<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Intensity Transformation Tables</TITLE> <META NAME="description" CONTENT="Intensity Transformation Tables"> <META NAME="keywords" CONTENT="vol1"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol1.css"> <LINK REL="next" HREF="node105.html"> <LINK REL="previous" HREF="node103.html"> <LINK REL="up" HREF="node100.html"> <LINK REL="next" HREF="node105.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html1837" HREF="node105.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html1833" HREF="node100.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html1827" HREF="node103.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html1835" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <A NAME="tex2html1836" HREF="node216.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="icons.gif/index_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html1838" HREF="node105.html">Graphics</A> <B> Up:</B> <A NAME="tex2html1834" HREF="node100.html">XWindow display</A> <B> Previous:</B> <A NAME="tex2html1828" HREF="node103.html">Look-Up Tables</A> <BR> <BR> <!--End of Navigation Panel--> <H3><A NAME="SECTION001021400000000000000"> </A> <A NAME="x-image-transformation-tables"> </A> <BR> Intensity Transformation Tables </H3> In addition to a LUT you can also apply an intensity transformation table which maps pixels through a table before using them as LUT index. Using ITTs enables you to apply modifications to the displayed image without actually changing the data in the image channels. The ITTs are emulated by convolving the ITT values with the current LUT. Like for LUTs, interactive modification of an ITT is done via the <I>arrow</I> keys. <BR> The main commands which control the ITT functions are: <BR> <BR> <TT>LOAD/ITT</TT> - <I>load an ITT </I> <BR> <TT>GET/ITT</TT> - <I>read back an ITT </I> <BR> <TT>MODIFY/ITT</TT> - <I>modify the ITT interactively </I> <BR> <TT>CLEAR/ITT</TT> - <I>bypass the ITT</I> <BR> <TT>SET/ITT</TT> - <I>pass through an ITT</I> <BR> <BR> To display the ITT, use <TT>DISPLAY/LUT</TT> which shows the combined effect of LUT and ITT. Some of the currently available ITT tables are:<BLOCKQUOTE> <TT><TT>ramp</TT> <BR> <TT>neg</TT> <BR> <TT>expo</TT> <BR> <TT>log</TT> <BR> <TT>neglog</TT> <BR> <TT>jigsaw</TT> <BR> <TT>staircase</TT></TT></BLOCKQUOTE>With the command <TT>TUTORIAL/ITT</TT> you can see the effect of ITTs and modify the ITTs interactively. <P> <BR><HR> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-09</I> </ADDRESS> </BODY> </HTML>
