Your plain ivory texture seems to be a flat RGB #F9F6F1. Yet, the normal 3D pane renders it differently (darker) than a wall coloured with the same #F9F6F1. A quick photo rendering also showed a difference, but less so. Similarly, a wall coloured with white #FFFFFF appears much lighter than a texture with white (#FFFFFF) tiles (like the one below).
This is a bit strange, and I have sometimes wanted my white tiles to be whiter. That said, I agree with hansmex and you need to experiment both with colours and textures. Actual colour, perceived colour and rendered colour will always differ. And especially so with light-sources that (may) have a different hue / colour temperature. It is certainly hard to get it right in real life too.
ok
