Halo - Revision history

Erik Krause: areas->seams

2008-05-04T15:17:46Z

areas->seams

Erik Krause: restored visibility

2007-11-17T23:19:21Z

restored visibility

Erik Krause: Prepared for new glossary template

2007-11-17T23:17:09Z

Prepared for new glossary template

Bruno: link to future sharpening page

2007-01-18T22:05:18Z

link to future sharpening page

WikiSysop: 1 revision(s)

2006-07-13T20:28:01Z

1 revision(s)

WikiSysop: 1 revision(s)

2006-07-13T19:56:39Z

1 revision(s)

Erik Krause: Basic page

2005-12-10T20:54:45Z

Basic page

Erik Krause: Basic page

2005-12-10T20:54:45Z

Basic page

New page

'''Halo''' reffers to light and/or dark areas along strong contrast edges often caused by certain image manipulations. Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''Unsharp Mask'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.

Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.

[[Image:halo-unmodified-example.jpg|frame|left|Unmodified image]][[Image:halo-example.jpg|frame|left|Heavy halos due to wrong use of ''Shadow/Highlight'' and ''Unsharp Mask'']][[Image:no-halo-example.jpg|frame|left|No halos with Contrast Masking Actions and higher radius ''Unsharp Mask'']]

[[Category:Glossary]]

← Older revision		Revision as of 15:17, 4 May 2008
Line 1:		Line 1:
−	'''Halo''' refers to {{Glossary\|light and/or dark ~~areas~~ along strong contrast edges often caused by certain image manipulations.\|1}} Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.	+	'''Halo''' refers to {{Glossary\|light and/or dark seams along strong contrast edges often caused by certain image manipulations.\|1}} Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.

	Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.		Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.

← Older revision		Revision as of 23:19, 17 November 2007
Line 1:		Line 1:
−	'''Halo''' refers to {{Glossary\|light and/or dark areas along strong contrast edges often caused by certain image manipulations.}} Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.	+	'''Halo''' refers to {{Glossary\|light and/or dark areas along strong contrast edges often caused by certain image manipulations.\|1}} Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.

	Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.		Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.

← Older revision		Revision as of 23:17, 17 November 2007
Line 1:		Line 1:
−	'''Halo''' ~~reffers~~ to light and/or dark areas along strong contrast edges often caused by certain image manipulations. Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.	+	'''Halo''' refers to {{Glossary\|light and/or dark areas along strong contrast edges often caused by certain image manipulations.}} Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.

	Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.		Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.

← Older revision		Revision as of 22:05, 18 January 2007
Line 1:		Line 1:
−	'''Halo''' reffers to light and/or dark areas along strong contrast edges often caused by certain image manipulations. Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''Unsharp Mask'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.	+	'''Halo''' reffers to light and/or dark areas along strong contrast edges often caused by certain image manipulations. Most operations that modify local contrast tend to produce halos, such as f.e. in [[photoshop ]] ''Shadows/Highlights'' or ''[[sharpening\|Unsharp Mask]]'' with a high radius as it is often used for contrast enhancement. Some [[HDR compression]] tools show haloing, too.

	Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.		Haloing can be avoided by either not using this tools or use other ones with edge preserving blurring algorithms which do not produce halos, like the [[Contrast Masking Actions]] do. Here an example with darkened sky. One with ''Shadow/Highlight'' and ''Unsharp Mask'' with a too low radius of 30 pixels and one with Contrast Masking Actions and ''Unsharp Mask'' with a higher radius of 70 pixels.

← Older revision	Revision as of 20:28, 13 July 2006
(One intermediate revision by one user not shown)