User:Tohline/vtk/ColorLookupTablea - Revision history

Tohline: /* Related Discussions */ Link to Vistrails documentation

2014-04-27T00:34:47Z

Related Discussions: Link to Vistrails documentation

← Older revision		Revision as of 00:34, 27 April 2014
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	* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]		* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]
	* vtk colors by name — for example, tomato, plum, & orchid		* vtk colors by name — for example, tomato, plum, & orchid
			** [http://new-vistrails.googlecode.com/svn/core/utils/color.py VisTrails' new ColorByName class]
	** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html vtk's official website]		** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html vtk's official website]
	** [http://www.w3.org/TR/css3-color/#svg-color w3 specification]		** [http://www.w3.org/TR/css3-color/#svg-color w3 specification]
	** [http://en.wikipedia.org/wiki/Web_colors Wikipedia Discussion]		** [http://en.wikipedia.org/wiki/Web_colors Wikipedia Discussion]
	** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]		** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]

Tohline: /* Related Discussions */ Add link to w3 color-by-name

2014-04-27T00:00:04Z

Related Discussions: Add link to w3 color-by-name

← Older revision		Revision as of 00:00, 27 April 2014
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	* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]		* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]
	* vtk colors by name — for example, tomato, plum, & orchid		* vtk colors by name — for example, tomato, plum, & orchid
	** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html ~~Official~~ website]		** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html vtk's official website]
			** [http://www.w3.org/TR/css3-color/#svg-color w3 specification]
	** [http://en.wikipedia.org/wiki/Web_colors Wikipedia Discussion]		** [http://en.wikipedia.org/wiki/Web_colors Wikipedia Discussion]
	** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]		** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]

Tohline: /* Related Discussions */ Wikipedia color-by-name page

2014-04-26T23:58:23Z

Related Discussions: Wikipedia color-by-name page

← Older revision		Revision as of 23:58, 26 April 2014
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	* vtk colors by name — for example, tomato, plum, & orchid		* vtk colors by name — for example, tomato, plum, & orchid
	** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html Official website]		** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html Official website]
			** [http://en.wikipedia.org/wiki/Web_colors Wikipedia Discussion]
	** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]		** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]

Tohline: /* Related Discussions */ Official color-by-name website

2014-04-26T23:54:04Z

Related Discussions: Official color-by-name website

← Older revision		Revision as of 23:54, 26 April 2014
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	* [[User:Tohline/vtk/SimpleCubeTutorial\|Simple Cube Tutorial]]		* [[User:Tohline/vtk/SimpleCubeTutorial\|Simple Cube Tutorial]]
	* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]		* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]
	* [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html ~~vtk colors by name~~] ~~— for example, tomato, plum, & orchid~~		* vtk colors by name — for example, tomato, plum, & orchid
			** [http://www.vtk.org/Wiki/VTK/Examples/Python/Visualization/VTKNamedColorPatches_html Official website]
			** [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html Archaic reference]

Tohline: /* Related Discussions */ Add link to colors by name

2014-04-26T23:30:31Z

Related Discussions: Add link to colors by name

← Older revision		Revision as of 23:30, 26 April 2014
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	* [[User:Tohline/vtk/SimpleCubeTutorial\|Simple Cube Tutorial]]		* [[User:Tohline/vtk/SimpleCubeTutorial\|Simple Cube Tutorial]]
	* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]		* [[User:Tohline/vtk/SimpleCubeTutorial/CubeDetails#Cube_Definition_Details\|Cube Definition Details]]
			* [http://www.vtk.org/pipermail/vtkusers/1999-December/002899.html vtk colors by name] — for example, tomato, plum, & orchid

Tohline: /* Generating a Broad Range of Color Table */ Add link to WPI class notes

2014-04-26T22:16:51Z

Generating a Broad Range of Color Table: Add link to WPI class notes

← Older revision		Revision as of 22:16, 26 April 2014
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	===Generating a Broad Range of Color Table===		===Generating a Broad Range of Color Table===
	Here we will illustrate how to use VisTrail's "vtkLookupTable" module to readily generate a broad range of color tables. For tutorial purposes we will use the "rainbow.vt" vistrail (see …/examples/vtk_examples/Rendering/rainbow.vt) so that immediate parallels can be drawn between our presentation and the explanation of Color Maps that is provided by [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)] — see their Figure 6-3 and the related code development presented in their §6.6 (especially pp. 196 - 197).		Here we will illustrate how to use VisTrail's "vtkLookupTable" module to readily generate a broad range of color tables. For tutorial purposes we will use the "rainbow.vt" vistrail (see …/examples/vtk_examples/Rendering/rainbow.vt) so that immediate parallels can be drawn between our presentation and the explanation of Color Maps that is provided by [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)] — see their Figure 6-3 and the related code development presented in their §6.6 (especially pp. 196 - 197). A closely related, informative presentation can be found under the subsection labeled "Backing up -- a Colormap" within [http://web.cs.wpi.edu/~matt/courses/cs563/talks/vtk/visualization.html Matthew Ward's posted computer science class lecture notes at Worcester Polytechnic Institute].

