Patent ID: 7068393
Filing Date: 2006-06-27
Classification: H04N

Abstract:
1. An image ratio measuring method in an image forming apparatus for executing image formation by depositing a coloring material on a print medium based on image data, the method comprising: an input step of entering image data; a first conversion step of executing γ-conversion to the image data entered in said input step; an image forming step of executing an image formation based on the image data converted in said first conversion step; a second conversion step of converting the image data before being subjected to the γ-conversion in said first conversion step into image data having a linear relationship with the image density; and a calculation step of calculating an image ratio, based on the number of pixels in which the coloring material is deposited onto the print medium based on the image data converted in said second conversion step, the number of pixels corresponding to the size of the print medium, and the number of gradation levels per pixel.