Pampaintspill User Manual(1)General Commands ManuaPampaintspill User Manual(1) NAME pampaintspill - smoothly spill colors into the background SYNOPSIS pampaintspill [--bgcolor=color] [--wrap] [--all] [--downsample=number] [--near=number] [--power=number] [filename] [-randomseed=integer] Minimum unique abbreviations of option are acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option name from its value. DESCRIPTION This program is part of Netpbm(1). pampaintspill produces a smooth color gradient from all of the non- background-colored pixels in an input image, effectively "spilling paint" onto the background. pampaintspill is similar to pamgradient but differs in the following characteristics: • pampaintspill accepts any number of paint sources (non-background-colored pixels), which can lie anywhere on the canvas. pamgradient accepts exactly four paint sources, one in each corner of the image. • pampaintspill requires an input image while pamgradient generates a new image from scratch. • pampaintspill can produce tileable output and can control how tightly the gradient colors bind to their source pixels. Results are generally best when the input image contains just a few, crisp spots of color. Use your drawing program's pencil tool - as op- posed to a paintbrush or airbrush tool - with a small nib. OPTIONS In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options ⟨index.html#commonoptions⟩ ), pampaintspill recognizes the following command line options: --bgcolor=color Explicitly specify the background color. color can be specified using any of the formats accepted by the pnm_parsecolor() library routine ⟨libnetpbm_image.html#colorname⟩ such as red or #ff0000. If --bgcolor is not specified, pampaintspill makes an educated guess about the background color based on the colors in the image's corners. --wrap Allow gradients to wrap around image borders. That is, colors that spill off the right side of the image reappear on the left side of the image and likewise for left/right, top/bottom, and bottom/top. --wrap makes images tileable, which is nice for producing desktop backgrounds. --all Recolor all pixels, not just background pixels. Normally, non-background-colored pixels in the input image appear unmodified in the output image. With --all, all pixels are colored based on their distance from all of the (other) non-back- ground-colored pixels. --downsample=number Ignore all but number non-background-colored pixels. When a large number of pixels in the input image differ in color from the background, pampaintspill runs very slowly. The --downsample option randomly selects a given number of colored pixels to use as paint sources for the gradients and ig- nores the rest, thereby trading off image quality for speed of execution. --near=number Consider only the nearest number paint sources when computing a pixel's new color. The default is to consider all paint sources. In most cases, number should be fairly small, or its im- pact will be minimal and execution time will increase unneces- sarily. A value of 1 produces a coloring that looks a lot like a Voronoi diagram. This option was new in Netpbm 10.97 (December 2021). --power=number Control how color intensity changes as a function of the distance from a paint source. The default value for number is -2.0, which means that intensity drops (because of the mi- nus sign) with the square (because of the 2.0) of the distance from each paint source. -2.0 generally works well in practice, but other values can be specified for various special effects. With very small numbers of paint sources, -1.0 may produce subtler gradients, but these get muddier as the number of paint sources increases. Positive numbers (e.g., 1.0 and 2.0) make the paint sources stand out in the output image by pushing the gradients away from them. -randomseed=integer This is the seed for the random number generator that generates the pixels. Use this to ensure you get the same image on separate invoca- tions. This option was new in Netpbm 10.94 (March 2021). SEE ALSO • pamgradient(1) • ppmmake(1), • ppmrainbow(1), • pgmramp(1), • ppmpat(1), • pam(1) HISTORY pampaintspill was new in Netpbm 10.50 (March 2010). COPYRIGHT Copyright © 2010–2021 Scott Pakin, scott+pbm@pakin.org. Table Of Contents • SYNOPSIS ⟨#synopsis⟩ • DESCRIPTION ⟨#description⟩ • OPTIONS ⟨#options⟩ • SEE ALSO ⟨#seealso⟩ • HISTORY ⟨#history⟩ • COPYRIGHT ⟨#copyright⟩ DOCUMENT SOURCE This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at http://netpbm.sourceforge.net/doc/pampaintspill.html netpbm documentation 02 November 2021 Pampaintspill User Manual(1)
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