Image data compression apparatus capable of reducing false color

摘要

An image data compression apparatus capable of reducing false color in image data to a minimum when image compression or decompression is performed, including a preliminary image compressing portion for compressing image data in a sampling region set in a specific position on an image plane for obtaining preliminary compressed image data; a data size evaluation value calculating portion for calculating a data size evaluation value from a data length of said preliminary compressed image data; a compression ration determining portion for determining compression ratios of the image data to color and luminance data in accordance with the data size evaluation value such that a data size of compressed image when image compression is performed for the entire image plane of the image data equals to a prescribed desired data size and such that the compression ratio of the image data to the color data equals to or exceeds the compression ratio of the image data to the luminance data; and an image compressing portion for performing image compression for the entire image plane of the image data in accordance with the compression ratios of the image data to the color and luminance data. Also included are a method of compressing image data and a digital camera using the image compression apparatus.