Eyedroppper does not sample placed bitmaps correctly
Sampling a colour in a bitmap placed in Illustrator does not sample the correct colour value if the bitmap is placed using the "Link" option.
If the bitmap is placed with the "Link" option switched off ie embedded the the colours are sampled correctly.
I have attached a reference image which shows a placed, linked file in an Illustrator document. The squares at the bottom are colours created in Photoshop with their colour values indicated. The circles at the top are vector objects in illustrator with the colour values as the eyedropper tool sampled them.