{"id":300,"date":"2009-11-12T18:14:09","date_gmt":"2009-11-12T18:14:09","guid":{"rendered":"https:\/\/blogs.mathworks.com\/steve\/2009\/11\/12\/maybe-truecolor-is-ok-after-all\/"},"modified":"2009-11-12T18:14:09","modified_gmt":"2009-11-12T18:14:09","slug":"maybe-truecolor-is-ok-after-all","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/steve\/2009\/11\/12\/maybe-truecolor-is-ok-after-all\/","title":{"rendered":"Maybe truecolor is OK after all"},"content":{"rendered":"<div xmlns:mwsh=\"https:\/\/www.mathworks.com\/namespace\/mcode\/v1\/syntaxhighlight.dtd\" class=\"content\">\r\n   <p><a href=\"https:\/\/blogs.mathworks.com\/steve\/2009\/11\/11\/im-looking-for-a-replacement-for-truecolor\/\">Yesterday I posted<\/a> that I was looking for a replacement for the term <i>truecolor<\/i>.  (I won't repeat the explanation here; take a look at the <a href=\"https:\/\/blogs.mathworks.com\/steve\/2009\/11\/11\/im-looking-for-a-replacement-for-truecolor\/\">original post<\/a>.)  Quite a few readers posted interesting and thoughtful ideas.\r\n   <\/p>\r\n   <p><a href=\"https:\/\/blogs.mathworks.com\/steve\/2009\/11\/11\/im-looking-for-a-replacement-for-truecolor\/#comment-22328\">Gene commented<\/a> and <a href=\"https:\/\/www.mathworks.com\/matlabcentral\/fileexchange\/authors\/35927\">Rob<\/a> sent me e-mail about the use of the term truecolor in remotely sensed imagery. I had been thinking about the term as defining\r\n      a form of representation: each pixel is a vector of color-space component values.  They pointed out to me that a \"truecolor\r\n      image\" in remote sensing has a more specific meaning: it is a three-band image in which the bands contain data from the red,\r\n      green, and blue portions of the visible spectrum (in that order).\r\n   <\/p>\r\n   <p>That caused me to rethink things a little bit.  If I'm concerned about the distinction between different kinds of <i>representation<\/i>, then I can talk about a color image as being <i>multichannel<\/i> or <i>indexed<\/i>.  That leaves us able to use <i>truecolor<\/i> to refer a specific kind of multichannel color image.  And that has the advantage of leaving our existing doc mostly alone.\r\n   <\/p>\r\n   <p>What do you think?<\/p>\r\n   <p>It interests me that my posts about terminology questions always seem to draw a lot of comment.  And I appreciate that each\r\n      time I do it, you teach me good stuff.\r\n   <\/p>\r\n   <p>One of my favorite terminology stories is when <a title=\"http:\/\/www.hpl.hp.com\/about\/bios\/ron_schafer.html (link no longer works)\">Prof. Ron Schafer<\/a> showed his class a <a href=\"http:\/\/en.wikipedia.org\/wiki\/Sniglet\">\"Sniglet.\"<\/a> (Sniglets, which are made-up words with plausible-sounding definitions, were popular in the 1980s.)  Since we were a digital\r\n      signal processing class, we especially appreciated the definition of the Sniglet <i>point blimfark<\/i> - the point at which the stagecoach wheels in the movie start to look like they're going backward (otherwise known as <i>aliasing<\/i>).\r\n   <\/p><script language=\"JavaScript\">\r\n<!--\r\n\r\n    function grabCode_df3a9d1c526e44c4b391e8b53a8917c2() {\r\n        \/\/ Remember the title so we can use it in the new page\r\n        title = document.title;\r\n\r\n        \/\/ Break up these strings so that their presence\r\n        \/\/ in the Javascript doesn't mess up the search for\r\n        \/\/ the MATLAB code.\r\n        t1='df3a9d1c526e44c4b391e8b53a8917c2 ' + '##### ' + 'SOURCE BEGIN' + ' #####';\r\n        t2='##### ' + 'SOURCE END' + ' #####' + ' df3a9d1c526e44c4b391e8b53a8917c2';\r\n    \r\n        b=document.getElementsByTagName('body')[0];\r\n        i1=b.innerHTML.indexOf(t1)+t1.length;\r\n        i2=b.innerHTML.indexOf(t2);\r\n \r\n        code_string = b.innerHTML.substring(i1, i2);\r\n        code_string = code_string.replace(\/REPLACE_WITH_DASH_DASH\/g,'--');\r\n\r\n        \/\/ Use \/x3C\/g instead of the less-than character to avoid errors \r\n        \/\/ in the XML parser.\r\n        \/\/ Use '\\x26#60;' instead of '<' so that the XML parser\r\n        \/\/ doesn't go ahead and substitute the less-than character. \r\n        code_string = code_string.replace(\/\\x3C\/g, '\\x26#60;');\r\n\r\n        author = '';\r\n        copyright = 'Copyright 2009 The MathWorks, Inc.';\r\n\r\n        w = window.open();\r\n        d = w.document;\r\n        d.write('<pre>\\n');\r\n        d.write(code_string);\r\n\r\n        \/\/ Add author and copyright lines at the bottom if specified.