Cleaned up definitions of point, integral point, graphics data, color channel, alpha channel, visual data format, premultiplied format, visual data element, pixel, raster graphics data, color model, additive color, RGB color model, RGBA color model, and color space.

Author: mikebmcl

source/terms-and-definitions.tex

@@ -19,23 +19,27 @@
 
 %%\def\definition{\definitionx{\section}}%
 
-\indexdefn{standard coordinate space}%
-\definition{standard coordinate space}{\iotwod.defns.stndcrdspace}
-Euclidean plane described by a Cartesian coordinate system where the first coordinate is measured along a horizontal axis, called the \xaxis, oriented from left to right, the second coordinate is measured along a vertical axis, called the \yaxis, oriented from top to bottom, and rotation of a point around the origin by a positive value expressed in radians is counterclockwise
-
 \indexdefn{point}%
 \definition{point}{\iotwod.defns.point}
-\defncontext{point} coordinate designated by a floating point \xaxis{} value and a floating point \yaxis{} value within the \term{standard coordinate space} (\ref{\iotwod.defns.stndcrdspace})
+coordinate designated by a floating-point \xaxis{} value and a floating-point \yaxis{} value
 
-\indexdefn{point}%
-\definition{point}{\iotwod.defns.point.integral}
-\defncontext{integral point} coordinate designated by an integral \xaxis{} value and an integral \yaxis{} value within the \term{standard coordinate space} (\ref{\iotwod.defns.stndcrdspace})
+\indexdefn{origin}%
+\definition{origin}{\iotwod.defns.origin}
+point with an \xaxis{} value of $0$ and a \yaxis{} value of $0$
+
+\indexdefn{standard coordinate space}%
+\definition{standard coordinate space}{\iotwod.defns.stndcrdspace}
+Euclidean plane described by a Cartesian coordinate system where the \xaxis{} is a horizontal axis oriented from left to right, the \yaxis{} is a vertical axis oriented from top to bottom, and rotation of a point, excluding the origin, around the origin by a positive value in radians is counterclockwise
+
+\indexdefn{integral point}%
+\definition{integral point}{\iotwod.defns.point.integral}
+point where the \xaxis{} value and the \yaxis{} value are integers
 
 \indexdefn{normalize}%
 \definition{normalize}{\iotwod.defns.normalize}
-map a closed set of evenly spaced values in the range $[0, x]$ to an evenly spaced sequence of floating point values in the range $[0, 1]$
+map a closed set of evenly spaced values in the range $[0, x]$ to an evenly spaced sequence of floating-point values in the range $[0, 1]$
 \begin{note}
-The definition of normalize given is the definition for normalizing unsigned input. Signed normalization, i.e. the mapping of a closed set of evenly spaced values in the range $[-x, x)$ to an evenly spaced sequence of floating point values in the range $[-1, 1]$ is not used in this \documenttypename{}.
+The definition of normalize given is the definition for normalizing unsigned input. Signed normalization, i.e. the mapping of a closed set of evenly spaced values in the range $[-x, x)$ to an evenly spaced sequence of floating-point values in the range $[-1, 1]$ is not used in this \documenttypename{}.
 \end{note}
 
 % The following may not be needed. Already defined in IEC 60050 723-05-05.
@@ -57,72 +61,72 @@
 
 \indexdefn{graphics data}%
 \definition{graphics data}{\iotwod.defns.graphicsdata}
-\defncontext{graphics data} \term{visual data} (\ref{\iotwod.defns.visdata}) stored in an unspecified form
+visual data stored in an unspecified form
 
-\indexdefn{channel}%
-\definition{channel}{\iotwod.defns.channel}
-%a bounded set of homogeneously-spaced real numbers in the range $[0,1]$
-component of \term{visual data} (\ref{\iotwod.defns.visdata}) with a defined bit size
+\indexdefn{color}%
+\definition{color}{\iotwod.defns.colorchannel}
+\defncontext{channel} component of visual data representing color
 
-\indexdefn{color channel}%
-\definition{color channel}{\iotwod.defns.colorchannel}
-component of \term{visual data} (\ref{\iotwod.defns.visdata}) representing color
+\indexdefn{alpha}%
+\definition{alpha}{\iotwod.defns.alphachannel}
+\defncontext{channel} component of visual data representing transparency
 
-\indexdefn{alpha channel}%
-\definition{alpha channel}{\iotwod.defns.alphachannel}
-component of \term{visual data} (\ref{\iotwod.defns.visdata}) representing transparency
+\indexdefn{channel}%
+\definition{channel}{\iotwod.defns.channel}
+color or alpha channel
 
 \indexdefn{visual data format}%
 \definition{visual data format}{\iotwod.defns.visdatafmt}
-specification that defines a total bit size, a set of one or more \term{channels} (\ref{\iotwod.defns.channel}), and each \term{channel}'s role, bit size, and location relative to the upper (high-order) bit
-%a specification of visual data channels which defines a total bit size for the format and each channel's role, bit size, and location relative to the upper (high-order) bit
-%\begin{note}
-%The total bit size may be larger than the sum of the bit sizes of the channels of the format.
-%\end{note}
+specification of zero or more color channels and zero or one alpha channels that defines each channel's role, bit size, location relative to the high-order bit, and the total bit size of all channels including unused bits
 
