Image processing apparatus for correcting density unevenness
AssigneeKonica Minolta Business Technologies, Inc.
InventorMakoto Ikeda
Life of this patent
Estimating the term…
Abstract
When an input value is a standard value which is smaller than a maximum value (for example, 230), all pixels of a screen matrix is printed with the same output value (for example, 195), when the input value is within the range not more than the standard value, the output value is limited to not more than 195, and number of the pixels is changed so as to express graduation. In the range where the input value exceeds the standard value, the graduation is expressed by changing the output value of each pixel in the range above 195 while printing all the pixels of the screen.
Claims7
An image processing apparatus, comprising:
- an image input section to input image data;
- and
- a screen processing section to screen the inputted image data, comprising:
- a first screen processing section which performs screen processing to express graduation at least by changing a number of pixels to be printed below a predetermined graduation value which is brighter than a maximum graduation value expressed by setting a maximum density for all of pixels of a screen, and
- a second screen processing section which performs screen processing to express graduation by changing the densities of the pixels while printing all the pixels of the screen,
- wherein a matrix size of the screen of the second screen processing section is smaller than a matrix size of the screen of the first screen processing section.
Dependencies are inferred from the claim text.