| 摘要 |
An image data processing apparatus includes: a reader that reads image data included an image file in an arrangement order thereof from a storage medium, the image data being coded data of image blocks obtained by dividing an image in a main scanning direction and a sub scanning direction and arranged in an order of the main scanning direction and the sub scanning direction; a storage that temporarily saves the image data read by the reader; and a data processor that requests image data to the reader and performs a specified data processing to the image data fed from the reader in response to the request, wherein the reader executes a variable-length reading mode as a reading mode in which the image data are read from the storage medium and saved in the storage, the variable-length reading mode being for successively reading image data having a shorter data length out of image data of a predetermined specified data length and image data from leading end data to be first read to tail end data in a data arrangement in the storage medium out of image data belonging to the image blocks having the same position in the sub scanning direction as the image block, to which the leading end data belongs, and for saving them in the storage.
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