How to edit min/max values in Symbology when grayed out?

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03-26-2021 11:33 AM
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JanelleKmetz
New Contributor

Hello. I am using ArcPro and I have imported thermal infrared raster images (as TIFF files) which have a min and max value representing the stretch of thermal temperature data. I want to change the min and max values of my rasters so to alter the color/range of temperature values. 

I know you can change min / max in the Symbology tab, but for me it is grayed out and I cannot change the values. I think there is a way to get around this issue. Can anyone help? 

JanelleKmetz_2-1616783526935.png

 

 

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5 Replies
DanPatterson
MVP Esteemed Contributor

what about changing the clip min, max?


... sort of retired...
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JanelleKmetz
New Contributor

Hi Dan, thank you for your response. If I change those parameters, the image does change dramatically, but see that the pixel value range is still the same (i.e. 7... - 36.....). I am not fully sure what the clip does, but I do need the pixel values to represent the correct temperature scale that I want to specify.

JanelleKmetz_0-1616784101142.png

 

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DanPatterson
MVP Esteemed Contributor

Sorry I don't have anything to test with, perhaps trying something other than stretch has other options


... sort of retired...
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JanelleKmetz
New Contributor

That's ok! Thank you for your suggestions! Maybe someone else will help me out :)

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MervynLotter
Regular Contributor

One option would be to create a new raster with the required/desired range of min and max values using the Create random raster GP tool.  But use the GP tool listed under Data Management toolset  and not  Spatial Analyst tool as the former lets you specify minimum and maximum values. Then symbolize it and save as lyrx file. Then from your thermal infrared raster images, import the symbology from your new lyrx file you just created.  

It should give you your desired symbology.