Method for reproducing one or more target colors on photographic paper or the like

A method of obtaining a target color on color photosensitive photographic media, utilizing a given light source and color filters, said method comprising

• (a) preparing a color reference data base expressing the primary color component makeup of a plurality of colors illuminated by the light source,
• (b) determining from the data base the constituent primary color component makeup of the target color under illumination by a like light source,
• (c) selecting a group of filters capable of reproducing the target color by appropriate sequential exposures and development of the color sensitive photographic material,
• (d) determining from the constituent primary color component makeup of each filter under illumination by a like light source and from the color component makeup and saturation time of the photographic material in relation to the given light source the respective color filter exposure times appropriate to substantially reproduce the target color on the photographic media when developed,
• (e) exposing the undeveloped color sensitive photographic media to the light source in sequence through each color filter for each respective filter exposure time thus determined, to substantially reproduce the target color on the photographic media when developed, and
• (f) developing the exposed photographic media.

A method of photographically substantially reproducing a target color on color sensitive photographic material using a light source and a group of one or more color filter elements, said method comprising:

• (a) illuminating the target color with the light source or equivalent thereof and determining the proportion of the three primary colors which constitute said target color by comparing the target color to a color reference data base comprising a plurality of colors constituted of said primary colors under illumination by a like light source whereby to select from said data base a reference color most similar to the target color and thereby identify a group of one or more color filter elements usable to reproduce the reference color;
• (b) determining the exposure time of each color filter element required substantially to reproduce the reference color and thus the target color on the color sensitive photographic material when developed;
• (c) exposing undeveloped color sensitive photographic material through each color filter element for a period corresponding to the exposure time thus determined for each respective color filter element;
• and
• (d) developing the exposed color sensitive photographic material thereby substantially to reproduce the target color thereon.

A method of photographically substantially reproducing a target color directly on color sensitive photographic material using a given light source and a group of one or more color filters, said method comprising:

• (a) identifying the proportionate primary color component density and gray level of the target color in relation to the given light source at a given Kelvin temperature and with a given spectral distribution;
• (b) selecting a given color sensitive photographic material and identifying the primary color component makeup and saturation time thereof in relation to such given light source;
• (c) inputting such target color and photographic media characteristics to a color reference data base correlating such characteristics with the color component makeups and filter percentages of various color filters determined in relation to the given light source and determining from such color reference data base the identity of and respective exposure times necessary substantially to reproduce the target color on the color sensitive photographic material by exposure thereof to the illuminant source through the group of color filters;
• (d) exposing the given color sensitive photographic material to the given light source through each of the group of such color filters for each respective exposure time thus determined;
• and
• (e) developing the exposed color sensitive photographic material to substantially reproduce the target color thereon.

A method for photographically substantially reproducing a target color on color photographic material using a light source and a set of color filter elements, said method comprising:

• (a) illuminating the target color and determining the proportion of three primary colors of red, green and blue which constitute the illuminated target color by comparing said illuminated target color to a data base comprising a plurality of colors constituted of said primary colors whereby to select from said data base a reference color most similar to the target color and thereby identify a group of one or more color filter elements usable to reproduce said reference color;
• (b) determining the exposure time of each color filter element required substantially to reproduce the target color on said color photographic material when developed;
• (c) exposing undeveloped color photographic material through each color filter element for a period corresponding to the exposure time determined for each respective color filter element;
• and
• (d) developing the exposed color photographic material thereby substantially to reproduce the target color thereon.