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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Chas,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">If I have a color GEOTIFF and I want to show or save it as a grayscale GEOTIFF, I use one of these 2 solutions. Depending on the control you want on the color to grayscale conversion
it might also be a solution for you.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Solution 1:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">If the only thing you want to do is show a colour geotiff in grayscale, you can just change the properties of the layer. In the layer properties you go to the tab “Style”. Under “Color
rendering” you will find the option “Grayscale”. By default the option will be set to “Off”, but you can change it to turn grayscale on. Try one of the three options to see what fits your image best. After that you can also change the values of “Brightness”
or “Contrast” to get the best result.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">This way you won’t change anything in your source file and it won’t save a grayscale tiff, but it will just show your raster file as grayscale in QGIS.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Solution 2:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">If you want to end up with a geotiff file that has the same information in grayscale I usually use some graphical software in the process, but for that you can’t use a GeoTiff, because
you would loose the georeference information of the file. Therefore I use the following steps:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Save your geotiff file as TIFF-file with a TFW file:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Right click on your source geotiff file in the layers panel.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Select Save As…<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Select Rendered image as Output Mode<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">d.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Select Gtiff as format
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">e.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Deselect “Add saved file to map”<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">f.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Under “Create Options” click on the + button to add an option. For the newly added option you have to type TFW as “Name” and YES as “Value” (double click in the newly created
Option cell to type in it).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">g.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Click on the “Browse…” button to select a name and location for your grayscale TIFF file.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">h.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Click on the “OK” button<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Open the newly created TIFF file in graphical software like XnView, IrfanView or GIMP. Change the image in that software to grayscale and save the file.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Add the newly created TIFF file back to QGIS<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Save your newly created TIFF file as a GeoTIFF file:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Right click on your newly created TIFF file in the layers panel.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Select Save As…<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Select Rendered image as Output Mode<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">d.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Select Gtiff as format
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">e.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Click on the “Browse…” button to select a name and location for your grayscale GEOTIFF file.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo4">
<![if !supportLists]><span style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">f.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D;mso-fareast-language:EN-US">Click on the “OK” button<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Michel<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="NL" style="color:windowtext">Van:</span></b><span lang="NL" style="color:windowtext"> Qgis-user [mailto:qgis-user-bounces@lists.osgeo.org]
<b>Namens </b>Chas Sheen<br>
<b>Verzonden:</b> woensdag 17 januari 2018 14:33<br>
<b>Aan:</b> 'Micha Silver' <tsvibar@gmail.com>; qgis-user@lists.osgeo.org<br>
<b>Onderwerp:</b> Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">Mike,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">So everything in the capture below of the Raster calculator should work? I cannot find any output.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">I’m in Perth, Australia so home now and away from the office and QGIS, but would like to get it working tomorrow.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">How do apply a grayscale to a raster? As I said, I’m new to QGIS<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext">Chas Sheen<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext">From:</span></b><span lang="EN-US" style="color:windowtext"> Micha Silver [mailto:tsvibar@gmail.com]
<br>
<b>Sent:</b> Wednesday, January 17, 2018 8:39 PM<br>
<b>To:</b> Chas Sheen <chassheengeo@gmail.com>; qgis-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-AU">Hello Chas<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-AU">On 01/17/2018 01:52 PM, Chas Sheen wrote:<o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">Richard,</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US"> </span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">I should have made my initial query clearer.</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">I am trying to output a black and white geotiff.</span><span lang="EN-AU"><o:p></o:p></span></p>
</blockquote>
<p class="MsoNormal"><span lang="EN-AU">It's still not clear what you are asking. AFAIK, there's no such thing as a "black and white geotiff". You can apply any color table you want to any raster. You can apply a gray scale to any of the landsat bands.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">If you are trying to create a new raster from the three RGB bands using some expression, that should work. You can use either of three tools: the built in QGIS raster calculator, or thru the Processing toolbox there's
SAGA Raster calculus and the GRASS module r.mapcalculator. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Again, none of this has anything to do with coloring. After running the raster calculator, you can color the result with a gray scale color table, a red color table, or any other color ramp you choose.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">Have split the original (landsat) image into RGB images.</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">When I apply the expression in the capture below, and hit run, nothing is saved to the results directory.</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">I’m assuming that my expression or something else in the raster calculator is wrong?</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US">The final product that I’m after is a xyz grid where z is the black-white amplitude…which I think should be relatively easy (?) once I have the black-white image.</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU">After you running the calculator expression, then you can save the result in many formats, including gridded XYZ, ArcINFO ASCII, or many others, using the gdal_translate tool. This is under the Raster->Conversion menu.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US"> </span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext">Chas Sheen</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext">0448017282</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="color:windowtext;mso-fareast-language:EN-US"> </span><span lang="EN-AU"><o:p></o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext">From:</span></b><span lang="EN-US" style="color:windowtext"> Richard McDonnell [<a href="mailto:richard.mcdonnell@opw.ie">mailto:richard.mcdonnell@opw.ie</a>]
<br>
<b>Sent:</b> Wednesday, January 17, 2018 7:13 PM<br>
<b>To:</b> Chas Sheen <a href="mailto:chassheengeo@gmail.com"><chassheengeo@gmail.com></a>;
<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator?</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Chas,<br>
Two options for splitting RGB into separate images in QGIS.<o:p></o:p></span></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang="EN-AU">Semi-Automatic Classification Plugin, Preprocessing, Split Raster Bands<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang="EN-AU">Grass r-rgb (Processing Toolbox)<o:p></o:p></span></li></ol>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-AU">Any one of these tools will split the Raster for you easy enough<br>
Regards,<br>
<br>
Richard<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU">On 17/01/2018 00:48, Chas Sheen wrote:<o:p></o:p></span></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt">I split the image into R, G, B</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt">Worked out in QGIS wher the Raster map calculator is.</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt">Run...several times</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt">No result foud in Results Directory. It runs quickly then refreshes inputs and logs to blanks.</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt">I'm new to QGIS....so have probably left out something basic.</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt">Any clues</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt"> </span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU" style="font-size:9.5pt"><img border="0" width="616" height="720" id="_x0000_i1025" src="cid:image001.png@01D38FA1.54D22080" alt="Displaying image.png"></span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-AU"><br>
<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-AU">-- <br>
<b><u>Richard McDonnell</u></b><br>
</span><b><span lang="EN-AU" style="font-size:7.5pt">GIS Specialist PgD GIS AssocSCSI</span></b><span lang="EN-AU"><br>
</span><b><span lang="EN-AU" style="font-size:7.5pt">OPW FRM Data Management</span></b><span lang="EN-AU"><br>
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<p class="MsoNormal"><span lang="EN-AU"><a href="http://www.opw.ie/"><span style="border:solid windowtext 1.0pt;padding:0cm;text-decoration:none"><img border="0" width="405" height="225" id="_x0000_i1026" src="cid:image003.jpg@01D38FA1.54D22080" alt="Afbeelding verwijderd door afzender."></span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-AU"><br>
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<o:p></o:p></span></p>
<pre><span lang="EN-AU">_______________________________________________<o:p></o:p></span></pre>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-AU"><o:p> </o:p></span></p>
<pre><span lang="EN-AU">-- <o:p></o:p></span></pre>
<pre><span lang="EN-AU">Micha Silver<o:p></o:p></span></pre>
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