I hope you guys can help me. I recently made an ad in adobe illustrator
which has a greyscale image with an orange to transparent gradient on
top made by creating an opacity mask. Well on the screen it looks fine
and so I sent it to the comercial printer. However when the comercial
printer gave us the proof it shows a sort of lighter hue band in the
area where the orange gradient ends and meets with the grey image
below. In other words, instead of the gradient blending smoothly with
the grey image below (as it shows ...