Convert RGB black to CMYK black

PHOTOSHOP CS5
I have a complex black-ink line drawing in large precentages of C, M, Y, & K. I'd like to somehow SELECT ALL PIXELS and zero out all but 100% K.
I cannot figure out how to select all (nonbackground) pixels (no, Select>All does not accomplish) and then make them all 100%K, can you help?

Yes, I need to end up CMYK. As you can see by my sample Photoshop converts RGB to crazy-high CMYK percentages. All I want these lines and text to be is 100% K.

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Script to convert RGB values to CMYK values

I want a script that can help me convert RGB value to CMYK values.
I've seen this thread which explains a script to round up and down:
http://forums.adobe.com/thread/1079041
but is there a script that i can actually define lets say the colour is yellow and in RGB it looks ok because its in RGB mode so you change it to CMYK and you have 6% - 9% cyan and you only want yellow
is there a script out there that i can say
if
cyan = 6%
yellow = 80%
magenta = 0%
black = 0%
then change to
cyan = 0%
yellow = 80&
mangenta = 0%
black = 0%
I don't mind writting the code for each colour that needs to be converted as it would only need defining once but how would i make this script?
any clues?

Hi Carlos,
I've got a bit further with applescript as i've used it a little but i've got an error this is my code so far:
tell application "Adobe Illustrator"
          if exists color is equal to "C=0 M=0 Y=0 K=90" then
                    set color to "C=0 M=0 Y=0 K=100"
          end if
end tell
The error i'm getting is "can't get color"
the color is there however i believe i must not be using the correct variable any clues?

Is there as easy way of batch converting RGB files to CMYK in OS Lion?

Is there as easy way of batch converting RGB files to CMYK in OS Lion?
I was using a photoshop droplet on my desktop but this no longer works due to the fact it requires rosetta support.
Thx P

From another forum after googling:
Your computer came with everything you need, because ColorSync can do that and Apple provided AppleScripts for it. Go to your Applications folder and look for the AppleScript folder. Double click on the 'Example Scripts' alias and then open the ColorSync scripts. Drag and drop your images on the the 'Match to CMYK' script.
You can open AppleScript Editor from Launchpad (it's in Utilities). Go to Help to Open Example Scripts Folder. In the ColorSync folder is a Match application. Double click to make it run.
Now you know what it does you may need to change it for batch conversion.
Go to AppleScript Editor and open what you've just found. And I'm sorry that's as far as my knowledge goes, hope some one can fill in the gaps.
Or you may just want to look at something like Graphic Converter?
Regards,
Colin R.

Converting RGB PDF to CMYK PDF

I'm looking for a way to convert RGB PDF's to CMYK PDF for printing purposes. The RGB PDF is created by an online Flash application and I'm hoping to convert the file using Acrobat via Command line. I have tried a couple of programs e.g. PStill and PDFcreator but these just don't do the job. It's important to use the command line due to the fact that the conversion must be done automatically on a dedicated server.
Important to know is that the PDF consists of texts and images and gradients. This is a RGB example which I would like to convert. This is the CMYK output I have created manually.
Other solutions next to Acrobat are also welcome as long as they do the job

In your original message you say "the conversion must be done automatically on a dedicated server" - this implies that Acrobat is being used outside the EULA, which strictly forbids installation as a server process. Acrobat is licensed for individual interactive desktop use by one person, no other deployments are allowed.
You cannot access Acrobat's editing and batch-processing functions from the commandline at all. Adobe has server-based solutions for PDF generation (LiveCycle ES3) but they are extremely expensive and would need work to get them to do what you're looking for. Realistically, your Flash developer needs to recode his app to output in CMYK or you will need third-party software on the server to re-fry the files. I don't know of any off-the-shelf commandline tools which can perform color conversion on existing PDFs.

Converting RGB pdf to CMYK in acrobat 8 professional

Hi Can anyone tell me why when i convert an RGB pdf to CMYK using convert colours in Advanced/Print production the image resolution changes as in you get a haze around the text etc!! it looks like the pdf was created in photoshop or the original image was from photoshop could it have anything to do with jpeg compression?? if so how can i get round this in acrobat i dont want to have to save as postscript and pdf it again in distiller everytime!!
thanks
whitey!!

Hi Jon
Sorry its been so long!!
do you have an email i could send the before/after too??

How to batch convert RGB images to CMYK

Hello,
Can anyone explain in a step-by-step way how to batch-convert many RGB images to CMYK?
Thanks in advance

If you do want to use Photoshop for the bact conversion there are a few ways, including Batch and Image Procesor under the File>Automate or File>Scripts of PS.
However, my preference is to use Russell Brown's script: Image Processsor Pro, via Bridge:
http://www.russellbrown.com/scripts.html
As similar one is Picture Processor:
http://www.scriptsrus.talktalk.net/
Both allow you to do multiple conversions simultaneously, to different sizes and file types, and running actions before or after the conversions.

