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diff --git a/doc/timage.html b/doc/timage.html new file mode 100644 index 0000000..2daed27 --- /dev/null +++ b/doc/timage.html @@ -0,0 +1,100 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html> +<head> + <title>timage</title> + <meta http-equiv="content-type" + content="text/html; charset=ISO-8859-1"> + <meta name="author" content="Graeme Gill"> +</head> +<body> +<h2><b>render/timage</b></h2> +<h3>Summary</h3> +Create TIFF test image, suitable for evaluating various color +transformations. By default a test image consisting of two hexagons and +a grey wedge is produced. The two hexagons are the white and black +corners of the RGB cube surface. This is useful in checking gamut +mapping behaviour applied to an RGB colorspace.<br> +<br> +<img alt="RGB cube surface" src="cube.jpg" + style="width: 200px; height: 101px;"><br> +<br> + An alternate rectangular "rainbow" representation of the surface +of an RGB +cube can also be created. <br> +<br> +<img alt="RGB rectangular surface" src="surface.jpg" + style="width: 200px; height: 148px;"><br> +<br> +A third type is a set of stepped rectangles that explore the L*a*b* +space, useful for testing profiles B2A tables (-p 6):<br> +<br> +<img alt="Lab steps image" src="LabSteps.jpg" + style="width: 150px; height: 150px;"><br> +<h3>Usage Summary</h3> +<small><span style="font-family: monospace;"></span><span + style="font-family: monospace;"></span><span + style="font-family: monospace;">usage: timage [-options] outfile.tif</span><br + style="font-family: monospace;"> +<span style="font-family: monospace;"> -v +Verbose</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -t +Generate rectangular boundary test chart<br> + -p steps Generate a colorspace step chart +with L* steps^2<br style="font-family: monospace;"> +</span><span style="font-family: monospace;"> -r +res Resolution +in DPI (default 200)</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -s +Smooth blend</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -x +16 bit output</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -g +prop Percentage towards grey +(default 0%)</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> outfile.tif Profile +to check against</span></small><br> +<h3>Usage Details and Discussion<br> +</h3> +The<b> -v</b> flag increases verbosity. <br> +<br> +The default behaviour is to create the two hexagon plus grey wedge test +image. If the <span style="font-weight: bold;">-t</span> flag is used, +the alternate single rectangular surface test image is generated. +If the <span style="font-weight: bold;">-p steps</span> parameter is +given, than an L*a*b* test chart is generated.<br> +<br> +The dots per inch of the image can be set using the <span + style="font-weight: bold;">-r</span> parameter. Increasing this, +increases the size and detail of the image.<br> +<br> +Normally the images are generated using linear blending of the RGB +values. If the <span style="font-weight: bold;">-s</span> flag is +used, a smoother blending is employed. This is most desirable when +generating the rectangular test image.<br> +<br> +Normally an 8 bit per color component image is generated. If the <span + style="font-weight: bold;">-x</span> flag is use, a 16 bit per color +component image will be generated, giving smoother blends, particularly +if a higher resolution (DPI) image is created.<br> +<br> +The hexagon and surface test images are normally the surface colors of +the RGB colorspace +cube. If a percentage greater than 0% is given as an argument to the <span + style="font-weight: bold;">-g</span> option, a test chart composed of +colors away from the RGB cube surface, towards the center grey point +will be generated. 100% will generate a completely grey image. Values +of 10, 20 to 50% are more usual.<br> +<br> +The L*a*b* step chart explores the range of L*a*b* values that are +handled by an L*a*b* PCS B2A table, with the L* stepping from 0 to 100 +in steps from the top left to the bottom right square, while the a* +values range from -127 to 127 left to right in each square, and the b* +values range from -127 to 127 bottom to top in each square.<br> +<br> +The last argument on the command line is the name of the TIFF file to +save the resulting image to.<br> +<br> +<br> +<br> +</body> +</html> |