TIFF - Revision history

Zarl: /* BigTiff */ bigtiff enabled libtiff download

2010-02-20T12:52:04Z

‎BigTiff: bigtiff enabled libtiff download

Erik Krause: /* Tools and sources */ linked to wikipedia LCMS page

2009-07-15T14:22:27Z

‎Tools and sources: linked to wikipedia LCMS page

Zarl: /* Compression issues */ LZW only useful for 8 bit tiffs

2008-02-03T16:49:46Z

‎Compression issues: LZW only useful for 8 bit tiffs

Erik Krause: interwiki linked

2007-11-20T16:38:08Z

interwiki linked

Erik Krause: Prepared for new glossary template

2007-11-18T19:37:06Z

Prepared for new glossary template

Imroy: copyedit

2007-09-24T10:36:32Z

copyedit

Zarl: BigTIFF for LibTiff 4.0

2007-05-27T11:57:09Z

BigTIFF for LibTiff 4.0

Zarl: deleted Signature as it's part of the article's history

2007-05-27T11:34:06Z

deleted Signature as it's part of the article's history

Bruno: linkify

2007-02-07T21:40:24Z

linkify

Jdsmith: /* Layers */

2006-10-08T23:29:57Z

‎Layers

@@ Line 62: / Line 62: @@
 == BigTiff ==
-One approach to overcome the current file size limitations of the format is a [http://www.remotesensing.org/libtiff/BigTIFFProposal.html proposal] for a new TIFF specification called ''BigTiff'' for the free libTIFF library. Thanks to [http://www.remotesensing.org/libtiff/bigtiffpr.html sponsors like Leica Geosystems] developers of open source software like PanoTools can plan to use LibTiff 4.0 from August 2007. More information is available from [http://www.awaresystems.be/imaging/tiff.html AWare Systems].
+One approach to overcome the current file size limitations of the format is a [http://www.remotesensing.org/libtiff/BigTIFFProposal.html proposal] for a new TIFF specification called ''BigTiff'' for the free libTIFF library. Thanks to [http://www.remotesensing.org/libtiff/bigtiffpr.html sponsors like Leica Geosystems] developers of open source software like PanoTools can plan to use LibTiff 4.0 from August 2007. More information is available from [http://www.awaresystems.be/imaging/tiff.html AWare Systems]. An unofficial release of libtiff which enables BigTIFF is available from [http://www.aperio.com/bigtiff/ Aperio].
 [[Category:Glossary]]

@@ Line 58: / Line 58: @@
 * '''[[ImageMagick]]''' command line image processing package.
 * '''TIFF libraries''' and specification from libtiff.org: [http://libtiff.org/]
-* '''[[lcms|Little CMS]]''' provides a tool called '''tifficc''' for applying an ICC [[colour profile]] to a TIFF file.
+* '''[[lcms|Little CMS]]''' provides a tool called '''tifficc''' for applying an ICC [[colour profile]] to a TIFF file: [[wikipedia: LittleCMS]]
 == BigTiff ==

@@ Line 7: / Line 7: @@
 * '''No compression''' is the most compatible form but results in the largest files.
 * '''JPEG''' Simply a [[JPEG]] file stored inside a TIFF tag, lossy compression.
-* '''LZW''' is a very common, lossless compression scheme resulting in smaller files. LZW was patented in most countries until 2004 and hence was not found in many freeware distributions.
+* '''LZW''' is a very common, lossless compression scheme resulting in smaller 8 bit files. LZW was patented in most countries until 2004 and hence was not found in many freeware distributions. This compression method is not useful for 16 bit TIFFs.
 * '''ZIP''' ('''Deflate''') is lossless too but not very common although it usually results in smaller files than LZW and was not patented.
 * '''PackBits''' A not very common, lossless compression scarcely supported by image editing software. [[Photoshop]] for example can read PackBits compressed TIFFs but not write them.

