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.
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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.