Patent ID: 8463032

Claim:
An image compressing apparatus for compressing an original document composed of a plurality of pixels, comprising: a first image generating section detecting from the original document an edge of a text and/or a line drawing whose pixel color is black and then generating a first image in which the detected edge is expressed in the form of a binary image; a lossless compressing section performing lossless compression on the generated first image; a second image generating section generating a second image in which the color of the pixels contained in the original document is adjusted such that a density difference of color should be reduced between pixels contained in the edge detected by the first image generating section and the other pixels among the pixels contained in the original document; a lossy compressing section performing lossy compression on the generated second image; and a compressed file generating section generating a compressed file containing the first image having undergone lossless compression and the second image having undergone lossy compression.