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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Richard,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I partially figured it out, but I still could use some help.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The problem that I had was not with the created image itself, but how ESRI displayed it. By default ArcMap uses no stretch to display the SID image while it
uses a percent clip stretch for the created tif . After I changed the stretch from percent clip to none the images appeared almost the same, but there was still some differences. Next, I changed the stretch to minimum-maximum on the created tif image and
I could not tell any difference between the sid file and the tif image.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Questions:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">When creating a tiff file in gdal_translate, can I adjust settings so that the new image will appear exactly like the old image without having to
turn stretch to minimum-maximum?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Is there a way in mapserver to change the stretch from none to minimum maximum (or other types of stretches if desired) and if so is there a performance
hit?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Is there a way to modify a tiff file so that any GIS program including ArcGIS that opens up the file will use the correct stretch type, or is there
a setting within ArcGIS that will always use a certain type of stretch when it opens up tiff images?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Mark Volz, GISP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">GIS Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Richard Greenwood [mailto:richard.greenwood@gmail.com]
<br>
<b>Sent:</b> Wednesday, July 10, 2013 6:32 PM<br>
<b>To:</b> Mark Volz<br>
<b>Cc:</b> fwtools@lists.maptools.org<br>
<b>Subject:</b> Re: [FWTools] gdal translate - air photo seems washed out after converting image<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jul 10, 2013 at 3:08 PM, Mark Volz <<a href="mailto:MarkVolz@co.lyon.mn.us" target="_blank">MarkVolz@co.lyon.mn.us</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal">Hello,<br>
<br>
I converted a mr sid air photo to a tif file. The colors appear washed out and too bright compared to the mr sid file.<br>
<br>
<br>
I would like to create an image file that has the following three characteristics:<br>
<br>
1) Fast for Mapserver to read.<br>
2) Relatively the same size as the MrSID file. - I would prefer a file size that is no larger than twice the size of the Mr SID file, even if it means that I have to take a small hit by using compression<br>
3) retains the same image quality as the original MrSID file<br>
<br>
The following two commands made the image fast for mapserver, and relatively small. But the colors were washed out...<br>
<br>
c:\ms4w\apps\PipestoneMaps\Raster\Picto2013>gdal_translate -CO TILED=YES -CO PHOTOMETRIC=YCBCR -CO TFW=YES -CO COMPRESS=JPEG -CO BIGTIFF=YES MNPIPE13-SID-9INCH.sid New.tif<br>
c:\ms4w\apps\PipestoneMaps\Raster\Picto2013>gdaladdo -r average --config compress_overview JPEG --config photometric_overview YCBCR New.tif 2 4 8 16 32 64 128 256<br>
<br>
<br>
What can I do to improve the image quality, while retaining the speed and a moderate file size?<br>
<br>
Thanks<br>
<br>
Mark Volz, GISP<br>
GIS Specialist<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Mark,<o:p></o:p></p>
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<p class="MsoNormal">Those are pretty much the commands that I regularly use to prepare imagery for mapserver. I have never experienced any noticeable color distortion. What does it look like with a straight
<br>
gdal_translate MNPIPE13-SID-9INCH.sid New.tif<o:p></o:p></p>
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<p class="MsoNormal">obviously that's not what you want for a final product, but it would be my first step toward 'debugging' the problem.<br>
<br>
Rich<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><br>
-- <br>
Richard Greenwood<br>
<a href="mailto:richard.greenwood@gmail.com">richard.greenwood@gmail.com</a><br>
<a href="http://www.greenwoodmap.com">www.greenwoodmap.com</a> <o:p></o:p></p>
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