	<div align="center">		<div align="center">

Tohline: /* Generating a Broad Range of Color Table */ Add link to default lookup table reference

2014-04-25T01:48:09Z

Generating a Broad Range of Color Table: Add link to default lookup table reference

← Older revision		Revision as of 01:48, 25 April 2014
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	<font color="blue">Rainbow image A2:</font>		<font color="blue">Rainbow image A2:</font>
	* The rendering that appears in the bottom left-hand corner of the above "Rainbow Color Maps" figure (''i.e.,'' VisTrails spreadsheet image A1) was generated using VTK's ''default'' color table.		* The rendering that appears in the bottom left-hand corner of the above "Rainbow Color Maps" figure (''i.e.,'' VisTrails spreadsheet image A1) was generated using [[User:Tohline/vtk/SimpleCubeTutorial#Deciphering_VTK.27s_default_Lookup_Table\|VTK's ''default'' color table]].
	** Image A2 can be generated by selecting/highlighting the "vtkLookupTable" module, deleting the "SetNumberOfColors" method and all 256 "SetTableValue" methods from the VisTrails ''Set Methods'' window, then re-executing the pipeline. (Not recommended, as this is hardly worth the effort!)		** Image A2 can be generated by selecting/highlighting the "vtkLookupTable" module, deleting the "SetNumberOfColors" method and all 256 "SetTableValue" methods from the VisTrails ''Set Methods'' window, then re-executing the pipeline. (Not recommended, as this is hardly worth the effort!)
	** Image A2 can more simply be generated by disconnecting the "vtkLookupTable" module from the "vtkPolyDataMapper" module then re-executing the pipeline.		** Image A2 can more simply be generated by disconnecting the "vtkLookupTable" module from the "vtkPolyDataMapper" module then re-executing the pipeline.

Tohline: /* Color Lookup Tables */ Add link to phrase "VTK default color lookup table"

2014-04-25T00:48:03Z

Color Lookup Tables: Add link to phrase "VTK default color lookup table"

← Older revision		Revision as of 00:48, 25 April 2014
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	This presentation is intended to accompany the [[User:Tohline/vtk/SimpleCubeTutorial\|"Simple Cube" tutorial]] that we have written as an aid for individuals who are trying to fully utilize the capabilities of VisTrails in their research. It is intended to build upon the information that can be obtained from the [http://www.kitware.com/products/books/vtkguide.html ''VTK User's Guide,'' authored and published by Kitware, Inc.]		This presentation is intended to accompany the [[User:Tohline/vtk/SimpleCubeTutorial\|"Simple Cube" tutorial]] that we have written as an aid for individuals who are trying to fully utilize the capabilities of VisTrails in their research. It is intended to build upon the information that can be obtained from the [http://www.kitware.com/products/books/vtkguide.html ''VTK User's Guide,'' authored and published by Kitware, Inc.]

	In our [[User:Tohline/vtk/SimpleCubeTutorial#Constructing_a_More_Sophisticated_Cube\|accompanying discussion]], we have explained how VTK's ''default color table'' can be relied upon to assign colors to POLYGONS, based on the scalar values with which each POLYGON has been labeled. Then, following an example used in the [http://www.kitware.com/products/books/vtkguide.html ''VTK User's Guide''], we have explained how [[User:Tohline/vtk/SimpleCubeTutorial#Specifying_Colors_of_Cell_Faces_via_a_User-defined_Color_Table\|the user can define his/her own color table]] inside of an input file that adheres to the ''Simple Legacy Format.'' By way of illustration, the following short LOOKUP_TABLE has been extracted from [[User:Tohline/vtk/SimpleCubeTutorial#Specifying_Colors_of_Cell_Faces_via_a_User-defined_Color_Table\|Example E in our accompanying discussion]]:		In our [[User:Tohline/vtk/SimpleCubeTutorial#Constructing_a_More_Sophisticated_Cube\|accompanying discussion]], we have explained how [[User:Tohline/vtk/SimpleCubeTutorial#Deciphering_VTK.27s_default_Lookup_Table\|VTK's ''default color table'']] can be relied upon to assign colors to POLYGONS, based on the scalar values with which each POLYGON has been labeled. Then, following an example used in the [http://www.kitware.com/products/books/vtkguide.html ''VTK User's Guide''], we have explained how [[User:Tohline/vtk/SimpleCubeTutorial#Specifying_Colors_of_Cell_Faces_via_a_User-defined_Color_Table\|the user can define his/her own color table]] inside of an input file that adheres to the ''Simple Legacy Format.'' By way of illustration, the following short LOOKUP_TABLE has been extracted from [[User:Tohline/vtk/SimpleCubeTutorial#Specifying_Colors_of_Cell_Faces_via_a_User-defined_Color_Table\|Example E in our accompanying discussion]]:

