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Where do I find RGB values in ArcGIS?
The ability to set the fill colour for a symbol from RGB values stored in the attribute table of a shapefile/feature class. So if you are wanting to do this for points, polylines or outlines of polygons then you may want to submit additional or more comprehensive ArcGIS Ideas.
How to create a layer symbology file in ArcGIS?
Both matched and unmatched values will use a color from the color ramp and the symbol defined by . The legend is updated to contain all matched and unmatched values.
How to set color of symbol from RGB values?
However, there is an existing ArcGIS Idea to Set symbol color from RGB values in attribute table so I recommend that you add your vote to that. Note that the above ArcGIS Idea only covers: The ability to set the fill colour for a symbol from RGB values stored in the attribute table of a shapefile/feature class.
How to select and extract data in ArcGIS?
The Make Feature Layer (and the related Make Query Table) geoprocessing tool creates a layer that lets you do calculations and selections. You can build SQL queries into the feature layer to select particular features or rows from the source data. These tools can be found in the Layers and Table Views toolset of the Data Management toolbox.
Is there a way to symbolize layers in ArcGIS?
As mentioned in comments, I am not aware of any out-of-the-box way for ArcMap to symbolize layers using RGB values stored in an attribute table, or using RGB values in Excel joined onto an attribute table. However, there is an existing ArcGIS Idea to Set symbol color from RGB values in attribute table so I recommend that you add your vote to that.
When do you use graduated symbols in ArcGIS?
For example, you might use darker shades of blue to represent higher rainfall amounts. When you draw features with graduated colors, the quantitative values are grouped into classes and each class is identified by a particular color. Another alternative to represent map quantity is to use graduated symbols.
Where are color values stored in ArcGIS Pro?
For layers that are symbolized by graduated symbols, color values are stored in the style file for all values including those values that are out of range. In the case of polygon features symbolized by graduated symbol symbology, color is stored for the Template point symbol only.