\r\n        if ((author.length > 0) || (copyright.length > 0)) {\r\n            d.writeln('');\r\n            d.writeln('%%');\r\n            if (author.length > 0) {\r\n                d.writeln('% _' + author + '_');\r\n            }\r\n            if (copyright.length > 0) {\r\n                d.writeln('% _' + copyright + '_');\r\n            }\r\n        }\r\n\r\n        d.write('<\/pre>\\n');\r\n      \r\n      d.title = title + ' (MATLAB code)';\r\n      d.close();\r\n      }   \r\n      \r\n-->\r\n<\/script><p style=\"text-align: right; font-size: xx-small; font-weight:lighter;   font-style: italic; color: gray\"><br><a href=\"javascript:grabCode_df3a9d1c526e44c4b391e8b53a8917c2()\"><span style=\"font-size: x-small;        font-style: italic;\">Get \r\n            the MATLAB code \r\n            <noscript>(requires JavaScript)<\/noscript><\/span><\/a><br><br>\r\n      Published with MATLAB&reg; 7.9<br><\/p>\r\n<\/div>\r\n<!--\r\ndf3a9d1c526e44c4b391e8b53a8917c2 ##### SOURCE BEGIN #####\r\n%%\r\n% <https:\/\/blogs.mathworks.com\/steve\/2009\/11\/11\/im-looking-for-a-replacement-for-truecolor\/ \r\n% Yesterday I posted> that I was looking for a replacement for the term\r\n% _truecolor_.  (I won't repeat the explanation here; take a look at the\r\n% <https:\/\/blogs.mathworks.com\/steve\/2009\/11\/11\/im-looking-for-a-replacement-for-truecolor\/ \r\n% original post>.)  Quite a few readers posted interesting and thoughtful ideas. \r\n%\r\n% <https:\/\/blogs.mathworks.com\/steve\/2009\/11\/11\/im-looking-for-a-replacement-for-truecolor\/#comment-22328 \r\n% Gene commented> and <https:\/\/www.mathworks.com\/matlabcentral\/fileexchange\/authors\/35927 \r\n% Rob> sent me e-mail about the use of the\r\n% term truecolor in remotely sensed imagery. I had been thinking about the term\r\n% as defining a form of representation: each pixel is a vector of color-space\r\n% component values.  They pointed out to me that a \"truecolor image\" in remote sensing has\r\n% a more specific meaning: it is a three-band image in which the bands contain\r\n% data from the red, green, and blue portions of the visible spectrum (in that order).\r\n%\r\n% That caused me to rethink things a little bit.  If I'm concerned about the\r\n% distinction between different kinds of _representation_, then I can talk about\r\n% a color image as being _multichannel_ or _indexed_.  That leaves us able to\r\n% use _truecolor_ to refer a specific kind of multichannel color image.  And\r\n% that has the advantage of leaving our existing doc mostly alone.\r\n%\r\n% What do you think?\r\n%\r\n% It interests me that my posts about terminology questions always seem to draw a lot\r\n% of comment.  And I appreciate that each time I do it, you teach me good stuff.\r\n% \r\n% One of my favorite\r\n% terminology stories is when <http:\/\/www.hpl.hp.com\/about\/bios\/ron_schafer.html \r\n% Prof. Ron Schafer> showed his class a <http:\/\/en.wikipedia.org\/wiki\/Sniglet \r\n% \"Sniglet.\"> (Sniglets, which are made-up words with plausible-sounding definitions,\r\n% were popular in the 1980s.)  Since we were a digital signal processing class,\r\n% we especially appreciated the definition of the Sniglet _point blimfark_ -\r\n% the point at which the stagecoach wheels in the movie start to look like\r\n% they're going backward (otherwise known as _aliasing_).\r\n##### SOURCE END ##### df3a9d1c526e44c4b391e8b53a8917c2\r\n-->","protected":false},"excerpt":{"rendered":"<p>\r\n   Yesterday I posted that I was looking for a replacement for the term truecolor.  (I won't repeat the explanation here; take a look at the original post.)  Quite a few readers posted interesting... <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/steve\/2009\/11\/12\/maybe-truecolor-is-ok-after-all\/\">read more >><\/a><\/p>","protected":false},"author":42,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts\/300"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/users\/42"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/comments?post=300"}],"version-history":[{"count":0,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts\/300\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/media?parent=300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/categories?post=300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/tags?post=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}