摘要 |
PURPOSE:To obtain an optimum image by correcting a deviation and reading the correction so as to adjust an image forming condition when a recording medium with a gradation pattern formed thereon is placed on an original platen with a tilt. CONSTITUTION:When a control start switch is depressed while a color discriminating a fault in the gradation characteristic is designated, an internal generator a 256-gradation pattern image and the pattern is printed out onto a recording medium in the designated color. When a print-out sample 101 is placed on an original platen 102 of a reader, the sample is lighted by a light source 103, a CCD 105 converts the light into a reflected luminous quantity signal through a color separation optical system 104 to read the image. When the recording medium is placed on the original platen 102 with a tilt, a position of a pattern output is corrected. That is, since the reflecting signal of the recording medium differs from that of a rear side of the original platen 102, each edge of the original platen 102 is detected and a relation between a laser output and the density corresponding to the obtained position coordinate information, that is, the 256-gradation pattern is stored in an image memory. |