why does rockhopper keep printing green tint on all imagery?

[Lorraine Burke]

Have you tried printing it in different colour modes? Have a look at the original file to see if its CYMK or RGB, sometimes this can be the case.

It happened to me before where i was printing an image for a deli and some images looked as they should and there was just one image printed on the same material etc as the others but had a green tinge to it (been food not very appetising!).
After much hair pulling i went back to the file in photoshop and discovered i had it in RGB mode instead of CYMK.
I then changed it in Photoshop via <Image> and all was good.
Hope this is of some help.. if only for the process of elimination.

[Adam Hilson]

Hi Lorraine,

Thanks for the reply, I’ll give that a go. Does the image have to be saved as a PSD for the CMYK to register? Or will JPEG do?

I think I have got around the current image by changing the media type in Onyx, it looks a lot less green but there’s still a sepia look to the printed image.

[Lorraine Burke]

Hi Adam, a Jpeg should be fine once its in CYMK mode.

The way i would check is i would open the jpeg in photoshop go to the menu bar and you will see the "image" menu, from that image menu you will see "mode" just click on that and you will see a tick beside whatever mode the file is in.
If its in RGB just tick it to CYMK and save.

Also in the RIP check that in your print settings its on CYMK mode.

Best of luck with it 🙂

[Adam Hilson]

Hi Lorraine,

I thought the change in media type had fixed the tint, but I dont think it has.
I tried an image converting to CMYK in Photoshop, but its still doing it.

The tint problem is annoying itself, but the way it keeps happening after fixing it is the main grief I’m getting.

Thanks,
Adam H

[Adam Hilson]

Just an update:

I’ve just carried out a test print. I made 4 bars in Photoshop, each bar being either K, C, Y or M. The bar would be a gradual fade from 100% to 0% of each colour.
It all started out fine, but as the colours started to get closer to 0%, there was a noticable amount of green tint appearing (the most noticable colour was K).

I carried out a similar test earlier with a JPEG file (saved as CMYK in Photoshop) and the C line had a tint of green to it … the latest test was saved as an EPS file and the C line was almost completely C 🙂

Edit
The green tint starts to appear when each colour gets around 50%, any lower than this and the green becomes more and more visible.
On the K line, it’s very bizzare because why is the printer printing a green tint when the line should be Black to White (therefore grey in the middle) … but in this instance, its Black – Dark Grey – Light Green – Small amount of White

[Chris Wool]

quote :

On the K line, it’s very bizzare because why is the printer printing a green tint when the line should be Black to White (therefore grey in the middle) … but in this instance, its Black – Dark Grey – Light Green – Small amount of White

on some rips the K is not used until the shade of black is above 50%, the Gray is made up of all colours if out of balance it has a tint.

in PS as you put the cursor over a grey area of the image then the RGB values should be equal.
dont understand why it should come and go. apart from you having a profile switched on sometimes as you save.

chris

[Lorraine Burke]

quote Adam H:

Just an update:

Edit
The green tint starts to appear when each colour gets around 50%, any lower than this and the green becomes more and more visible.
On the K line, it’s very bizzare because why is the printer printing a green tint when the line should be Black to White (therefore grey in the middle) … but in this instance, its Black – Dark Grey – Light Green – Small amount of White

Hi Adam, is it only with printing tints / gradients you are having the problem?
Can i see the file or if its too big just a slice of it?

[Adam Hilson]

Chris Wool:

I tried a profile which has worked no problem before, and this did make the tint less obvious, but the tint is still there.
As the tint is green, am I right in thinking its the C and Y colours that are out of balance ?

The colours look perfect in PS, its only on the print itself when the tint appears.

Interesting point though, I would of thought the printer would use K for the entire K line?

Lorraine Burke:

The tint appears on all prints. An image I tried last night was most noticealbe as the image was supposed to be Black & White, but where the Black became lighter and where White should of been present, there was a definate colour tint.

I shall try to get some pictures up to show whats happening.