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I have the same problem. My current plan is to illuminate a patch from many angles to eliminate all the shadows. Add a reference white or gray card. Take a phot
by lttlrck 7y ago
I have the same problem. My current plan is to illuminate a patch from many angles to eliminate all the shadows. Add a reference white or gray card. Take a photo then in GIMP, adjust the white point, blur the stucco, read off
the RGB and look up the closest matching color code. I have yet to find a way to look up by RGB.
If it somehow works I’ll avoid having to paint the whole house.
- joshyeager 7y agoYour best bet is to cut a piece of paint off the wall and take it to a paint store. They probably won’t be able to match it exactly, but it’ll be closer than you can do in RGB.
- catblast 7y agoIf you’re concerned about a close match, this is unlikely to give satisfactory results. Take your samples to a good paint store. Those machines are more sophisticated then you may think.
- mceachen 7y agoThe colorimeter at your local paint store, looking at a paint chip from your wall, is very likely going to do a whole lot better than the process you just described. If you call the store, ask how big of a paint chip sample they need to match existing, weathered paint. It very well may be tiny (like, 1cm^2), and they should do this color match for free. You could buy just a pint, first, to see that it works. I've been quite surprised by how non-uniform most digital camera imagers and in-body post processing color pipelines muck with the spectrum coming off the sensor, all in the name of producing a more pleasing JPEG. If you still want to do what you described, I'd use RAW and use dcraw to convert to tiff, and open that in gimp.
- qubex 7y agoWhat they have in-store is most likely a spectrophotometer, not a colorimeter.