← Older revision		Revision as of 16:38, 20 November 2007
Line 1:		Line 1:
−	The {{Glossary\|'''Tagged Image File Format''' (TIFF) is a widely used and open [[image format]] used to store and exchange digital images of all kinds.\|1}} For general information see the [~~http~~:~~//en.wikipedia.org/wiki/TIFF~~ TIFF Wikipedia page]	+	The {{Glossary\|'''Tagged Image File Format''' (TIFF) is a widely used and open [[image format]] used to store and exchange digital images of all kinds.\|1}} For general information see the [[w:TIFF]] Wikipedia page

	TIFF is a very versatile file format with many flavors. TIFF files typically have a ''.tif'' file extension. If you can't see file extensions, you may want to [[enable windows file extensions]] as you will have great difficulty editing and manipulating image files otherwise.		TIFF is a very versatile file format with many flavors. TIFF files typically have a ''.tif'' file extension. If you can't see file extensions, you may want to [[enable windows file extensions]] as you will have great difficulty editing and manipulating image files otherwise.

← Older revision		Revision as of 19:37, 18 November 2007
Line 1:		Line 1:
−	The '''Tagged Image File Format''' (TIFF) is a widely used and open [[image format]] used to store and exchange digital images of all kinds. For general information see the [http://en.wikipedia.org/wiki/TIFF TIFF Wikipedia page]	+	The {{Glossary\|'''Tagged Image File Format''' (TIFF) is a widely used and open [[image format]] used to store and exchange digital images of all kinds.\|1}} For general information see the [http://en.wikipedia.org/wiki/TIFF TIFF Wikipedia page]

	TIFF is a very versatile file format with many flavors. TIFF files typically have a ''.tif'' file extension. If you can't see file extensions, you may want to [[enable windows file extensions]] as you will have great difficulty editing and manipulating image files otherwise.		TIFF is a very versatile file format with many flavors. TIFF files typically have a ''.tif'' file extension. If you can't see file extensions, you may want to [[enable windows file extensions]] as you will have great difficulty editing and manipulating image files otherwise.

