Flattening issue... I think

[DoubleDiamond]

We have been having an issue for about a year with this one customers art. We are doing the fifth wrap for them and I keep promising we will get the yellow background to be a very bright yellow. We've have tried many time consuming tests and we have had to settle on one that comes close... but not really the bright yellow I know we can do. When we make a box alone and color it we print a great looking yellow, but we add a mostly blue logo and text we get a greenish yellow as a background. We tried to remove the background and flatten everything with a transparent background, then bring in the yellow background it still alters the background. We are trying this in ai and ps both cs3 and the latest cc version. We have overcome this flattening issue before mostly by just saving as a jpg, but not this time. It keeps looking like it's flattening and altering the whole background or just the areas around the art. What we are looking for is any recommendation of how to save the photoshop layered created file to print unchanged on the roland sp-540v. Thank you very much DD

 

[OADesign]

I think you may have a rgb vs cmyk issue. I think if you change your doc to the cmyk color space and the change the yellow color value to c0m0y100k0, you will get a nice "yellow". You may have to tweak the blue color value to get where you need to be but give that a shot. Also consider trying to build the image in AI using the Roland Color Library. (which you can import into AI) The values RVW-PR01k through RVW-PR01E are bright Yellows. I know there are many threads here about what color space to send to rip, but in my experience there are some colors (Yellow and Red included) that only come out to my satisfaction when sent in the cmyk color space.