based on the image data to which the color adjustment is subjected is displayed on a monitor in real-time. When a dial key is operated, the target value of a desired representative color held on the setting change-use table is changed. Therefore, a color tone of a real-time image displayed on the monitor also changes in response to an operation of the dial key.

Abstract: The present invention provides a disk playback device comprising a laser drive circuit 15 for feeding a drive signal to an optical head 4 and adjusting the power of a laser beam irradiated by the optical head 4, an error correcting circuit 11 for detecting an error rate of a reproduced signal, and a system controller 10 for controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correction circuit 11. The system controller 10 retrieves one limit value of two limit values of a reproduction power wherein the error rate is not beyond a prescribed value, and calculates an optimum reproduction power based on the one limit value retrieved. Accordingly it is possible to move to signal reproduction in a short period of time and to reproduce signals with high accuracy by setting the optimum reproduction power.

Abstract: The present invention provides a disk playback device comprising a laser drive circuit 15 for feeding a drive signal to an optical head 4 and adjusting the power of a laser beam irradiated by the optical head 4, an error correcting circuit 11 for detecting an error rate of a reproduced signal, and a system controller 10 for controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correction circuit 11. The system controller 10 retrieves one limit value of two limit values of a reproduction power wherein the error rate is not beyond a prescribed value, and calculates an optimum reproduction power based on the one limit value retrieved. Accordingly it is possible to move to signal reproduction in a short period of time and to reproduce signals with high accuracy by setting the optimum reproduction power.

Abstract: A digital camera includes a reference value table and a setting change-use table. The reference value table holds a plurality of reference values which respectively corresponds to a plurality of representative colors, and the setting change-use table holds a plurality of target values which respectively corresponds to a plurality of representative colors. Image data of a photographed object is applied to a signal processing circuit, and subjected to a color adjustment based on the reference value held by the reference value table and the target value held by the setting change-use table. An image based on the image data to which the color adjustment is subjected is displayed on a monitor in real-time. When a dial key is operated, the target value of a desired representative color held on the setting change-use table is changed. Therefore, a color tone of a real-time image displayed on the monitor also changes in response to an operation of the dial key.