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Currently I'm using ArcMap>Image Analysis>Greyscale function to greyscale an OS VectorMap tiff. This turns hill or housing colours into greyshades as expected & shown in the image below.

Is there a way to greyscale the image but remove the grey fill on block shading like houses, hillsides or roads?

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Classify symbology as unique values. As long as the features you want to remove are all the same value, you can just change their color.

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