Photoshop limitations - Revision history

Zarl: Undo revision 12519 by Pantheist (Talk)

2010-08-10T07:51:24Z

Undo revision 12519 by Pantheist (Talk)

Pantheist: /* Resizing introduces a visible seam line */

2010-08-10T06:48:10Z

‎Resizing introduces a visible seam line

Imroy: copyedit

2007-09-26T04:23:51Z

copyedit

Zarl: /* Page description */ deleted my signature

2007-05-25T11:05:57Z

‎Page description: deleted my signature

Erik Krause: /* Opening large TIFFs with Photoshop */ typo

2007-03-21T14:46:57Z

‎Opening large TIFFs with Photoshop: typo

Bruno: linkified

2006-09-03T18:29:59Z

linkified

WikiSysop: 5 revision(s)

2006-07-13T20:26:08Z

5 revision(s)

WikiSysop: 1 revision(s)

2006-07-13T19:55:21Z

1 revision(s)

Erik Krause: /* Resizing introduces a visible seam line */ linkified

2005-12-02T20:05:13Z

‎Resizing introduces a visible seam line: linkified

Erik Krause: /* Resizing introduces a visible seam line */ linkified

2005-12-02T20:05:13Z

‎Resizing introduces a visible seam line: linkified

New page

== Page description ==

This article covers bugs and limitations of the widely used application [[Photoshop]] and hopefully their workarounds. Some problems are '''system''' specific (different flavours of Mac OS and Windows), some are found in a certain '''program version''' (like Photoshop Elements, 7.x, 8.x aka CS or 9.x aka CS2) or '''file type''' specific (e.g. 16 bit TIFF files with alpha masks). Some of the workarounds might advise to use a different application for a certain task.

: <small>Carl von Einem [[User:Zarl|Zarl]] 04:17, 28 Oct 2005 (EDT)</small>

== Opening large TIFFs with Photoshop ==

'''Photoshop CS for Windows''' has a bug when opening [[TIFF]] files that exceed a certain size and are compressed using the ''packbit'' format. If you try you get the error message "Could not open ... because of a program error". When this error occurs, it is possible to open the images if they are compressed using a different algorithm. Adobe developer Chris Cox is said to have claimed that a Microsoft
compiler bug in the CS version is the reason for this error. It should be partly solved in CS2.

Defining the exact size of a file that produces this kind of error is difficult. According to Erik Krause the bug has something to do with a wrong type cast from 16 to 32 bit integer, watch out for layer size, channel size, pixel size...

Changing the compression can be done with any program that can open the file and save it back (caution! some image viewers - IrfanView f.e. - silently degrade 16 bit [[TIFF]]s to 8 bit). A more convenient choice is to use [[ImageMagick]] together with Erik Krauses batch file [http://www.erik-krause.de/ttt/index.htm] for [[TIFF]] conversion.

There might be problems using LZW compression due to patent issues - although the patent should have exired in all countries by now (see [http://www.unisys.com/about__unisys/lzw/] for details). If this is the case, try no compression or ZIP compression. Newer versions of [[ImageMagick]] are not limited anymore.

== Resizing introduces a visible seam line ==

Up to Photoshop CS 2 this is a common problem on both platforms. It only happens when a file is not reduced to the background layer (or flattend) prior to resizing. Before flattening make sure you have saved a copy of your layers file (normally a [[PSD]] or [[PSB]]) when you think you might need those layers again.

[[Category:Software:Platform:Windows]][[Category:Software:Platform:Mac OS X]]

← Older revision		Revision as of 11:05, 25 May 2007
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	This article covers bugs and limitations of the widely used application [[Photoshop]] and hopefully their workarounds. Some problems are '''system''' specific (different flavours of Mac OS and Windows), some are found in a certain '''program version''' (like Photoshop Elements, 7.x, 8.x aka CS or 9.x aka CS2) or '''file type''' specific (e.g. 16 bit TIFF files with [[alpha channel\|alpha masks]]). Some of the workarounds might advise to use a different application for a certain task.		This article covers bugs and limitations of the widely used application [[Photoshop]] and hopefully their workarounds. Some problems are '''system''' specific (different flavours of Mac OS and Windows), some are found in a certain '''program version''' (like Photoshop Elements, 7.x, 8.x aka CS or 9.x aka CS2) or '''file type''' specific (e.g. 16 bit TIFF files with [[alpha channel\|alpha masks]]). Some of the workarounds might advise to use a different application for a certain task.
−
−	~~: <small>Carl von Einem [[User:Zarl\|Zarl]] 04:17, 28 Oct 2005 (EDT)</small>~~

