Charge Black to K100 in photos

[krankn]

Can you change blacks in photos to 100% black? eg k100

as you can do in photoshop
eg edit>covert to profile>custom CMYK> black generation maxium

 

[mattbeals]

No, but you can use a device link profile with maximum GCR.

 

[krankn]

Can you tell me how you do that. I new to this program.

 

[michaelejahn]

Blacks in Photos rarely are 100 black for a reason...

Blacks in Photos rarely are 100 black for a reason...

Can you tell me how you do that. I new to this program.

New to WHAT program ... ?

What are you asking to change ? Just the images inside a PDF ?

What RIP are you using ?

Are you using some workflow product ?

 

[krankn]

The program is pitstop pro. I am trying it out to see what it does.

What I want is to remove ink density. eg photoshop black in pdf files. eg C90 M90 Y90 K100

We get a lot of files from clients and this is a big problem. We fix photos in photoshop at the moment. and change the vetor problems in illustrator. What I was looking for is a program that can fix problems in PDF file. Pitstop shows the problem but it can not fix as far as I know.


I love the other fixes.

 

[mattbeals]

What you're asking for is training which we really can't do well on a forum like this. But if you have a device link profile with the correct options there is a color conversion menu that can do this. In a pinch you can convert the image back to RGB and then again to CMYK.

 

[krankn]

CMYK to RGB then back to CMYK does not fix oversaturation of black ink in images. In pitstop pro or photoshop.

Looks it this program can not do it. Will have to do it the harder way in photoshop (convert to profile and change ink that way) - unless someone has a answer.

 

[michaelejahn]

What CMYK values would you like to achieve when output ?

What CMYK values would you like to achieve when output ?

CMYK to RGB then back to CMYK does not fix oversaturation of black ink in images. In pitstop pro or photoshop.

Looks it this program can not do it. Will have to do it the harder way in photoshop (convert to profile and change ink that way) - unless someone has a answer.

There are several way to 're-separate' an image - you really can't move an image very far with device link profiles, and most applications that provide "Ink Optimization" are designed to move density from the CMY to the K channel, which - in you example - C90 M90 Y90 K100 - K is already at 100%

So, please send me an example to [email protected] - and tell me what you would like the re-separated file to be when I am finished...

So I know what you are after - just tell me the CMYK tint values you desire - Compose is a reseller of Compose PhotoSumo and ALWAN, I will try them both.

 

[mattbeals]

CMYK to RGB then back to CMYK does not fix oversaturation of black ink in images. In pitstop pro or photoshop.

Looks it this program can not do it. Will have to do it the harder way in photoshop (convert to profile and change ink that way) - unless someone has a answer.

Actually, it does to a certain degree. The results depend on the CMYK profile that you are converting to and how the separation are setup. If the profile has high GCR then when you convert to RGB and then back to CMYK it will use the output profile separation to add more black than CMY. Part of that also includes the total ink limit.

So in PhotoShop you will have a CMYK image from the PDF. You'll probably convert to RGB and then to some CMYK profile. This is what I was describing in PitStop. Convert the image to RGB with the color conversion panel and then convert it back to CMYK. If you have a custom CMYK setting that you have created in PhotoShop then you can save that out and store it with all the other ICC profiles. Restart Acrobat, select images, convert to RGB and then convert back to CMYK using your custom CMYK profile.

Sounds pretty much the same procedure as what you are talking about in PhotoShop. Unless of course there are PhotoShop specific things that you are doing. But basically it's the same thing.

 

[krankn]

In photoshop i use custom profile GCR to maxium for black.

eg edit>convert to profile>profile: charged to- custom CMYK> then i change GCR to maxium for black.

This then changes all blacks to k100 and grey to k values.

I do not know how to make this profile in pitshop. I will so some more playing.

 

[mattbeals]

HTTP://WWW.Automatetheworkflow.com/cms/

 

[Lukas Engqvist]

Easiest way is to use AcrobatPro (9 or X) If colours are tagged with one profile, then you can convert to another CMYK profile (not as good as device link though, but you probably have it at your disposal)
Use the colour converter to tag the objects you want to convert with an appropriate ICC profile (ISO Coated v2, FOGRA 27 or some profile that describes your assumed source). If you do not tag with ICC data CMYK will not be converted from one profile to another. (2 profiles with the same measure data, but different separation tables can used to repurpose.)
Now use the Convert colours again. This time check convert to output intent and choose a profile with a more reasonable TAC and GCR (After checking the kind of objects you want to convert, images, text, graphics, all) then you may also check off preserve black, (and if you like preserve pure colours).
An output in intent is a document wide colour profile, document data is "document CMYK" and if you disable colour management you will get the colours you see in separations in Acrobat. It will by default simulate your output intent. Preferably save as a PDFx-1a (flattened) or PDFx-4 (unflattened).

 

[mattbeals]

Lukas, didn't think of that and I should have. Excellent idea.

 

[krankn]

I got black ink conversion to work with acrobat v9.

thanks for everyone’s help.