Image data processing device, image forming apparatus, and recording medium

摘要

An image data processing device processes structured image data including background image data representing a background image, foreground image data representing a foreground image indicating a color and a gross shape, and mask data representing a mask image specifying a prescribed area of the foreground image to be overlaid on the background image. The image data processing device lightens a shade of the background image by applying background color lightening processing to the background data, and lightens a shade of the foreground image less than the shade of the background image by applying foreground color lightening processing to the foreground data.

主权项

1. An image data processing device for processing structured image data including background image data representing a background image, foreground image data representing a foreground image indicating a color and a gross shape, and mask data representing a mask image specifying a prescribed area of the foreground image to be overlaid on the background image, the image data processing device comprising:
a processing unit to lighten a shade of the background image by applying a background color lightening process to the background data, and to lighten a shade of the foreground image less than the shade of the background image by applying a foreground color lightening process to the foreground data, wherein a plurality of color coefficient series is generated, one series per frequency band, by applying discrete wavelet transformation to each of the background data and foreground data, wherein a brightness coefficient increasing process is applied only to a color coefficient series corresponding to a relatively lowest frequency band, and wherein, as an original brightness coefficient positively relatively increases a growth rate of the increased brightness coefficient relatively decreases.