Patent Document ID: 6064494
Application ID: 08578947
Patent Status: 1

Claim One:
1. An image processing apparatus comprising, a scanner which reads a color document to provide color data; a means for obtaining lightness data and chroma data of an interest pixel from the color data obtained by said scanner; a decision means for deciding from the lightness data if the interest pixel exists at an edge and for deciding from the chrome data if an image at the interest pixel is black or not, a first data operation means for increasing the data of black of the interest pixel by a prescribed amount when said decision means decides that the interest pixel exists at the edge and that the image at the interest pixel is black; a color conversion means for converting the color data received from said scanner to data of cyan, magenta, yellow and black; and a second data operation means for replacing the data of cyan, magenta and yellow of the interest pixel which is decided to exist at the edge and to have the image thereof of black with minima of data of cyan, magenta and yellow of pixels in a prescribed region around the interest pixel.