| 摘要 |
PROBLEM TO BE SOLVED: To shorten time of decompressing a compressed bit map image and expanding it to an original bit map image when displaying an image. SOLUTION: When a compressed image file 30 is prepared by compressing an original image having a large image size by JPEG or the like at an image source side such as a digital camera 10, an intermediate size image of the original image minified to an intermediate size and a thumbnail image of the original image minified even smaller are made, and compressed data of the intermediate size image and the thumbnail image are also stored in the compressed image file 30 along with the compressed data of the original image. In an image display device side such as a printer 20, compressed data of an image with a proper size is selected from the compressed image file 30 in accordance with an image size necessary in a requested image display operation, and the image is displayed by decompressing the compressed data and expanding it into a bit map. For example, when an image is to be displayed in a small liquid crystal panel 23, the intermediate size image is selected, when a multiplicity of images are to be printed as a list in one sheet of paper, the thumbnail image is selected, and when one image is to be printed in one sheet of paper at high resolution, the original image is selected.
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