 \indexdefn{premultiplied format}%
 \definition{premultiplied format}{\iotwod.defns.premultipliedformat}
-format with \term{color channels} (\ref{\iotwod.defns.colorchannel}) and an \term{alpha channel} (\ref{\iotwod.defns.alphachannel}) where each \term{color channel} is \term{normalized} (\ref{\iotwod.defns.normalize}) and then multiplied by the \term{normalized} \term{alpha channel} value
+visual data format with one or more color channels and an alpha channel where each color channel is normalized and then multiplied by the normalized alpha channel value
 \begin{example}
 Given the 32-bit non-premultiplied RGBA pixel with 8 bits per channel \{255, 0, 0, 127\} (half-transparent red), when normalized it would become \{1.0f, 0.0f, 0.0f, 0.5f\}. As such, in premultiplied, normalized format it would become \{0.5f, 0.0f, 0.0f, 0.5f\} as a result of multiplying each of the three color channels by the alpha channel value.
 \end{example}
 
 \indexdefn{visual data element}%
 \definition{visual data element}{\iotwod.defns.visdataelem}
-item of \term{visual data} (\ref{\iotwod.defns.visdata}) with a defined \term{visual data format} (\ref{\iotwod.defns.visdatafmt})
+visual data with a defined visual data format
 
 % The following may not be needed. Already defined in IEC 60050 723-05-31
-\indexdefn{pixel}
+\indexdefn{pixel}%
 \definition{pixel}{\iotwod.defns.pixel}
-discrete, rectangular \term{visual data element} (\ref{\iotwod.defns.visdataelem})
-
-\indexdefn{graphics data}%
-\indexdefn{graphics data!raster}%
-\definition{graphics data}{\iotwod.defns.graphics.raster}
-\defncontext{raster graphics data} \term{visual data} (\ref{\iotwod.defns.visdata}) stored as \term{pixels} (\ref{\iotwod.defns.pixel}) that is accessible as-if it was an array of rows of pixels beginning with the pixel at the \term{integral point} $(0,0)$ (\ref{\iotwod.defns.point.integral})
+discrete visual data element
 
-\indexdefn{additive color}%
-\definition{additive color}{\iotwod.defns.additivecolor}
-color defined by the emissive intensity of its \term{color channels} (\ref{\iotwod.defns.colorchannel})
+\indexdefn{raster graphics data}%
+%\indexdefn{graphics data!raster}%
+%\definition{graphics data}{\iotwod.defns.graphics.raster}
+%\defncontext{raster graphics data} \term{visual data} (\ref{\iotwod.defns.visdata}) stored as \term{pixels} (\ref{\iotwod.defns.pixel}) that is accessible as-if it was an array of rows of pixels beginning with the pixel at the \term{integral point} $(0,0)$ (\ref{\iotwod.defns.point.integral})
+data comprised of a rectangular array of pixels where the top-left pixel is located at the origin and additional pixels are located as consecutive integral points of increasing value
 
 \indexdefn{color model}%
 \definition{color model}{\iotwod.defns.colormodel}
-ideal, mathematical representation of colors which often uses \term{color channels} (\ref{\iotwod.defns.colorchannel})
+ideal, mathematical representation of color
+
+\indexdefn{additive color}%
+\definition{additive color}{\iotwod.defns.additivecolor}
+color defined by the emissive intensity of its color channels
 
 \indexdefn{color model}%
 \indexdefn{color model!RGB}%
 \definition{RGB color model}{\iotwod.defns.rgbcolormodel}
-\defncontext{RGB} \term{additive} (\ref{\iotwod.defns.additivecolor}) \term{color model} (\ref{\iotwod.defns.colormodel}) using red, green, and blue \term{color channels} (\ref{\iotwod.defns.colorchannel})
+color model using additive color comprised of red, green, and blue color channels
 
 \indexdefn{color model}%
 \indexdefn{color model!RGBA}%
 \definition{RGBA color model}{\iotwod.defns.rgbacolormodel}
-\defncontext{RGBA} \term{RGB color model} (\ref{\iotwod.defns.rgbcolormodel}) with an \term{alpha channel} (\ref{\iotwod.defns.alphachannel})
+RGB color model with an alpha channel
+
+\indexdefn{color space}%
+\definition{color space}{\iotwod.defns.colorspace}
+systematic mapping of values to specific colors
 
 \indexdefn{color space}%
 \indexdefn{color space!sRGB}%
 \definition{sRGB color space}{\iotwod.defns.srgbcolorspace}
-\defncontext{sRGB} \term{additive} (\ref{\iotwod.defns.additivecolor}) \term{color space} (\ref{\iotwod.defns.colorspace}) defined in IEC 61966-2-1 that is based on an \term{RGB color model} (\ref{\iotwod.defns.rgbcolormodel})
+color space defined in IEC 61966-2-1 that is based on the RGB color model
 
 \indexdefn{start point}%
 \definition{start point}{\iotwod.defns.startpt}