pampaintspill man page

pampaintspill - smoothly spill colors into the background

Synopsis

pampaintspill [--bgcolor=color] [--wrap] [--all] [--downsample=number] [--power=number] [filename]

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:

Results are generally best when the input image contains just a few, crisp spots of color. Use your drawing program's pencil tool - as opposed to a paintbrush or airbrush tool - with a small nib.

Options

--bgcolor=color

  Explicitly specify the background color. color can be
     specified using any of the formats accepted by the ppm_parsecolor() library       routine 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-background-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 ignores the rest,
     thereby trading off image quality for speed of execution.

--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 minus 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.

See Also

History

pampaintspill was new in Netpbm 10.50 (March 2010).

Table Of Contents

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

Info

netpbm documentation