# pnmtotiffcmyk - convert a Netpbm image into a CMYK encoded TIFF file - man(1) - [phpMan] > **TLDR:** Convert a PNM image to a CMYK encoded TIFF. > - Convert a PNM image to a CMYK encoded TIFF: `pnmtotiffcmyk {{path/to/input_file.pnm}} > {{path/to/output_file.tiff}}` - Specify the TIFF compression method: `pnmtotiffcmyk -{{none|packbits|lzw}} {{path/to/input_file.pnm}} > {{path/to/output_file.tiff}}` - Control the fill order: `pnmtotiffcmyk -{{msb2lsb|lsb2msb}} {{path/to/input_file.pnm}} > {{path/to/output_file.tiff}}` *Source: tldr-pages* --- _Pnmtotiffcmyk_ _User_ [_Manual_(1)](https://www.chedong.com/phpMan.php/man/Manual/1/markdown) General Commands Manual _Pnmtotiffcmyk_ _User_ [_Manual_(1)](https://www.chedong.com/phpMan.php/man/Manual/1/markdown) ## NAME pnmtotiffcmyk - convert a Netpbm image into a CMYK encoded TIFF file ## SYNOPSIS **pnmtotiffcmyk **[**-none**|**-packbits**|**-lzw**] [**-predictor _**n_] [**-msb2lsb**|**-lsb2msb**] [**-rowsperstrip _**n_] [**-lowdotrange _**n_] [**-highdotrange _**n_] [**-knor‐** **mal**|**-konly**|**-kremove**] [[**-default**] [**-theta _**deg_] [**-gamma _**n_] [**-gammap _**n_] [**-negative**] ## DESCRIPTION This program is part of [**Netpbm**(1)](https://www.chedong.com/phpMan.php/man/Netpbm/1/markdown). **pnmtotiffcmyk**reads a PNM image as input and produces a CMYK encoded TIFF file as output. It optionally modifies the color balance and black level, and modifies removal of CMY from under K. Output is to Standard Output, but unlike with most Netpbm programs, Standard Output must be a seekable file. An ordinary file is fine, but you cannot pipe the output to another program. Furthermore, the program replaces any content currently in the file even if it was opened for appending. **pamtotiff **generates many other kinds of TIFF files. ## OPTIONS In addition to the options common to all programs based on libnetpbm (most notably **-quiet**, see [ Common Options](index.html#commonoptions) ), **pnmtotiffcmyk **recognizes the following command line options: The order of most options is not important, but options for particular conversion algorithms must appear after the algorithm is selected (**-default**,**-negative**). If you don't select an al‐ gorithm, **pnmtotiffcmyk **assumes **-default **and the appropriate options (**-theta**,**-gamma**,**-gammap**) can appear anywhere. ### -none,-packbits,-lzw,-predictor Tiff files can be compressed. By default, **pnmtotiffcmyk **uses LZW decompression, but (appar‐ ently) some readers cannot read this, so you may want to select a different algorithm (**-none**,**-packbits**). For LZW compression, a **-predictor **value of 2 forces horizontal differenc‐ ing of scanlines before encoding; a value of 1 forces no differencing. ### -msb2lsb,-lsb2msb These options control fill order (default is **-msb2lsb**). ### -rowsperstrip This sets the number of rows in an image strip (data in the Tiff files generated by this pro‐ gram is stored in strips - each strip is compressed individually). The default gives a strip size of no more than 8 kb. ### -lowdotrange,-highdotrange These options set tag values that may be useful for printers. ### -knormal,-kremove,-konly These options control the calculation of the CMYK ink levels. They are useful only for test‐ ing and debugging the code. ### -kremove be if the black level were normal. ### -konly ### -default,-negative These options control what ink levels **pnmtotiffcmyk **uses to represent each input color. ### -negative options apply to this algorithm. The algorithm is included as an example in the source code to help implementors of other conversions. ### -default -negative line. The default conversion from RGB to CMYK is as follows: The basic values of the 3 pigments are C = 1-R, M = 1-G, Y = 1-B. From this, **pnmtotiffcmyk **chooses a black (K) level which is the minimum of those three. It then replaces that much of the 3 pigments with the black. I.e. it subtracts K from each of the basic C, M, and Y values. The options below modify this conversion. ### -theta deg ### -theta because, in practice, inks do not exactly complement the primary colors. It rotates the col‐ ors (before black replacement) by _deg_ degrees in the color wheel. Unless you are trying to produce unusual effects you will need to use small values. Try generating three images at -10, 0 (the default) and 10 degrees and see which has the best color balance. ### -gamma n ### -gamma stead of calculating the K value as min(C,M,Y), **pnmtotiffcmyk **raises that value (normalised to the range 0 to 1) to the _n_th power. In practice, this means that a value greater than 1 makes the image lighter and a value less than 1 makes the image darker. The range of allowed values is 0.1 to 10. ### -gammap n This option controls the black replacement. If you specify **-gammap**, **pnmtotiffcmyk **uses the specified gamma value in computing how much ink to remove from the 3 pigments, but still uses the regular gamma value (**-gamma **option) to generate the actual amount of black ink with which to replace it. Values of _n_ from 0.01 to 10 are valid. For example, it may be best to only subtract black from the colored inks in the very darkest regions. In that case, _n_ should be a large value, such as 5. As a special case, if _n_ is -1, **pnmtotiffcmyk **does not remove any pigment (but still adds the black ink). This means dark areas are even darker. Furthermore, when printed, dark areas contain a lot of ink which can make high contrast areas, like lettering, appear fuzzy. It's hard to see what the utility of this is. ## SEE ALSO [**pamtotiff**(1)](https://www.chedong.com/phpMan.php/man/pamtotiff/1/markdown), [**tifftopnm**(1)](https://www.chedong.com/phpMan.php/man/tifftopnm/1/markdown), [**pnm**(1)](https://www.chedong.com/phpMan.php/man/pnm/1/markdown) ## AUTHOR Copyright (c) 1999 Andrew Cooke (Jara Software). Released under the GPL with no warranty. See source or COPYRIGHT and LICENCE files in distribution for full details. Much of the code uses ideas from other Netpbm programs, written by Jef Poskanzer (thanks go to him and libtiff maintainer Sam Leffler). A small section of the code - some of the tiff tag settings - is derived directly from pnmtotiff, by Jef Poskanzer, which, in turn, acknowl‐ edges Patrick Naughton with the following text: Derived by Jef Poskanzer from ras2tif.c, which is: Copyright (c) 1990 by Sun Microsystems, Inc. Author: Patrick J. Naughton <_naughton@wind.sun.com_> Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This file is provided AS IS with no warranties of any kind. The author shall have no liability with respect to the infringement of copyrights, trade secrets or any patents by this file or any part thereof. In no event will the author be liable for any lost revenue or profits or other special, indirect and consequential damages. ## DOCUMENT SOURCE This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at **** netpbm documentation 21 March 2017 _Pnmtotiffcmyk_ _User_ [_Manual_(1)](https://www.chedong.com/phpMan.php/man/Manual/1/markdown)