stroke border choosing colour from picture



I like to add a border to my picture which matches the content. The border would reflect the colour of the dress or whatever eye catcher in the picture.

From the stroke border the colour cannot be picked up directly. One has to go back to the develop module. Moving the mouse above the picture displays the RGB colour below the histogram, and note it down to be copied back in the print module. It is tedious, and results are not up to expectation.

The solution would be to be able to pick-up a colour from the picture directly, even better to be able to select a surface rather than an single pixel (giving an average colour).