Am i mossing something or is this really a blog post saying that if you put something red in a picture and compare it to the same thing without red, then the picture with more red, looks, well, more red?

If you put an object of color X of intensityn N in a net with color X of intensity N+M, then the object will get some spill over from the net similar to M, which the brain/person doesn't necessarily realise and simply assigns it to the object ad well.

It is also a consumer advice about not comparing an orange inside a bag (of any color) with one outside of one as we have a hard time truly comparing them.

It's like science fair energy for adults: "Ok but how much more red, exactly?"