	<div align="center">		<div align="center">

Tohline: /* Generating a Broad Range of Color Table */ Explain "rainbow" images A1 and B1

2014-03-25T00:36:23Z

Generating a Broad Range of Color Table: Explain "rainbow" images A1 and B1

← Older revision		Revision as of 00:36, 25 March 2014
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	** Image A2 can also be generated by disconnecting the "vtkLookupTable" module from the "vtkPolyDataMapper" module, creating (by dragging & dropping) a new "vtkLookupTable" module into the pipeline window and connecting it to the "vtkPolyDataMapper" module, then re-executing the pipeline.		** Image A2 can also be generated by disconnecting the "vtkLookupTable" module from the "vtkPolyDataMapper" module, creating (by dragging & dropping) a new "vtkLookupTable" module into the pipeline window and connecting it to the "vtkPolyDataMapper" module, then re-executing the pipeline.

	<font color="blue">Rainbow ~~images~~ A1 & B1:</~~font~~>		Drawing on the design and capabilities of the VTK library, VisTrails' "vtkLookupTable" module most broadly facilitates the creation of color maps using HSVA (''i.e.,'' hue, saturation, value, & alpha opacity value) specifications. As [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)] explain (see p. 196), the procedure for generating lookup table entries is to define pairs of values for HSVA. These pairs define a linear ramp for hue, saturation, value, and opacity and, in turn, these linear ramps are used to generate a table with the number of table entries requested. VTK and, in turn, VisTrails, adopts the following ''default'' HSVA specifications: SetHueRange (0,2/3), SetSaturationRange (1,1), SetValueRange (1,1), & SetAlphaRange (1,1); and the ''default'' size of the color table is SetNumberOfColors(256).

			<font color="blue">Rainbow image B1:</font>
			* The rendering that appears in the top right-hand corner of the above "Rainbow Color Maps" figure (''i.e.,'' VisTrails spreadsheet image B1) was generated by VisTrails after the methods shown in the following table were activated inside the "vtkLookupTable" module.
			<table border="1" cellpadding="5" align="center">
			<tr>
			<td align="center">
			C++ Code Using VTK Routines Directly<br>
			<font size="-2">
			[see p. 196 of [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)]]
			</font>
			</td>
			<td align="center">
			Equivalent '''VisTrails'''<br>
			Set Methods Window
			</td>
			</tr>
			<tr>
			<td align="left">
			<pre>
			vtkLookupTable *lut=vtkLookupTable::New();
			lut->SetHueRange(0.66667, 0.0);
			lut->SetSaturationRange(1.0, 1.0);
			lut->SetValueRange(1.0, 1.0);
			lut->SetAlphaRange(1.0, 1.0);
			lut->SetNumberOfColors(256);
			lut->Build();
			</pre>
			<br>
			<br> <br> <br> <br> <br>
			<br> <br>
			</td>
			<td align="center">
			[[Image:RainbowImageB1A.png\|150px\|Set Methods B1A]]
			</td>
			</tr>
			<tr>
			<td align="left">
			<pre>
			vtkLookupTable *lut=vtkLookupTable::New();
			lut->SetHueRange(0.66667, 0.0);
			lut->Build();
			</pre>
			</td>
			<td align="center">
			[[Image:RainbowImageB1B.png\|150px\|Set Methods B1B]]
			</td>
			</tr>
			</table>


