A tint of green on a gray print.

[Chris Wool]

why should you be left out i have been fighting this the last 3 4 months,
for some reason its got worse than ever before all ways had a very slight tint.

you can force colours under special colours but not to happy with that and don’t work on fades.

best fix so far is to create the fade in PS and save as a rgb jpg then import in to corel. its also a lot nicer fade very smooth.

chris

[Peter Normington]

is it not possible just to use k as the fade, instead of rgb or cmyk?. and tell the rip to preserve black? I may be talking out of my hat, don’t no onyx.

just a thought

Peter

[John Childs]

Funny that.

We have a customer’s image file which is all grey tones.

Before we got our own printer we used to buy the prints in, and they had a green tinge to them. It was a new image for our customer, so we didn’t have to match anything existing, and our customer liked it. So I never gave it a second thought.

Then we got our JV3, printed the same file ourselves, and they came out perfectly grey with no hint of green at all. No matter what I tried I couldn’t replicate the bought in prints.

So here we are, four years down the line, and every time that customer buys new vans I’m still having to buy them in. 🙁

[Simon.Johnson]

Chris,

The problem is that the RIP is still trying to apply colour correction to the image even though it is monochrome or k only on a cmyk file. The function of the ICC output profile is to try to correct the colour of the inks (black in this case) with unwanted effects.

In ColoRIP, select the image configuration you want to use to print the job, click edit and then click colour transforms and in the centre of the window that opens you will see the current ICC output profile selected – change this to none. As you OK your way out it will ask you whether you want to delete the ICC profile as you are no longer using it, say NO!!! when you the get to the point when it asks you to save the file just add "no correction" to the end of the profile name to remind you this is the one to print black and white images. This solution will work for any bitmap image created as a K only colour in a CMYK file or an monochrome bitmap image.

I think you can do a similar trick in Onyx by turning off the ouput profiles.

[David Rowland]

yes, output profiles cause this.

Basically its fine tuning of a profile for that particular media. But without a eye-one reader you cant really do it.

So, i suggested you keep experimenting until u get the right out.

I would be considering C0 M0 Y0 K80 to C0 M0 Y0 K10 fades.

[Chris Wool]

wilco simon leader just adjusted one and will try later, how will this affect other colours ?

chris

[Simon.Johnson]

quote Chris Wool:

wilco simon leader just adjusted one and will try later, how will this affect other colours ?

chris

Oh, if you have a combination of monochrome and colour images on a page you’ve got problems. If the colour images are photographic, the effect of turning off the ICC output will mean that most images just print darker than they should but colour should still be reasonable. You could either brighten the images in PS individually or you can select correction curves within ColoRIP, select the CMY channels only and try to brighten them within the RIP this way. This is a fidge though and will not work so well with very dark or contrasty images but worth a try for speed.

[Chris Wool]

just tried that and has the same or similar effect as using special colours and i am not happy with the print quality not enough ink ??.
i have tried also using the colour separation rules but run out of talent,

chris

[James Langton]

Hey Chris, Im glad your still struggling because I sure Im. What I cannot understand is why my cheap desktop is able to get 50% black and a 20k printer cant get it. The only way I can see round this problem is to show the customer a lighter gray. But thats not always what they want.