Multilayer white printing with white-balance
White-balance is improved when printing on colored media, while minimizing the time and use of costly materials required by present approaches. In an embodiment, the typical solid white fill or background layer is altered by including in the white layer one or more of the other colors already available in the printer to shade this layer. Thus, a small amount of cyan, for example, helps balance a pink-ish (red) media; yellow is used for blue media; and magenta is used for green media; as well as combinations thereof. A combination of transparent process inks and opaque white helps to maintain brightness (luminosity).
1. A method for printing an image on a substrate having a particular color other than white, with a printer having an inkset, wherein the inkset includes a plurality of inks having white ink and an ink having a color other than white, the method comprising:
receiving a media identifier that uniquely identifies a media type and the particular color of the substrate;
retrieving from a stored configuration file, based at least on the particular color of the media type identified by the media identifier, a first offset color value for a first offset color, wherein the first offset color value indicates an amount of the ink other than white;
printing on the substrate of the identified media type in a first pass a first layer of ink, including the white ink mixed with the amount of ink other than white indicated by the first offset color value;
wherein the printed first layer of ink appears as a neutral color, so that the particular color of the substrate is not visible; and
printing the image on top of the printed first layer of ink.
2. The method of claim 1 , wherein the particular color of the substrate is not visible through the printed first layer of ink.
3. The method of claim 1 , wherein colors of the printed image are not modified based on the particular color of the substrate.
4. The method of claim 1 , wherein a mechanism for receiving the media identifier is configured to receive the media identifier from a user.
5. The method of claim 1 , further comprising:
measuring a region of color of a white layer printed on a test piece of substrate having the particular color other than white with an optical measuring device;
determining, based on a measurement obtained from the optical measuring device, a measured color value for the region of color;
determining an offset color value of an offset color, wherein the offset color value indicates an amount of the ink having the color other than white with which to mix with white ink to mask the particular color of the substrate when printing the first layer on the substrate having the particular color other than white; and
storing the measured color value in the stored configuration file in association with the media type of the substrate having the particular color other than white.
6. The method of claim 1 , further comprising:
receiving from a user, through a user interface, an indication of a substrate type on which to print the image;
wherein the substrate type indicates the particular color of the substrate.
7. The method of claim 1 , wherein the ink having a color other than white includes at least two inks having colors other than white, and wherein the first offset color value indicates an amount of each of the at least two inks having colors other than white.
8. The method of claim 7 , further comprising:
adding an entry to the configuration file for the media type of the particular color;
printing a layer of the white ink on a test piece of substrate of the media type of the particular color;
determining that the layer of white ink appears as comprising a second color hue;
measuring the second color hue to determine a second color hue value;
determining a third offset color value of a third offset color based on the second color hue value, wherein the third offset color value indicates an amount of each of the at least two inks having colors other than white to mix with the white ink; and
storing in the entry of the configuration file the third offset color value in association with the media type of the particular color.
9. The method of claim 8 , wherein the
measuring the second color hue is performed with any of a spectrophotometer, a densitometer, or a camera.
10. The method of claim 8 , wherein the second color hue value comprises a red, green, and blue (RGB) value.
11. The method of claim 8 , wherein the determined third offset color value comprises a determined inverse of the second color hue value.
12. The method of claim 8 , further comprising:
storing the third offset color value in the configuration file entry as a red, green, and blue (RGB) value.
13. The method of claim 8 , further comprising:
storing the third offset color value in the configuration file entry as a cyan, magenta, and yellow (CMY) value.
14. The method of claim 1 , further comprising:
determining the amount of the ink having a color other than white to mix with the white ink to form a neutral layer, by:
looking up a second offset color value in a white balance profile based on the first offset color value, wherein the white balance profile was previously created for the type of ink being used by the printer; and
determining the amount of the inks having a color other than white indicated by the second offset color value.
15. A method for printing an image on a substrate having a particular color other than white, with a printer having an inkset, wherein the inkset includes a plurality of inks having white ink and an ink having a color other than white, the method comprising:
receiving from a user, through a user interface, a color value for each of at least one of a plurality of colors;
wherein the user interface includes:
an interactive element for each of the plurality of colors, the interactive element receiving from the user a color value corresponding to each of the colors;
a trigger element for causing the printer to print a sample block color by mixing white ink with specified amounts of colored inks indicated by each of the color values; and
an input element that allows the user, responsive to visually inspecting the sample block color, to select one or more color values to store in a configuration entry in association with the substrate and the particular color;
receiving a media identifier that uniquely identifies a media type and the particular color of the substrate;
retrieving from the stored configuration entry, based at least on the particular color of the media type identified by the media identifier, a first offset color value for a first offset color, wherein the first offset color value indicates an amount of the ink other than white;
printing on the substrate of the identified media type in a first pass a first layer of ink, including the white ink mixed with the amount of ink other than white indicated by the first offset color value, wherein the printed first layer of mixed ink appears as a neutral color, so that the particular color of the substrate is not visible; and
printing the image on top of the printed first layer of ink.
16. The method of claim 15 , further comprising:
storing, in association with the media identifier, the one or more color values received from the user.
17. A method of printing an image on a substrate having a particular color other than white, with a printer having an inkset, wherein the inkset includes a plurality of inks having white ink, cyan ink (C), magenta ink (M), and yellow ink (Y), the method comprising:
receiving a media identifier that uniquely identifies a media type and the particular color of the substrate;
retrieving from a stored configuration file, based at least on the particular color of the media type identified by the media identifier, a first offset color value for a first offset color, wherein the first offset color value indicates an amount of each of the C, M and Y inks;
printing on the substrate of the identified media type in a first pass a first layer of ink, including the white ink mixed with the amount of each of the C, M and Y inks indicated by the first offset color value; and
printing the image on top of the printed first layer of ink.
18. The method of claim 17 , wherein the white ink is opaque, and wherein the C, M and Y inks are transparent process inks.
19. The method of claim 18 , wherein the combination of transparent process inks and the opaque white ink helps to maintain brightness.
20. A method of printing an image on a substrate having a particular color other than white, with a printer having an inkset, wherein the inkset includes a plurality of inks having white ink and at least two inks each having a color other than white, the method comprising:
receiving a media identifier that uniquely identifies a media type and the particular color of the substrate;
retrieving from a stored configuration file, based at least on the particular color and the media type identified by the media identifier, a first offset color value for a first offset color, wherein the first offset color value indicates an amount of each of the at least two inks having colors other than white;
printing on the substrate of the particular color and the identified media type in a first pass a first layer of ink, including the white ink mixed with the amount of each of the at least two inks having colors other than white indicated by the first offset color value; and
printing the image on top of the printed first layer of ink.