			<font color="blue">Rainbow image A1:</font>
			* The rendering that appears in the top left-hand corner of the above "Rainbow Color Maps" figure (''i.e.,'' VisTrails spreadsheet image A1) was generated by VisTrails after the methods shown in the following table were activated inside the "vtkLookupTable" module.
			<table border="1" cellpadding="5" align="center">
			<tr>
			<td align="center">
			C++ Code Using VTK Routines Directly<br>
			<font size="-2">
			[see p. 196 of [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)]]
			</font>
			</td>
			<td align="center">
			Equivalent '''VisTrails'''<br>
			Set Methods Window
			</td>
			</tr>
			<tr>
			<td align="left">
			<pre>
			vtkLookupTable *lut=vtkLookupTable::New();
			lut->SetHueRange(0.0, 0.0);
			lut->SetSaturationRange(0.0, 0.0);
			lut->SetValueRange(0.0, 1.0);
			</pre>
			<br> <br> <br> <br> <br>
			</td>
			<td align="center">
			[[Image:RainbowImageA1.png\|150px\|Set Methods A1]]
			</td>
			</tr>
			</table>

	=Related Discussions=		=Related Discussions=

Tohline: /* Generating a Broad Range of Color Table */ Explain bottom two images in "rainbow" figure

2014-03-24T22:35:39Z

Generating a Broad Range of Color Table: Explain bottom two images in "rainbow" figure

← Older revision		Revision as of 22:35, 24 March 2014
Line 51:		Line 51:

	===Generating a Broad Range of Color Table===		===Generating a Broad Range of Color Table===
	Here we will illustrate how to use VisTrail's "vtkLookupTable" module to readily generate a broad range of color tables. For tutorial purposes we will use the "rainbow.vt" vistrail ~~because~~ immediate parallels can be drawn between our presentation and the explanation of Color Maps that is provided by [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)] — see ~~especially~~ their Figure 6-3 and the related code development presented in their §6.6 (~~specifically,~~ pp. 196 - 197).		Here we will illustrate how to use VisTrail's "vtkLookupTable" module to readily generate a broad range of color tables. For tutorial purposes we will use the "rainbow.vt" vistrail (see …/examples/vtk_examples/Rendering/rainbow.vt) so that immediate parallels can be drawn between our presentation and the explanation of Color Maps that is provided by [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)] — see their Figure 6-3 and the related code development presented in their §6.6 (especially pp. 196 - 197).

	<div align="center">		<div align="center">
	<table border="2" cellpadding="3">		<table border="2" cellpadding="3" width="80%">
	<tr>		<tr>
	<th align="center">		<th align="center">
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	<td align="center">		<td align="center">
	[[Image:RainbowFigure6-3.png\|700px\|Illustrating Rainbow Color Maps]]		[[Image:RainbowFigure6-3.png\|700px\|Illustrating Rainbow Color Maps]]
			</td>
			</tr>
			<tr>
			<td align="left">
			Snapshot of a two-by-two VisTrails spreadsheet generated using the "rainbow.vt" vistrail, for comparison with Figure 6-3 of [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, & Lorensen (2006)]
	</td>		</td>
	</tr>		</tr>
	</table>		</table>
	</div>		</div>

			<font color="blue">Rainbow image B2:</font>
			* When the "rainbow.vt" vistrail is loaded and executed without any alterations, the VisTrails pipeline will render the image that appears in the bottom right-hand corner of the above "Rainbow Color Maps" figure — as displayed, it is image B2 in the VisTrails spreadsheet. Selecting/highlighting the "vtkLookupTable" module in the initial pipeline will reveal that the color table used to generate this image was constructed by brute force, as discussed above; the ''Methods'' window contains 256 individually specified colors! (Be patient. After clicking on the "vtkLookupTable" module that exists as part of the default "rainbow" pipeline, VisTrails will spin its wheels and be unresponsive for 10 or more seconds as it loads the extensive set of methods.)

			<font color="blue">Rainbow image A2:</font>
			* The rendering that appears in the bottom left-hand corner of the above "Rainbow Color Maps" figure (''i.e.,'' VisTrails spreadsheet image A1) was generated using VTK's ''default'' color table.
			** Image A2 can be generated by selecting/highlighting the "vtkLookupTable" module, deleting the "SetNumberOfColors" method and all 256 "SetTableValue" methods from the VisTrails ''Set Methods'' window, then re-executing the pipeline. (Not recommended, as this is hardly worth the effort!)
			** Image A2 can more simply be generated by disconnecting the "vtkLookupTable" module from the "vtkPolyDataMapper" module then re-executing the pipeline.
			** Image A2 can also be generated by disconnecting the "vtkLookupTable" module from the "vtkPolyDataMapper" module, creating (by dragging & dropping) a new "vtkLookupTable" module into the pipeline window and connecting it to the "vtkPolyDataMapper" module, then re-executing the pipeline.

			<font color="blue">Rainbow images A1 & B1:</font>

	=Related Discussions=		=Related Discussions=