Ronster, to harken back to your first post, I see an issue with some of your image choices. althor1138 has done a magnificent job archiving the LD versions and what is often called the Technidisc is a reissue of the 1989 Special Widescreen Edition (middle of the third row). I believe this is the original release with the creeping letterboxing, but I think the colors remained the same. the Technicdisc reissue was just a superior transfer of the telecine. But you posted an image in your original post that does not match any of the versions I have. It certianly does not match the SWE as captured by althor1138 (shown in these images un-altered from his capture).

And the blu-ray has noting on the French Pyramid Boxset when it comes to magenta and purple.