Explanation

This is the top 3rd of an orchid done in colored pencil.  I unfortunately do not have a scanner with a big enough bed to do the whole piece at once, and I am having great difficulty putting the 3 scans together in Photoshop.  The reason for this is that the paper sits at different heights from the bed when I put it in different places, and this affects the color of the background.  It is hard to match up the whites, as some are in shadow.  Does anyone know where I can find a scanner with a big bed to use for this piece???