Fetch and store color value in a variable

Hi,
Iam basically trying to fetch the color value of the pixel at position 0,0 and store it in the hex format "#cccccc" in a variable . 

FOR /F %%i IN ('identify -format "%%[fx:p{0,0}]" "img.jpg"') DO SET x=%%i (here iam getting some decimal value like x=0.298110)

I tried to change it into Hex value by using this..

For /F %%s IN ('EVAL "rgb(%x%)"') Do SET hexColor=%%s

This is not working ..Please Help

Regards,
Mini