Color chart, image forming apparatus, and reading device
AssigneeRicoh Company, Ltd.
InventorsRie Suzuki, Tatsuya Ishii
Life of this patent
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Abstract
A color chart includes a first portion and a second portion. The first portion includes no patch. The second portion includes a plurality of patches having different densities or luminances. The plurality of patches includes a reference patch indicating a color having a reference density or luminance. The reference patch is adjacent to the first portion. The plurality of patches is located in order of increasing density from the density of the color indicated by the reference patch, decreasing density from the density of the color indicated by the reference patch, increasing luminance from the luminance of the color indicated by the reference patch, or decreasing luminance from the luminance of the color indicated by the reference patch.
Claims12
A color chart comprising:
- a first portion including no patch;
- and
- a second portion including a plurality of patches having different densities or luminances,
- the plurality of patches including a reference patch indicating a color having a reference density or luminance,
- the reference patch being adjacent to the first portion and being one of the outermost patches in the second portion,
- the plurality of patches being disposed in a spiral shape in order of:
- continuously increasing density of the color from the reference patch inward toward a central portion of the second portion;
- continuously decreasing density of the color from the reference patch inward toward the central portion of the second portion;
- continuously increasing luminance of the color from the reference patch inward toward the central portion of the second portion;
- or
- continuously decreasing luminance of the color from the reference patch inward toward the central portion of the second portion,
- wherein the central portion is a last patch of the spiral shape.
Dependencies are inferred from the claim text.