	== Opening large TIFFs with Photoshop ==		== Opening large TIFFs with Photoshop ==

@@ Line 14: / Line 14: @@
 == Resizing introduces a visible seam line ==
-Up to Photoshop CS 2 this is a common problem on both platforms. It only happens when a file is not reduced to the background layer (or flattend) prior to resizing. Before flattening make sure you have saved a copy of your layers file (normally a [[PSD]] or [[PSB]]) when you think you might need those layers again. To restore your photos you can use [http://mackeeper.zeobit.com/mac-photo-recovery mac photo recovery] tool.
+Up to Photoshop CS 2 this is a common problem on both platforms. It only happens when a file is not reduced to the background layer (or flattend) prior to resizing. Before flattening make sure you have saved a copy of your layers file (normally a [[PSD]] or [[PSB]]) when you think you might need those layers again.
 [[Category:Software:Platform:Windows]]
 [[Category:Software:Platform:Mac OS X]]

@@ Line 1: / Line 1: @@
 This article covers bugs and limitations of the widely used application [[Photoshop]] and hopefully their workarounds. Some problems are '''system''' specific (different flavours of Mac OS and Windows), some are found in a certain '''program version''' (like Photoshop Elements, 7.x, 8.x aka CS or 9.x aka CS2) or '''file type''' specific (e.g. 16 bit TIFF files with [[alpha channel|alpha masks]]). Some of the workarounds might advise to use a different application for a certain task.
@@ Line 18: / Line 16: @@
 Up to Photoshop CS 2 this is a common problem on both platforms. It only happens when a file is not reduced to the background layer (or flattend) prior to resizing. Before flattening make sure you have saved a copy of your layers file (normally a [[PSD]] or [[PSB]]) when you think you might need those layers again.
-[[Category:Software:Platform:Windows]][[Category:Software:Platform:Mac OS X]]
+[[Category:Software:Platform:Windows]]

@@ Line 14: / Line 14: @@
 Changing the compression can be done with any program that can open the file and save it back (caution! some image viewers - IrfanView f.e. - silently degrade 16 bit [[TIFF]]s to 8 bit). A more convenient choice is to use [[ImageMagick]] together with Erik Krauses batch file [http://www.erik-krause.de/ttt/index.htm] for [[TIFF]] conversion.
-There might be problems using LZW compression due to patent issues - although the patent should have exired in all countries by now (see [http://www.unisys.com/about__unisys/lzw/] for details). If this is the case, try no compression or ZIP compression. Newer versions of [[ImageMagick]] are not limited anymore.
+There might be problems using LZW compression due to patent issues - although the patent should have expired in all countries by now (see [http://www.unisys.com/about__unisys/lzw/] for details). If this is the case, try no compression or ZIP compression. Newer versions of [[ImageMagick]] are not limited anymore.
 == Resizing introduces a visible seam line ==

@@ Line 1: / Line 1: @@
 == Page description ==
-This article covers bugs and limitations of the widely used application [[Photoshop]] and hopefully their workarounds. Some problems are '''system''' specific (different flavours of Mac OS and Windows), some are found in a certain '''program version''' (like Photoshop Elements, 7.x, 8.x aka CS or 9.x aka CS2) or '''file type''' specific (e.g. 16 bit TIFF files with alpha masks). Some of the workarounds might advise to use a different application for a certain task.
+This article covers bugs and limitations of the widely used application [[Photoshop]] and hopefully their workarounds. Some problems are '''system''' specific (different flavours of Mac OS and Windows), some are found in a certain '''program version''' (like Photoshop Elements, 7.x, 8.x aka CS or 9.x aka CS2) or '''file type''' specific (e.g. 16 bit TIFF files with [[alpha channel|alpha masks]]). Some of the workarounds might advise to use a different application for a certain task.
 : <small>Carl von Einem [[User:Zarl|Zarl]] 04:17, 28 Oct 2005 (EDT)</small>

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