How to make drop shadows without banding for offset printing?

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i like make drop shadows under our products on our brochures. while great on screen, suffer banding on printed pieces via offset printing. here's how make them in cs6:

 

  1. create layer under main image.
  2. on layer use rectangle marquee tool create box in location of desired shadow.
  3. hit shift + f5 , fill black.
  4. deselect black filled box.
  5. go filter > blur > gaussian blur , select radius of 40-80 depending on size of image.
  6. go filter > blur > motion blur , select distance of 125 -250 depending on size of image. select appropriate angle match image.

 

i've talked printer , said fine said make sure i'm filling box k , not rgb (which am) , adjust opacity it's below 25%. problem when set opacity of shadow layer 25%, shadows barely visible. not want. want nice dark shadow under main portion of product , fading out nothing. way looks great on screen how great on paper?

blindly advising set shadows 25%? i'm not sure whether makes me laugh or weep. it's missing point completely. long shadows visible in cmyk channels , don't exceed maximum ink density, print properly. it's not black printed on top of other colors in offset printing, know. gets halftoned other inks. similarly, banding problems come down understanding part - banding occurs if color dense , results in large/ dense halftone dots produced shouldn't or on other hand printer oversaturating colors , exceeding maximum color dot can take, there's lot of dot gain due ink seeping out. there may of course limitations e.g. shadows achieving correct densities when reducing opacity, 25% telling van gogh should have painted sunflowers pink...

 

mylenium



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