英語「GRAD」の意味・使い方・読み方 | Weblio英和辞書 In a printer 200 where a rendering engine 203 applies color matching processing to received image data to have its own device color space, when the image data are a geometrical object with a color change, a GRAD handler 201 interpolates a color change in the geometrical object on the device color space based on the color matching result at a control point of the geometrical object