CgBI - Revision history

Zzo38: It is "pngff" and not "ffpng" that supports this format

2017-12-16T06:52:15Z

It is "pngff" and not "ffpng" that supports this format

Jsummers: Added list of software, etc.

2017-12-14T14:37:26Z

Added list of software, etc.

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|png}} }} == Overview == '''CgBI''' is the informal name of a PNG-like image file format developed by..."

2013-03-07T08:59:54Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|png}} }} == Overview == '''CgBI''' is the informal name of a PNG-like image file format developed by..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|png}}
}}
== Overview ==
'''CgBI''' is the informal name of a [[PNG]]-like image file format developed by Apple. It may also be called '''iOS optimized PNG'''.

It is not compatible with PNG. Standard PNG decoders that don't support it will fail gracefully, due to an unknown "critical chunk".

== Identification ==
Files begin with the standard 8-byte PNG signature. A private "CgBI" chunk appears before the "IHDR" chunk.

== External links ==
* http://iphonedevwiki.net/index.php/CgBI_file_format

[[Category:IOS]]

@@ Line 13: / Line 13: @@
 == Software ==
 * [[XnView]]
-* [[Farbfeld Utilities]]: ffpng
+* [[Farbfeld Utilities]]: pngff
 * [http://www.jongware.com/pngdefry.html pngdefry] (C)
 * https://github.com/briancollins/PNGNormalizer (C)

@@ Line 4: / Line 4: @@
 |extensions={{ext|png}}
 }}
-== Overview ==
+'''CgBI''' is the informal name of a [[PNG]]-like image file format developed by Apple. It is also called '''iOS optimized PNG''', and other similar names.
-'''CgBI''' is the informal name of a [[PNG]]-like image file format developed by Apple. It may also be called '''iOS optimized PNG'''.
-It is not compatible with PNG. Standard PNG decoders that don't support it will fail gracefully, due to an unknown "critical chunk".
+It is not compatible with PNG. PNG decoders that don't support it should fail completely, due to an unknown "critical chunk".
 == Identification ==
-Files begin with the standard 8-byte PNG signature. A private "CgBI" chunk appears before the "IHDR" chunk.
+Files begin with the standard 8-byte [[PNG#Identification|PNG signature]]. A private "CgBI" chunk appears before the "IHDR" chunk. Usually or always, ASCII "{{magic|CgBI}}" appears at offset 12.
 == External links ==