Color Profile - Revision history

Patapom at 18:24, 15 January 2012

2012-01-15T18:24:55Z

2012-01-15T18:24:12Z

2012-01-15T17:48:58Z

2012-01-15T15:38:23Z

2012-01-15T15:36:36Z

2012-01-04T13:18:41Z

2012-01-03T16:18:04Z

2012-01-01T19:06:10Z

2012-01-01T19:05:48Z

2012-01-01T19:04:28Z

← Older revision		Revision as of 18:24, 15 January 2012
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	==TIFF==		==TIFF==

−	'''IMPORTANT''': TIFF images are pre-multiplied by their alpha channel ! (cf. [http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf TIFF Specs] v6 Section 18)	+	'''IMPORTANT''': TIFF images are pre-multiplied by their alpha channel ! (cf. [http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf TIFF Specs v6] Section 18)

← Older revision		Revision as of 18:24, 15 January 2012
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	==TIFF==		==TIFF==
		+
		+	'''IMPORTANT''': TIFF images are pre-multiplied by their alpha channel ! (cf. [http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf TIFF Specs] v6 Section 18)
		+

	===Metadata===		===Metadata===

← Older revision		Revision as of 17:48, 15 January 2012
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	=Working with Photoshop=		=Working with Photoshop=
		+
		+
		+	'''IMPORTANT''':
		+	* For PNGs, the color profile is always stored as a '''/cHRM''' metadata that can easily be read back to obtain a standard color profile, even though there is no explicit profile name embedded as meta.
		+	* For other formats like JPG or TIFF, always enable the "ICC profile" option in the save dialog otherwise there is no way to determine the image's color profile when reloading the bitmap in a 3D application and it can be quite wrong if you assume sRGB by default whereas Photoshop working profile is Adobe RGB or ProPhoto!
		+	[[File:AlwaysCheckTheICCProfile.png\|400px\|center\|Always check the ICC Profile option]]

@@ Line 326: / Line 326: @@
 * '''/sRGB''' (short)
-** Defines the sRGB profile. The specified value is the [[Color_Profile#Rendering_Intent|Rendering Intent]].
+** Defines the sRGB profile. The specified value is the [[Colorimetry#Rendering_Intent|Rendering Intent]].
 * '''/gAMA''' (short)

@@ Line 295: / Line 295: @@
 ==JPEG==
-Wrong choice, lossy, not linear
+Wrong choice, lossy, gamma 2.2, supports multiple profiles like Adobe and ProPhoto though, not only sRGB
 ==PNG==
 ===8 Bits===
 ===16 Bits===
 ==TIFF==
 ==BMP==
 No metadata ! OLD and lame ! Don't use !
 ==TGA==
 No metadata ! Saves in linear space => Only use for linear space images (normal maps, ambient occlusion, specular shininess, etc.)

← Older revision		Revision as of 13:18, 4 January 2012
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	* '''ICC profiles''' for each device (i.e. printer, scanner, monitor, digital camera, etc.) that will accurately describe the unique color characteristics of each device.		* '''ICC profiles''' for each device (i.e. printer, scanner, monitor, digital camera, etc.) that will accurately describe the unique color characteristics of each device.
	* A '''Color Matching Module (CMM)''' that will interpret the information contained within the device profiles and carry out the instructions on how the color characteristics of each device should be treated.		* A '''Color Matching Module (CMM)''' that will interpret the information contained within the device profiles and carry out the instructions on how the color characteristics of each device should be treated.
		+
		+
		+	If you need to take a look at a CMS then you can check [http://www.littlecms.com/ Little CMS], the open source CMS by Marti Maria.

@@ Line 29: / Line 29: @@
 * A '''Color Matching Module (CMM)''' that will interpret the information contained within the device profiles and carry out the instructions on how the color characteristics of each device should be treated.
 ==Profile Connection Space==
 In the terminology of the [http://www.color.org International Color Consortium], a translation between two color spaces can go through a ''profile connection space'' (PCS).

@@ Line 28: / Line 28: @@
 * '''ICC profiles''' for each device (i.e. printer, scanner, monitor, digital camera, etc.) that will accurately describe the unique color characteristics of each device.
 * A '''Color Matching Module (CMM)''' that will interpret the information contained within the device profiles and carry out the instructions on how the color characteristics of each device should be treated.
@@ Line 218: / Line 225: @@
 |style="border-style: solid; border-width: 0 0 0 0"| 0.3290
 |}

@@ Line 223: / Line 223: @@
 In the terminology of the [http://www.color.org International Color Consortium], a translation between two color spaces can go through a ''profile connection space'' (PCS).
-The connection space can thus be the ''Working'' or ''Reference'' color space mentioned at the beginning of this article.
+The connection space can thus be the ''Working'' or ''Reference'' color space of a [[Color_Profile#Color_Management|Color Management System]] as mentioned at the beginning of this article.
 Color Space 1 &rarr; PCS ([[Colorimetry#CIE_LAB|CIELAB]] or [[Colorimetry#CIE_XYZ|CIEXYZ]]) &rarr; Color space 2; conversions into and out of the PCS are each specified by a profile.