---
name: "ilbmtoppm"
section: "1"
platform: "linux"
package: "netpbm"
version: "10.86.51-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/ilbmtoppm"
---

# ilbmtoppm(1)

convert an ILBM file into a PPM image

## NAME

ilbmtoppm - convert an ILBM file into a PPM image

## SYNOPSIS

**ilbmtoppm** \[**-ignore**\<chunkID\>**\]** \[ **-isham** \| **-isnotham** \| **-isehb** \| **-isnotehb** \| **-isdeep** \| **-isnotdeep** \] \[**-cmaponly**\] \[**-adjustcolors**\] \[**-transparent** *color*\] \[**-maskfile** *filename* \[**-verbose**\] \[*ILBMfile*\]

## DESCRIPTION

This program is part of **Netpbm**(1) .

**ilbmtoppm** reads an IFF ILBM file as input and produces a PPM image as output.  **ilbmtoppm** can handle the following ILBM types:

- •

  Normal ILBMs with 1-16 planes.

- •

  Amiga Extra\_Halfbrite (EHB)

- •

  Amiga HAM with 3-16 planes.

- •

  24 bit.

- •

  Multiplatte (normal or HAM) pictures.

- •

  Color map (BMHD + CMAP chunk only, nPlanes = 0).

- •

  Unofficial direct color.  1-16 planes for each color component.

**ilbmtoppm** uses these ILBM chunks: BMHD, CMAP, CAMG (only HAM & EHB flags used), PCHG, BODY unofficial DCOL chunk to identify direct color ILBM.  It ignores these chunks: GRAB, DEST, SPRT, CRNG, CCRT, CLUT, DPPV, DRNG, EPSF.  It ignores, but displays in verbose mode, these: NAME, AUTH, (c), ANNO, DPI.  It skips chunks whose type it doesn't recognize.

## OPTIONS

In addition to the options common to all programs based on libnetpbm (most notably **-quiet**, see \
  Common Options ⟨index.html#commonoptions⟩ ), **ilbmtoppm** recognizes the following command line options:

- **-transparent** *color*

  This is the color that should "show through" in places where the image is transparent.

  *color* is like the  argument of the **pnm\_parsecolor()** library routine ⟨libnetpbm\_image.html#colorname⟩ .

- **-verbose**

  Give some information about the ILBM file.

- **-ignore** *chunkID*

  Skip a chunk.  *chunkID* is the 4-letter IFF chunk identifier of the chunk to be skipped.

- **-isham** \| **-isehb**

  Treat the input file as a HAM or Extra\_Halfbrite picture, even if these flags are not set in the CAMG chunk (or if there is no CAMG chunk).

- **-maskfile** *filename*

  This names a file for **ilbmtoppm** to create with the image's transparency mask.  The mask file is a PBM image which maps to the input image with white pixels representing transparent pixels in the image and black pixels representing opaque pixels.

  If you don't specify this, or the image does not contain transparency information, **ilbmtoppm** does not create a mask file.

- **-cmaponly**

  With this option, **ilbmtoppm** generates a PPM of the ILBM's *color* *map*, not the image itself.

  **ilbmtoppm** does the same thing even without **-cmaponly** if the ILBM is a pure color map stream (it has a bitmap header with an *nplanes* value of zero or has no BODY chunk.

- **-adjustcolors**

  If all colors in the CMAP have a value of less then 16, ilbmtoppm assumes a 4-bit colormap and gives a warning.  With this option the colormap is scaled to 8 bits.

## LIMITATIONS

The multipalette PCHG BigLineChanges and Huffman decompression code is untested.

## REFERENCES

Amiga ROM Kernel Reference Manual - Devices (3rd Ed.) Addison Wesley, ISBN 0-201-56775-X

## SEE ALSO

[**ppmtoilbm**(1)](/ppmtoilbm/1.md) , **ppm**(1)

## AUTHORS

Copyright (C) 1989 by Jef Poskanzer.

Modified October 1993 by Ingo Wilken (*Ingo.Wilken@informatik.uni-oldenburg.de*)

## 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/ilbmtoppm.html**