# phpman > man > ppmrainbow(1)

> **TLDR:** Generate a rainbow.
>
- Generate a rainbow consisting of the specified colors:
  `ppmrainbow {{color1 color2 ...}} > {{path/to/output_file.ppm}}`
- Specify the size of the output in pixels:
  `ppmrainbow {{-w|-width}} {{width}} {{-h|-height}} {{height}} {{color1 color2 ...}} > {{path/to/output_file.ppm}}`
- End the rainbow with the last color specified, do not repeat the first color:
  `ppmrainbow {{-n|-norepeat}} {{color1 color2 ...}} > {{path/to/output_file.ppm}}`

*Source: tldr-pages*

---

[ppmrainbow(1)](https://www.chedong.com/phpMan.php/man/ppmrainbow/1/markdown)                          General Commands Manual                         [ppmrainbow(1)](https://www.chedong.com/phpMan.php/man/ppmrainbow/1/markdown)



## NAME
       ppmrainbow - Generate a rainbow


## SYNOPSIS
       **ppmrainbow** [**-width=**_number_] [**-height=**_number_]
       [**-tmpdir=**_directory_] [**-verbose**] _color_ ...


       All  options can be abbreviated to their shortest unique prefix.  You may use two hyphens in‐
       stead of one to designate an option.  You may use either white space or equals signs  between
       an option name and its value.


## DESCRIPTION
       **ppmrainbow** generates a PPM image that fades from one color to another to another from left to
       right, like a rainbow.  The colors are those you specify on the command line, in that  order.
       The first color is added again on the right end of the image.

       If you want a vertical or other non-horizontal rainbow, run the output through **pnmrotate**.

       One  use  for such a rainbow is to compose it with another image under an alpha mask in order
       to add a rainbow area to another image.  In fact, you can make rainbow-colored text by  using
       **pbmtext**, **pnmcomp**, and **ppmrainbow**.


## OPTIONS
### -width
              The width in pixels of the output image.

              Default is 600.

### -height
              The height in pixels of the output image.

              Default is 8.

### -tmpdir
              The directory specification of the directory **ppmrainbow** is to use for temporary files.

              Default is the value of the **TMPDIR** environment variable, or _/tmp_ if **TMPDIR** is not set.

### -verbose
              Print  the  "commands"  (invocations of other Netpbm programs) that **ppmrainbow** uses to
              create the image.


## SEE ALSO
       [**ppmmake**(1)](https://www.chedong.com/phpMan.php/man/ppmmake/1/markdown), [**pnmcomp**(1)](https://www.chedong.com/phpMan.php/man/pnmcomp/1/markdown), [**pbmtext**(1)](https://www.chedong.com/phpMan.php/man/pbmtext/1/markdown), [**ppmfade**(1)](https://www.chedong.com/phpMan.php/man/ppmfade/1/markdown), [**ppm**(5)](https://www.chedong.com/phpMan.php/man/ppm/5/markdown).


## AUTHOR
       Arjen Bax wrote **ppmrainbow** in June 2001 and contributed it to the Netpbm package.  Bryan Hen‐
       derson wrote this man page in July 2001.





                                             1 July 2001                               [ppmrainbow(1)](https://www.chedong.com/phpMan.php/man/ppmrainbow/1/markdown)