Hot answers tagged rgb
3
Your fire hydrants will have a very unique spectral signature, therefore I would use supervised maximum likelihood classification to classify your raster. An alternative is to run an ISODATA algorithm for an unsupervised approach. Try the following (partial) workflow:
Open Iso Cluster Unsupervised Classification in ArcGIS
Enter ALL 3 bands (i.e. R, G, B) ...
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Herein lies a misunderstanding: "...that is done separately for each band and not for a specific colour."
"Each band" and "specific colour" are in fact the same thing. That is, it is the values in each band that, when combined together, make a specific colour. For example the RGB triplet 255,0,0 is the specific colour of pure red, comprised of band-red at ...
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