@@ Line 1: / Line 1: @@
-The Tagged Image File Format is a widely used and open [[Image format]] used to store and exchange digital images of all kinds. For general information see the [http://en.wikipedia.org/wiki/TIFF TIFF Wikipedia page]
+The '''Tagged Image File Format''' (TIFF) is a widely used and open [[image format]] used to store and exchange digital images of all kinds. For general information see the [http://en.wikipedia.org/wiki/TIFF TIFF Wikipedia page]
-TIFF is a very versatile file format with many flavors. TIFF files typically have a ''.tif'' file extension.
+TIFF is a very versatile file format with many flavors. TIFF files typically have a ''.tif'' file extension. If you can't see file extensions, you may want to [[enable windows file extensions]] as you will have great difficulty editing and manipulating image files otherwise.
 If you can't see file extensions, you may want to [[enable windows file extensions]]
 as you will have great difficulty editing and manipulating image files otherwise.
-=== Compression issues ===
+== Compression issues ==
 TIFF can contain almost any image data. However, there are some common forms of image data compression found inside a TIFF file:
 * '''No compression''' is the most compatible form but results in the largest files.
 * '''JPEG''' Simply a [[JPEG]] file stored inside a TIFF tag, lossy compression.
-* '''LZW''' is a very common, lossless compression scheme resulting in smaller files. '''LZW''' was patented in most countries until 2004 and hence was not found in many freeware distributions.
+* '''LZW''' is a very common, lossless compression scheme resulting in smaller files. LZW was patented in most countries until 2004 and hence was not found in many freeware distributions.
 * '''ZIP''' ('''Deflate''') is lossless too but not very common although it usually results in smaller files than LZW and was not patented.
 * '''PackBits''' A not very common, lossless compression scarcely supported by image editing software. [[Photoshop]] for example can read PackBits compressed TIFFs but not write them.
-* '''G3''' and '''G4''' compression is used for FAX documents only.
+* '''G3''' and '''G4''' compression is used for 1-bit FAX documents only.
 PTStitcher (and hence all the [[GUI front-ends]] that use it) outputs PackBits compressed image files if the output format is TIFF. There is a bug in [[Photoshop]] prior to Version 9 (CS2) that prevents to open PackBits compressed files beyond a certain size. See [[Photoshop limitations#opening large TIFFs with Photoshop|opening large TIFFs with Photoshop]] for details.
-=== Bit depth ===
+== Bit depth ==
-TIFF can contain data of varying bit depth but for photographic purpose only 8 bit or 16 bit per channel are of interest. However, there is a specification that contains 32 bit data per channel floating point format for high [[dynamic range]] images.
+TIFF can contain data of varying bit depth but for photographic purpose only 8-bit or 16-bit per channel are of interest. However, there is a specification that contains 32-bit data per channel floating point format for high [[dynamic range]] images.
 There can be any number of channels. Common examples are
@@ Line 25: / Line 23: @@
 * any number of additional channels (called alpha channels) specifying masks, selections, additional color channels or what ever.
-All channels in an image have the same bit depth, hence a [[RGB]] image with 16 bit per channel often is reffered to as a 48 bit image, with 8 bit per channel as a 24 bit image.
+All channels in an image have the same bit depth, hence a [[RGB]] image with 16-bit per channel often is reffered to as a 48-bit image, with 8-bit per channel as a 24-bit image.
-The Panotools main applications process 8 bit as well as 16 bit per channel images. Details see [[Full 16 bit workflow]]
+The Panotools main applications process 8-bit as well as 16-bit per channel images. Details see [[Full 16 bit workflow]]
-=== Alpha channels and masks ===
+== Alpha channels and masks ==
 [[Alpha channel]]s are used by panotools to store masks. A mask contains information to which extent the  image should be used. For this purpose the alpha channel contains a black-and-white image where the   pixel value determines the transparency of the corresponding image pixel.
@@ Line 37: / Line 35: @@
 * If the output type 'without feather' (TIFF_m) is used, a mask is created that reflects the remapped input image borders.
 * For the 'with feather' (TIFF_mask) output the mask is calculated to give a seam between adjacent images that lies more or less in the middle of the overlap area. There is a 'feather' parameter to control the width of a grayscale gradient to allow for smooth blending between the images. See PTStitcher sample script on Jim Watters page for details: [http://photocreations.ca/panotools/stitch.txt]
 In any case there is a problem to use this alpha channels as intended in [[Photoshop]], since Photoshop does not know about the intended use. It loads the alpha channel but doesn't use it to control transparency. This can be achieved manually by loading the alpha channel as selection and creating a mask with 'reveal selection'. Erik Krause provides a Photoshop action set on his page that can be used to automate this for all images in a panorama: [[Stitching actions]]
-=== Layers ===
+== Layers ==
 Standard TIFF doesn't support layers. If a [[Photoshop]] document with layers is saved as TIFF Photoshop creates a flat TIFF image file (for compatibility) and the layer data in a separate TIFF tag. This separate TIFF tag can be compressed using RLE (run length encoding) or ZIP compression. ZIP usually results in smaller files, smaller even as if saved as [[PSD]] (where you can't choose the compression format).
@@ Line 51: / Line 48: @@
 [[nona]] and [[PTmender]] can create [[cropped TIFF]] output where the image data is just a small area within the final image dimensions.  This is a useful way to save resources when assembling many images into a final panorama.  Cropped TIFF input files are also supported by [[enblend]].
-=== Non-image data ===
+== Non-image data ==
-Since TIFF is a tagged format it can contain additional non-image data either comparable to the [[EXIF]] data in [[JPEG]] files or other. [[Photoshop]] for example inserts XML formatted data that causes warning messages in some programs based on the common TIFF libraries. At least some of the [[EXIF]] tools can be used to view and/or manipulate the corresponding data in TIFF files, too.
+Since TIFF is a tagged format it can contain additional non-image data either comparable to the [[EXIF]] data in [[JPEG]] files or other. [[Photoshop]] for example inserts XML formatted data that causes warning messages in some programs based on the common TIFF libraries. At least some of the EXIF tools can be used to view and/or manipulate the corresponding data in TIFF files, too.
-TIFF supports embedded [[colour profile|color profiles]]. Unfortunately [[PTStitcher]] discards the profile information when it saves TIFF files (the [[nona]] stitcher doesn't have this bug). Hence the appropriate profile should be assigned to PTStitcher result images when loaded into a color management aware image editor.
+TIFF supports embedded [[color profile]]s. Unfortunately [[PTStitcher]] discards the profile information when it saves TIFF files (the [[nona]] stitcher doesn't have this bug). Hence the appropriate profile should be assigned to PTStitcher result images when loaded into a color management aware image editor.
-=== Tools and sources ===
+== Tools and sources ==
 Although the major image processors and viewers cope very well with TIFF it might be necessary from time to time to use some other tools - for batch processing, for conversion of scarcely supported TIFF flavors or simply to get enhanced information.
 * '''TIFF tools''' - A free package available from libtiff.org: [http://libtiff.org/] Windows executables at the Gnu Win32 Project: [http://gnuwin32.sourceforge.net/packages/libtiff.htm]
@@ Line 63: / Line 60: @@
 * '''[[lcms|Little CMS]]''' provides a tool called '''tifficc''' for applying an ICC [[colour profile]] to a TIFF file.
-=== BigTiff ===
+== BigTiff ==
 One approach to overcome the current file size limitations of the format is a [http://www.remotesensing.org/libtiff/BigTIFFProposal.html proposal] for a new TIFF specification called ''BigTiff'' for the free libTIFF library. Thanks to [http://www.remotesensing.org/libtiff/bigtiffpr.html sponsors like Leica Geosystems] developers of open source software like PanoTools can plan to use LibTiff 4.0 from August 2007. More information is available from [http://www.awaresystems.be/imaging/tiff.html AWare Systems].
 [[Category:Glossary]]

