Blue print comes out pink. Something weird about the files.

[RobertLambie]

Reminds me of one of our old printers…
We naively bought our old Roland PC60 to do a specific job, van graphics. print and cut for a local authority. It was the first one sold in the UK. so I am “guessing” it must have been around 1995.

The job was for 36 vans, Logo and text, all print and cut, transitioning from Dark blue at the top to light pastel blue at the bottom of the letters. This first job more than paid for the machine so it was a great addition to our kit, but the learning curve was a nightmare hiding around the corner.

In short, the transition from one colour to the next was almost a blend of Magenta!
This opened a can of worms for us, trial and error galore! Even calling tech support for advice wasn’t getting anywhere. keep in mind it’s a brand-new machine for Roland UK.
anyway, It was so long ago… but from memory, there was a combination of things and we had to settle for the best output we could get.

• Machines Colour Gamut:
  At a later stage, I think we were advised the colour range may be a factor.
  
• The software was used to make the vector-fill colour blend transition.
  We tried Signlab, Photoshop, Illustrator and Corel.
  
• CMYK / RGB:
  RGB worked best I think.
  
• When the file was in vector format, rotating the graphic upside down, or horizontally, also altered the transition output.
  
• Converting the file types. The best we settled on was .JPG

From memory, we rotated the vector and used the blend that had the least amount of magenta when printed, and then flattened the image to a .jpg in RGB format. This gave us the best of a bad shortlist of output options.
Keep in mind this is around 1995 and we had only ever had a Roland WAX ribbon printer before the PC60 and before that was a Fargo A3 vinyl printer. So this Roland PC60 was cutting-edge machinery, to us! 🤓😂

Anyway, I doubt the issue will be your HP latex colour gamut, so maybe the vector blends transition settings or colour values, or both. which you may have changed when you converted to .jpg.
I am guessing of course, but the main thing is that you resolved it fast enough on your own.

From time to time, I see a similar issue when printing some light shades of grey, where the magenta appears slightly through the colour. But this normally boils down to the colour values and can easily be tweaked.

[Simon Worrall]

Ha!
I bought one of those horrid old pc60s second hand. Might have been your old one! Late 1990s.

It couldnt seem to finish a print without messing something up. Tangled ribbon, usually.

Probably the worst idea Roland has ever had.

[David Hammond]

Certainly strange. Do you know what software they were originally designed in? Some produce questionable pdfs.

Perhaps there’s an overprint or transparency setting in the artwork buggering it up.

If you have acrobat pro, you can preflight the PDF and convert it an X1a standard, which comes in handy at times.