Image file processing method

An image file processing method, comprising:

• providing an image file of an image by a processor, wherein the image is divided into a plurality of image blocks, at least one row of the image blocks are defined as bands, and the image file comprises:
• a bit stream, representing the image, wherein the bit stream has a plurality of segments individually corresponding to the bands, and a plurality of restart markers are respectively located after the segments except the last segment;
• and
• exchangeable image file (EXIF) data, comprising a plurality of band indicators, wherein the band indicators are individually corresponding to the bands, and each band indicator is used for indicating a position of the segment corresponding to the corresponding band in the bit stream;
• reading at least one band indicator according to an expanded range for selecting local blocks of the image by the processor;
• and
• decoding at least one segment in the bit stream corresponding to at least one band encompassed by the expanded range according to the read band indicator corresponding to the band encompassed by the expanded range by the processor, so as to obtain at least one band.