Method of halftone screen linearization via continuous gradient patches
AssigneeLexmark International, Inc.
InventorsGary Allen Denton, Cary Patterson Ravitz
Life of this patent
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Abstract
A method of calibrating an electrophotographic machine having an image bearing surface includes depositing a toner patch on the image-bearing surface. The toner patch has a nominal coverage that varies substantially continuously from end to end. Light is emitted onto a selected one of the areas of the toner patch. An amount of light that is reflected off of the selected one area of the toner patch is measured. The emitting and measuring steps are repeated for each of a plurality of different areas of the toner patch. At least one electrophotographic condition is adjusted. The adjusting is dependent upon the measuring steps.
Claims22
A method of calibrating an electrophotographic machine having an image-bearing surface, said method comprising the steps of:
- depositing a toner patch on the image-bearing surface, said toner patch having a plurality of areas, said areas having different amounts of toner coverage;
- emitting light onto a selected one of said areas of said toner patch;
- measuring an amount of light that is reflected off of said selected one area of said toner patch;
- repeating said emitting and measuring steps for each of a plurality of different said areas of said toner patch;
- and
- adjusting at least one electrophotographic condition, said adjusting being dependent upon said measuring steps.
A method of calibrating an imaging apparatus, said imaging apparatus being capable of producing images with various levels of darkness, said method comprising the steps of:
- producing a test patch on an image-bearing surface, said test patch having a continuous gradient of shade levels;
- emitting light onto a selected one of said areas of said test patch;
- measuring an amount of light that is reflected off of said selected one area of said test patch;
- repeating said emitting and measuring steps for each of a plurality of different said areas of said test patch;
- and
- adjusting at least one imaging condition, said adjusting being dependent upon said measuring steps.
Dependencies are inferred from the claim text.