<div dir="ltr">JAI-ImageIO TIFFDecompressor does the same (Line 0888):<br><div><a href="https://java.net/projects/jai-imageio-core/sources/svn/content/trunk/src/share/classes/com/sun/media/imageio/plugins/tiff/TIFFDecompressor.java?rev=254">https://java.net/projects/jai-imageio-core/sources/svn/content/trunk/src/share/classes/com/sun/media/imageio/plugins/tiff/TIFFDecompressor.java?rev=254</a><br><br></div><div>(also putting an imageio-ext link for quicker reference)<br></div><div><a href="https://github.com/geosolutions-it/imageio-ext/blob/master/plugin/tiff/src/main/java/it/geosolutions/imageio/plugins/tiff/TIFFDecompressor.java#L900">https://github.com/geosolutions-it/imageio-ext/blob/master/plugin/tiff/src/main/java/it/geosolutions/imageio/plugins/tiff/TIFFDecompressor.java#L900</a><br></div><div><br>Note the: <br>redLut[i] <span class="gmail-pl-k">=</span> (<span class="gmail-pl-k">byte</span>)((colorMap[i]<span class="gmail-pl-k">*</span><span class="gmail-pl-c1">255</span>)<span class="gmail-pl-k">/</span><span class="gmail-pl-c1">65535</span>);<br></div><div>which results into using a 257 scale factor.<br></div><div><br></div><div>Cheers,<br></div><div>Daniele<br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Nov 25, 2016 at 11:27 AM, Ari Jolma <span dir="ltr"><<a href="mailto:ari.jolma@gmail.com" target="_blank">ari.jolma@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span class="">
24.11.2016, 18:01, Even Rouault kirjoitti:<br>
<blockquote type="cite">
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Could be worth fixing that if that cause issues (apparently in your use case at least), but I'd be interested by information of what is the standard/recommanded/best-<wbr>practice-in-the-industry/etc..<wbr>. formulas to use for the mapping between the [0,255] and [0,65535] ranges.</p>
</blockquote>
<br></span>
At least in the GTK circles it seems to be a standard practice to
use the 257 as the scaling factor. See for example<br>
<br>
<a class="m_-1105274854933738756moz-txt-link-freetext" href="http://gtk2-perl.sourceforge.net/doc/pod/Gtk2/Gdk/Color.html" target="_blank">http://gtk2-perl.sourceforge.<wbr>net/doc/pod/Gtk2/Gdk/Color.<wbr>html</a><span class="HOEnZb"><font color="#888888"><br>
<br>
Ari<br>
<br>
<br>
<br>
</font></span></div>
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