applypalette

Contents: Description, Arguments, Usage, Examples, Images, Related Functions, Source Supported Under Version: > 1.00 Current .dvrc Version: 1.00 Description Applies a 1-dimensional colour palette to a greyscale image Arguments and Return Values Arguments: The greyscale base image, the colour palette, and optionally the min/max values for the mapping Return Value: An RGB image Usage Syntax: applypalette(baseimage, palette [, min = VAL] [, max = VAL]) This function maps the colours in a 1-dimensional RGB image (e.g. generated by buildgradient) to a greyscale image. For example, applying a "hot/cold" gradient to a thermographic image, or a hue wheel gradient to the hue information extracted from a colour image. The optional min and max values control which values in the greyscale image are mapped to the left and right (respectively) ends of the palette. If they are omitted, they default to 0.0 and 1.0, respectively. Examples The 'Modern Thermograph 3' colour gradient from The Mirror's Surface Breaks applied to thermal imagery of Big Bend National Park: dv> gr_base_image 4000x2000x1 array of float, bip format [32,000,000 bytes] dv> gradient_colour_00 1x1x3 array of float, bsq format [12 bytes] 0.0000000000 0.0000000000 0.0000000000 dv> gradient_colour_01 1x1x3 array of float, bsq format [12 bytes] 0.03921569139 0.0000000000 0.6980391741 dv> gradient_colour_02 1x1x3 array of float, bsq format [12 bytes] 1.000000000 0.0000000000 0.0000000000 dv> gradient_colour_03 1x1x3 array of float, bsq format [12 bytes] 1.000000000 0.9882352948 0.0000000000 dv> gradient_colour_04 1x1x3 array of float, bsq format [12 bytes] 1.000000000 1.000000000 1.000000000 dv> g = buildgradient(1, gradient_colour_00, 13763, gradient_colour_01, 27525, gradient_colour_02, 58327, gradient_colour_03, 65536, gradient_colour_04) Generating a gradient using 5 colours and 3 channels. 65536x1x3 array of float, bsq format [786,432 bytes] dv> i = applypalette(gr_base_image, g, min = 0.0, max = 1.0) Applying the specified palette to the specified image. Images A gradient-map used to denote negative and positive values in the same image:

DavinciWiki Mini-Nav Bar Contents Functions Function Categories Common Procedures Glossary Download Davinci Change Log News Mailing List Contact Developers davinci-dev [AT] mars.asu.edu All other topics See navigation on the left Related Functions buildgradient dshadow.dvrc (Beta) applypalette() Recent Library Changes Change Log Created On: 07-16-2012 Modified On: 05-02-2013

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