101 lines
4.5 KiB
HTML
Executable File
101 lines
4.5 KiB
HTML
Executable File
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>timage</title>
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<meta http-equiv="content-type"
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content="text/html; charset=ISO-8859-1">
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<meta name="author" content="Graeme Gill">
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</head>
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<body>
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<h2><b>render/timage</b></h2>
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<h3>Summary</h3>
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Create TIFF test image, suitable for evaluating various color
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transformations. By default a test image consisting of two hexagons and
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a grey wedge is produced. The two hexagons are the white and black
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corners of the RGB cube surface. This is useful in checking gamut
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mapping behaviour applied to an RGB colorspace.<br>
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<br>
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<img alt="RGB cube surface" src="cube.jpg"
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style="width: 200px; height: 101px;"><br>
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<br>
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An alternate rectangular "rainbow" representation of the surface
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of an RGB
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cube can also be created. <br>
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<br>
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<img alt="RGB rectangular surface" src="surface.jpg"
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style="width: 200px; height: 148px;"><br>
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<br>
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A third type is a set of stepped rectangles that explore the L*a*b*
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space, useful for testing profiles B2A tables (-p 6):<br>
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<br>
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<img alt="Lab steps image" src="LabSteps.jpg"
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style="width: 150px; height: 150px;"><br>
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<h3>Usage Summary</h3>
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<small><span style="font-family: monospace;"></span><span
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style="font-family: monospace;"></span><span
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style="font-family: monospace;">usage: timage [-options] outfile.tif</span><br
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style="font-family: monospace;">
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<span style="font-family: monospace;"> -v
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Verbose</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> -t
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Generate rectangular boundary test chart<br>
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-p steps Generate a colorspace step chart
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with L* steps^2<br style="font-family: monospace;">
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</span><span style="font-family: monospace;"> -r
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res Resolution
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in DPI (default 200)</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> -s
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Smooth blend</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> -x
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16 bit output</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> -g
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prop Percentage towards grey
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(default 0%)</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> outfile.tif Profile
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to check against</span></small><br>
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<h3>Usage Details and Discussion<br>
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</h3>
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The<b> -v</b> flag increases verbosity. <br>
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<br>
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The default behaviour is to create the two hexagon plus grey wedge test
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image. If the <span style="font-weight: bold;">-t</span> flag is used,
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the alternate single rectangular surface test image is generated.
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If the <span style="font-weight: bold;">-p steps</span> parameter is
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given, than an L*a*b* test chart is generated.<br>
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<br>
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The dots per inch of the image can be set using the <span
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style="font-weight: bold;">-r</span> parameter. Increasing this,
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increases the size and detail of the image.<br>
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<br>
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Normally the images are generated using linear blending of the RGB
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values. If the <span style="font-weight: bold;">-s</span> flag is
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used, a smoother blending is employed. This is most desirable when
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generating the rectangular test image.<br>
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<br>
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Normally an 8 bit per color component image is generated. If the <span
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style="font-weight: bold;">-x</span> flag is use, a 16 bit per color
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component image will be generated, giving smoother blends, particularly
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if a higher resolution (DPI) image is created.<br>
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<br>
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The hexagon and surface test images are normally the surface colors of
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the RGB colorspace
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cube. If a percentage greater than 0% is given as an argument to the <span
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style="font-weight: bold;">-g</span> option, a test chart composed of
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colors away from the RGB cube surface, towards the center grey point
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will be generated. 100% will generate a completely grey image. Values
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of 10, 20 to 50% are more usual.<br>
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<br>
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The L*a*b* step chart explores the range of L*a*b* values that are
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handled by an L*a*b* PCS B2A table, with the L* stepping from 0 to 100
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in steps from the top left to the bottom right square, while the a*
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values range from -127 to 127 left to right in each square, and the b*
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values range from -127 to 127 bottom to top in each square.<br>
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<br>
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The last argument on the command line is the name of the TIFF file to
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save the resulting image to.<br>
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<br>
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<br>
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<br>
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</body>
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</html>
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