I came across a great online tool for house painters and renovators today. The interesting thing is that I was looking at a computer image editing software when I found the tool.
https://photodemon.org/ is a lightweight image editing tool that can be used directly from a USB stick. It is Open Source, and completely free. I was looking at the list of contributors to the software – other software modules that make it work.
Among the list was a software I had not heard of: https://www.easyrgb.com/en/.
EasyRGB provides a unique search engine to professionally handle color data and commercial colors references”
EasyRGB.com
Basically there are a set of tools to help you with paint colours and cross referencing them to different Brand Names.