View Single Post
Old 05-26-23 | 09:00 AM
  #16  
Aardwolf's Avatar
Aardwolf
Wheelman
 
Joined: Aug 2021
Posts: 1,623
Likes: 1,575
From: Putney, London UK

Bikes: 1982 Holdsworth Avanti (531), 1961 Holdsworth Cyclone, 1953 Holdsworth Whirlwind

Yay, mine for £127.
Now cleaned up, braze-ons fixed, and undercoated in RAL9016



So I really need to work out how to do Pearl Red.

So far I've found white undercoat / red base / clear with pearl is the way to go (for me anyway).
But I think I'm having issues because the red base is slightly the wrong colour and I've been trying to correct that in the clear with pearl.

So I measured the colour difference in some photos and bought another red that should give the correct colour when mixed 50/50 with my original red.
Of course there's a lot that could go wrong:
  • photos aren't colour balanced properly
  • paint is only available in named colours (RAL Classic, BS, NCS, NCS 2050 in this case)
  • paint maufacturer isn't that close to the named colour
So I figure from 50/50 I can maybe change the mix slightly to get closer.

Looks like I may be getting somewhere:



Paint 1: BS 381C 564 Bold Red
Paint 2: NCS S 3060-R10B
(background is a Kodak grey card)

The 70/30 mix has a measured delta E 2000 of 0.76 - "no difference to the human eye"
So it's now time to play with my pearls


Some links:
delta E: https://www.colorwiki.com/wiki/Delta...lor_Difference
Average colour of an image: https://azer.io/average-color/
RGB to Lab: Welcome to Bruce Lindbloom's Web Site
Lab to delta E 2000: Welcome to Bruce Lindbloom's Web Site
Aardwolf is offline  
Reply