US 6,784,896 B1Granted

Colorization of a gradient mesh

AssigneeVirtual Mirror Corporation

InventorsMichael J. Perani, Yong Joo Kil

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Abstract

Methods and apparatus, including computer program products, implementing techniques for performing colorization of the control points of vector objects in an image represented by digital data. A representation of a digital image is received. The image includes vector objects, and each of the objects is specified by an assemblage of control points each possessing a color. An image sampling utility, a gradient sampling utility, and a mesh painting utility are provided for interactive editing of the image by the user. The image sampling utility, gradient sampling utility, and mesh painting utility have graphical extents and apply a colorization function to control points within that extent, whereby when the control points have been colorized the graphical representation of the vector object is generated.

Claims29

Dependent claims

A computer program product for performing computer graphics operations on an image represented by digital data, the product tangibly embodied in a computer-readable medium, the product comprising instructions operable to cause a programmable processor to:

receive a representation of a digital image, the digital image comprising at least one drawing object organized into a page description, the drawing object comprising a gradient mesh that is specified by control points, the control points having attributes of position on the page description and color;
receive a user input defining events, wherein each event defines a position on the page description;
calculate an extent of the region of influence over the page description based on at least one defined position;
perform a colorization function for each control point lying within the extent of the region of influence;
recalculate an extent of the region of influence for additional defined events;
and
perform a colorization function for each control point lying within the recalculated extent of the region of influence, wherein the programmable processor regenerates the gradient mesh specified by the control points after a colorization function is applied to the control points.

4 more elements

A method of colorizing a gradient mesh, the method comprising:

providing a representation of a digital image comprising at least one drawing object organized into a page description, the drawing object comprising a gradient mesh that is specified by control points, the control points having attributes of position on the page description and color;
producing user defined events, wherein each event defines a position on the page description;
determining an extent of the region of influence over the page description for colorizing based on at least one defined position;
colorizing each control point lying within the extent of the region of influence;
determining additional extents of the region of influence for additional defined events;
colorizing each control point lying within the additional extents of the region of influence;
and
regenerating the gradient mesh specified by the control points after colorizing the control points.

5 more elements

Dependencies are inferred from the claim text.