← Older revision		Revision as of 11:57, 27 May 2007
Line 63:		Line 63:
	* '''[[lcms\|Little CMS]]''' provides a tool called '''tifficc''' for applying an ICC [[colour profile]] to a TIFF file.		* '''[[lcms\|Little CMS]]''' provides a tool called '''tifficc''' for applying an ICC [[colour profile]] to a TIFF file.

		+	=== BigTiff ===
		+
		+	One approach to overcome the current file size limitations of the format is a [http://www.remotesensing.org/libtiff/BigTIFFProposal.html proposal] for a new TIFF specification called ''BigTiff'' for the free libTIFF library. Thanks to [http://www.remotesensing.org/libtiff/bigtiffpr.html sponsors like Leica Geosystems] developers of open source software like PanoTools can plan to use LibTiff 4.0 from August 2007. More information is available from [http://www.awaresystems.be/imaging/tiff.html AWare Systems].

	[[Category:Glossary]]		[[Category:Glossary]]

@@ Line 47: / Line 47: @@
 Some applications (like for example [[nona]], the [[PTStitcher]] replacement in the [[hugin]] package) can write single files that contain multiple TIFF images. If these TIFF files are loaded into [[Photoshop]] only the first image will be visible. They can be split into single images with '''tiffsplit''' from the TIFF tools package or [[ImageMagick]] (See [[#Tools and sources|Tools section]]).
-Current versions of the [[Gimp]] image editor can read these TIFF files with multiple images, though they are flattened to one image when saved - A workaround is to save these layers as separate files using the [[Gimp|save-layers-tiff]] plug-in.
+Current versions of the [[Gimp]] image editor can read these TIFF files with multiple images, though they are flattened to one image when saved - A workaround is to save these layers as separate files using the [[Multi-Layer TIFF editing with the Gimp|save-layers-tiff]] plug-in.
 [[nona]] and [[PTmender]] can create [[cropped TIFF]] output where the image data is just a small area within the final image dimensions.  This is a useful way to save resources when assembling many images into a final panorama.  Cropped TIFF input files are also supported by [[enblend]].