CMU Window Manager bitmap - Revision history

Marco at 15:03, 22 February 2016

2016-02-22T15:03:41Z

Jsummers: /* Software */

2015-06-12T02:12:16Z

‎Software

Jsummers at 16:53, 8 August 2013

2013-08-08T16:53:03Z

Jsummers: /* Format */

2013-06-30T22:11:25Z

‎Format

Jsummers: Add category

2013-06-30T22:06:42Z

Add category

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics }} '''CMU Window Manager bitmap''' (possibly also known as '''ITC''' bitmap) is an uncompressed bi-level raster image file..."

2013-06-30T22:04:09Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics }} '''CMU Window Manager bitmap''' (possibly also known as '''ITC''' bitmap) is an uncompressed bi-level raster image file..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Graphics
}}
'''CMU Window Manager bitmap''' (possibly also known as '''ITC''' bitmap) is an uncompressed bi-level raster image file format. It was apparently used by old versions of the Andrew Toolkit.

== Format ==
There are evidently several varieties of the format, which differ in the size of the header, and the [[Endianness|byte order]] of the header fields.

According to Netpbm, files have a 14-byte header containing a signature, width, height, and depth (which is always 1). The signature begins with the <code>F1</code> byte, and the header fields use big-endian byte order.

The [[file command]] thinks that the header is 16 bytes (''depth'' being 4 bytes instead of 2), the byte order is little-endian, and the signature still begins with <code>F1</code>.

The ATK 6.3 source code implies that header can be 14 or 16 bytes, and that the byte order is indicated by the signature.

(Yes, we know that all of these things cannot be true at the same time.)

== Identification ==
Files begin with signature bytes <code>F1 00 40 BB</code>, or <code>BB 40 00 F1</code>.

== See also ==
* [[CMU Andrew Toolkit image]]

== Software ==
* [http://netpbm.sourceforge.net/ Netpbm]: cmuwmtopbm, pbmtocmuwm
* ftp://ftp.andrew.cmu.edu/pub/AUIS/auis-6.3/atk/raster/lib/ → oldrf.c

@@ Line 27: / Line 27: @@
 == Software ==
 * [[Netpbm]]: cmuwmtopbm, pbmtocmuwm
 * [[XnView]]

@@ Line 27: / Line 27: @@
 == Software ==
-* [http://netpbm.sourceforge.net/ Netpbm]: cmuwmtopbm, pbmtocmuwm
+* [[Netpbm]]: cmuwmtopbm, pbmtocmuwm
-* [http://www.xnview.com/ XnView]
+* [[XnView]]
 * ftp://ftp.andrew.cmu.edu/pub/AUIS/auis-6.3/atk/raster/lib/ → oldrf.c
 [[Category:CMU]]

← Older revision		Revision as of 22:06, 30 June 2013
Line 25:		Line 25:
	* [http://netpbm.sourceforge.net/ Netpbm]: cmuwmtopbm, pbmtocmuwm		* [http://netpbm.sourceforge.net/ Netpbm]: cmuwmtopbm, pbmtocmuwm
	* ftp://ftp.andrew.cmu.edu/pub/AUIS/auis-6.3/atk/raster/lib/ → oldrf.c		* ftp://ftp.andrew.cmu.edu/pub/AUIS/auis-6.3/atk/raster/lib/ → oldrf.c
		+
		+	[[Category:CMU]]

@@ Line 2: / Line 2: @@
 |formattype=electronic
 |subcat=Graphics
 }}
 '''CMU Window Manager bitmap''' (possibly also known as '''ITC''' bitmap) is an uncompressed bi-level raster image file format. It was apparently used by old versions of the Andrew Toolkit.
@@ Line 10: / Line 11: @@
 According to Netpbm, files have a 14-byte header containing a signature, width, height, and depth (which is always 1). The signature begins with the <code>F1</code> byte, and the header fields use big-endian byte order.
-The [[file command]] thinks that the header is 16 bytes (''depth'' being 4 bytes instead of 2), the byte order is little-endian, and the signature still begins with <code>F1</code>.
+The [[file command]] thinks that the header is at least 16 bytes (''depth'' being 4 bytes instead of 2), the byte order is little-endian, and the signature still begins with <code>F1</code>.
 The ATK 6.3 source code implies that the header can be 14 or 16 bytes, and that the byte order is indicated by the signature.
 (Yes, we know that all of these things cannot be true at the same time.)
 == Identification ==
@@ Line 24: / Line 28: @@
 == Software ==
 * [http://netpbm.sourceforge.net/ Netpbm]: cmuwmtopbm, pbmtocmuwm
 * ftp://ftp.andrew.cmu.edu/pub/AUIS/auis-6.3/atk/raster/lib/ → oldrf.c
 [[Category:CMU]]