Method of setting color copying conditions

A method of setting color copying conditions of a color copying machine, said copying machine being provided with scanning means for scanning an original to be copied placed on a copy table with illuminating light;

• cyan, magenta and yellow filters disposed in a copying light path between said copying table and a recording material;
• and three light measuring means, one individual to each of three primary colors, said method comprising the steps of:
• scanning a plate having a constant density with said illuminating light to detect three primary color components of light reflected from said plate through said filters using said three light measuring means, respectively, said filters being placed in turn in said copying light path and changed in position stepwise;
• so as to obtain three primary color exposures;
• scanning said plate again with said illuminating light to make a color copy of said plate through said filters placed in turn in said copying light path;
• scanning said color copy to detect three color components of light reflected from said color copy using said three primary light measuring means, so as to detect amounts of light reflected from said color copy for said three primary colors;
• logarithmically transforming said reflected amounts of light into color densities of said color copy of said three primary colors;
• providing relationships between said color densities and said three primary color exposures for said three primary colors;
• and
• adjusting said filters so as to make said relationships coincide with predetermined relationships between densities and exposures for said three primary colors.

A method of setting color copying conditions of a color copying machine, said color copying machine being provided with scanning means for scanning an original placed on a copying table with illuminating light and three light measuring means, one individual to each of three primary colors, said method comprising the steps of:

• scanning a test chart having density patterns for said three primary colors to detect three primary color components of light reflected from said test chart using said three light measuring means, so as to detect three primary color exposures based on said three primary primary color components;
• scanning said test chart again to make a color copy thereof;
• scanning said color copy to detect three primary color components of the light reflected from said color copy using said three light measuring means, so as to detect light quantities for said three primary colors;
• logarithmically transforming said light quantities into color densities for said three primary colors;
• providing relationships between said three primary color densities and said three primary color exposures for said three primary colors;
• and
• controlling exposures for said three primary colors based on said relationships, respectively.

A method of setting a color copying machine to various copying conditions, said copying machine being provided with a scanning means for scanning an original to be copied with illuminating light;

• cyan, magenta and yellow filters disposed in a copying light path between said original and a recording material;
• and three light measuring means, one individual to each of three primary colors;
• said method comprising the steps of:
• scanning a plate having a uniform density to detect three primary color components of light reflected from said plate through said cyan, magenta and yellow filters disposed in turn in said optical path and stepwise changed in position, using said three light measuring means, respectively, so as to obtain three color exposures for said three primary colors;
• scanning said plate again with said illuminating light so as to make a color copy of said plate through said filters placed in turn in said copying light path;
• scanning said color copy to detect three primary color components of light reflected from said color copy using said three light measuring means, so as to detect amounts of light reflected from said color copy for said three primary colors;
• logarithmically transforming said amounts of light into color densities for said three primary colors;
• providing relationships between said color densities and said three color exposures for said three primary colors;
• and
• controlling exposures for said three primary colors based on said relationships, respectively.

A method of setting color copying conditions of a color copying machine comprising the steps of:

• making a color copy of density patterns in three primary colors;
• scanning said color copy with illuminating light to detect the amount of three primary color light components reflected from said color copy, using said three primary light measuring means:
• logarithmically transforming said light amounts into color densities for said three primary colors;
• providing relationships between said three primary color densities and said light amounts previously memorized in a memory of said color copying machine for said three primary colors;
• detecting exposures as desired values corresponding to white level copy densities based on said relationships for said three colors;
• and
• measuring a reflection plate having said white level copy densities to detect light reflected from said reflection plate for said three colors;
• and
• subsequently controlling three color exposures based on said relationship by adjusting cyan, magenta and yellow filters positioned in a copying light path so as to make said detected exposures coincide with said desires values for said three colors, thereby controlling said three color exposures.

A method of setting color copying conditions of a color copying machine comprising the steps of:

• making a color copy of density patterns in three primary colors;
• scanning said color copy with illuminating light to detect the amount of three primary color light components reflected from said color copy, using said three primary light measuring means;
• logarithmically transforming said light amounts into color densities for said three primary colors;
• providing relationships between said three primary color densities and said light amounts previously memorized in a memory of said color copying machine for said three primary colors;
• detecting exposures as desired values corresponding to white level copy densities based on said relationships for said three colors;
• and
• subsequently controlling three color exposures based on said relationship by adjusting cyan, magenta and yellow filters positioned in a copying light path based on relationships between opening positions of said cyan, magenta and yellow filters and light amounts passed through said color filters to amounts of light passed through said color filters at said positions for said three colors, thereby controlling said three color exposures.

A method of setting color copying conditions of a color copying machine, said copying machine being provided with scanning means for scanning an original with illuminating light;

• three light measuring means, one individual to each of three primary colors;
• and filters for regulating respective components of light, said method comprising the steps of:
• scanning a test chart having density patterns for said three primary primary colors to detect three primary color components of light reflected from said test chart using said three light measuring means, so as to obtain three primary color exposures based on said three primary color components and store them in a memory;
• and
• setting copying conditions for said three primary colors, said setting step comprising the steps of:
• scanning said test chart to make a color copy thereof;
• scanning said color copy to detect three primary color components of light reflected from said color copy using said three primary light measuring means, so as to detect reflected amounts of light for said three primary colors;
• logarithmically transforming said reflected amounts of light into color densities for said three primary colors;
• providing relationships between said three primary color exposures read out from said memory and said three primary colors densities;
• and
• adjusting said three color filters so as to make said relationships coincide with predetermined relationships between color densities and exposures for said three primary colors, respectively.

A method of setting color copying conditions of a color copying machine, said copying machine being provided with scanning means for scanning an original placed on a copying table with illuminating light and three light measuring means, one individual to each of three primary colors, said method comprising the steps of:

• scanning a test chart having density patterns for said three primary primary colors to detect three primary color components of light reflected from said test chart using said three light measuring means, so as to obtain three primary color exposures based on said three primary color components and store them in a memory;
• and
• setting copying conditions for said three primary colors, said setting step comprising the steps of:
• scanning said test chart again to make a color copy thereof;
• scanning said color copy to detect three primary color components of light reflected from said color copy using said three primary light measuring means, so as to detect light quantities for said three primary colors;
• logarithmically transforming said light quantities into color densities for said three primary colors;
• providing relationships between said three primary color exposures read out from said memory and said three primary colors densities;
• and
• controlling exposures for said three colors, based on said relationships, respectively.