Method for generating relief prints
First Claim
1. A method for generating a relief print on a substantially flat substrate, wherein palpable differences exist between a height of various parts of the relief print, by a printer comprising a number of colorants including a white colorant, said printer being configured to print a relief print in a number of passes, the method comprising the steps of:
- defining a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a relative height of each pixel of the rasterized relief image;
determining a height parameter for establishing an absolute height scale;
discriminating in the rasterized relief image for each pixel from the substrate to the surface of the relief image a relief part, a white part and a skin part;
deriving from the rasterized relief image a number of pass images to be printed on top of each other, each pass image comprising pass pixels for which a colorant composition is established based on a part of the pixel to which the pass pixel contributes;
printing said number of pass images by applying said established colorant composition on a position of the substrate associated with a pixel in the relief image,wherein the relief part comprises an arbitrary colorant composition, the white part comprises mainly white colorant and the skin part comprises colorants according to a color as defined in the color channels.
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Accused Products
Abstract
A method is provided for processing a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel into several pass images that are printed using a printer with several colorants including a white colorant. For each pixel a relief part, a white part and a skin part are discriminated in order to combine the demands for height and color variation across the surface of the image. The skin part comprises pixels for which a colorant composition based on the color channels of the rasterized relief image is established. In order to print a color in the skin part that is independent of a height of the pixel and independent of the colorant composition of a neighboring pixels, pass images are composed that include only neighboring pass pixels that do not disturb the color forming of a pass pixel contributing to a skin part.
15 Citations
8 Claims
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1. A method for generating a relief print on a substantially flat substrate, wherein palpable differences exist between a height of various parts of the relief print, by a printer comprising a number of colorants including a white colorant, said printer being configured to print a relief print in a number of passes, the method comprising the steps of:
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defining a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a relative height of each pixel of the rasterized relief image; determining a height parameter for establishing an absolute height scale; discriminating in the rasterized relief image for each pixel from the substrate to the surface of the relief image a relief part, a white part and a skin part; deriving from the rasterized relief image a number of pass images to be printed on top of each other, each pass image comprising pass pixels for which a colorant composition is established based on a part of the pixel to which the pass pixel contributes; printing said number of pass images by applying said established colorant composition on a position of the substrate associated with a pixel in the relief image, wherein the relief part comprises an arbitrary colorant composition, the white part comprises mainly white colorant and the skin part comprises colorants according to a color as defined in the color channels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer program product, including computer readable code embodied on a non-transitory computer readable medium, said computer readable code comprising instructions for executing the steps of:
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receiving a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel of the rasterized relief image; discriminating in the rasterized relief image for each pixel from the substrate to the surface of the relief image a relief part, a white part and a skin part; deriving from the rasterized relief image a number of pass images to be printed on top of each other, each pass image comprising pass pixels for which a colorant composition is established based on a part of the pixel to which the pass pixel contributes; transferring said pass images to a print engine, that comprises a white colorant and is configured to print the pass images in a predetermined order by applying said established colorant composition on a position of the substrate associated with a pixel in the relief image, wherein the relief part comprises an arbitrary colorant composition, the white part comprises mainly white colorant and the skin part comprises colorants according to a color as defined in the color channels.
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8. A print system configured to generate relief prints on a substantially flat substrate in a number of passes, wherein palpable differences exist between a height of various parts of the relief print, the print system comprising:
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a print controller; and a print engine, the print engine comprising a number of colorants including a white colorant, wherein the print controller is configured to; receive a rasterized relief image, comprising customary color channels for indicating a color of each pixel and a height channel for indicating a height of each pixel of the rasterized relief image; discriminate in the rasterized relief image for each pixel from the substrate to the surface of the relief image a relief part, a white part and a skin part; derive from the rasterized relief image a number of pass images to be printed on top of each other, each pass image comprising pass pixels for which a colorant composition is established based on a part of the pixel to which the pass pixel contributes; transfer said pass images to the print engine, that is configured to print said number of pass images in a predetermined order by applying said established colorant composition on a position of the substrate associated with a pixel in the relief image, and wherein the relief part comprises an arbitrary colorant composition, the white part comprises mainly white colorant and the skin part comprises colorants according to a color as defined in the color channels.
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Specification