Acrobat 8 - Settings to convert RGB colours to CMYK

Hi,
I create A1 & A0 size maps as adobe pdfs. The mapping software I use will only allow me to select R G B colours which is fine and produces the maps with the exact colours I want. However, when I want to print my pdf maps the large format printers I have access to always want to convert my RGB colours to CMYK which makes the colours dull on the printed map compared to the pdf. Are there any settings that I can alter in Acrobat 8 which will convert the RGB colours to CMYK during the pdf creation process. I will then be able to alter my RGB colours if necessary to get the right end result. I am not super technical so if there is a reasonably simple solution that would be great.
Thank you for any help you may be able to give.
Stephen Kilbee in the UK

I think you will have to copy the watermarks and such to the corresponding folders in AAXI. I do not think that they will migrate in the way that you are thinking. It may take a bit of time to find the appropriate folders and files, but this is likely how I would try it. I was not concerned about it myself and did not try to copy such things.

Help converting RGB Images to CMYK?

I am working with a CMYK Freehand design, and it includes a
cut out image on top layer. The image is in RGB. When I export it,
I am getting a colour shift on the transparent areas.
Should I be working with a CMYK cut out image? If so, how do
I convert my RGB image to CMYK, keeping the transparent areas of
the cut out?
Help much appreciated (ASAP)
Regards
Geoff

GmR wrote:
> I am working with a CMYK Freehand design, and it
includes a cut out image on
> top layer. The image is in RGB. When I export it, I am
getting a colour shift
> on the transparent areas.
>
> Should I be working with a CMYK cut out image? If so,
how do I convert my RGB
> image to CMYK, keeping the transparent areas of the cut
out?
>
> Help much appreciated (ASAP)
> Regards
How are you creating the transparent areas? Are you using an
alpha
channel in the bitmap? I stopped doing that when I noticed
color
shifting (even in grayscale reproduction) similar to what you
get when
using the raster effects. But I do miss using it because it
is
convenient and sets up nicely.

CS2 Convert RGB Images to CMYK Within Illustrator

Hey everyone. I desparately need some help here. I designed a file in Illustator CS2 and my file had images within it. I took it to a professional printer and he said my images needed to be converted from RGB to CMYK to print properly. The printer had CS4 and he said to change the colours you click on Edit -> then Colours, which in turn allowed him to change the pictures format from RGB to CMYK. I only have CS2 and when he told me to select Edit and then Colours, well CS2 does not have that. It's something completely different.
If someone out there knows how to change the picture files from RGB to CMYK "within" Illustrator CS2 could you please tell me how as Adobe's phone support only deals with the most current version.
Any help you can provide me with, would be greatly appreciated!
Thanks in advance,
Julie

>This is for my benefit as I have just purchased a colour laser printer and wanted to be able to print something proper like the professional printer.
Unless you have a PostScript RIP for your laser printer (a separate driver provided either by your printer manufacturer or a third party) you cannot proof CMYK documents directly. Lacking a PostScript RIP, you can still get a pretty good idea if you have Acrobat. Print to PDF using settings that convert to, say, sRGB... then, print that PDF document on your laser printer (using its native non-PostScript driver).
For your older documents, if your placed RGB images are embedded (rather than linked), you can try Philip's suggestion. It shouldn't matter, though. Illustrator should do the necessary space conversions at print-time.
If the images are linked, I would suggest you convert them to CMYK in Photoshop. I'm sorry, but I do not know of a way to do the same thing within Illustrator (v12 aka CS2).

Rich black when converting RGB to CMYK

I'm working in an older version of PhotoShop (7) but any help on the topic would definitely help.
My problem is that I am converting RGB native images to CMYK and my Key (Black) comes out rich, contains equal levels of CMY and K, instead of true black, only k.
Currently my way around this is to do the standard convert to profile CMYK and with my path selected to the section I would like to be true black simply turn off all CM and Y channels and re-save the image but this is a little labor intensive.
Is there a way that I can go straight from RGB to CMYK and achieve true black without alteration?

Yes, there is. You can use a CMYK setup or ICC CMYK profile that uses Maximum black generation. Unfortunately, that will almost always hose anything photographic in your image.
Is it typographical elements that are becoming four color? If so, then they should be done in a page layout program where they can be rasterized separately from the photographic image. If it is type you're worried about, is it large type or small? If you have to set large type in Ps, then it's probably fine to let it run four color.
If it were me and I had to do everything in Ps, I would probably make two conversions of the file to CMYK - one with a standard black generation and one with Max K. I would then select the black you want from the max K version and paste into the K channel of the "normal" document, and then use that as a selection to delete from the other three channels.
A third way is to do type in Ps and leave the type as a vector type layer, then save the file out as a Photoshop PDF, which is then placed in a layout app. or just sent to the printer through his RIP. That should work too, but there are too many places for things to wrong for my taste.

'greyscale' RGB image, need to convert to specific CMYK black... how?

Hi,
I have an image provided in RGB, but visually it's greyscale, except for some red areas on certain clothing. I need to convert it to CMYK, and I want all the black areas to be 40/30/20/100, and the grey values should be percentages of this mix. The red should be visually unaltered. Im using CS3 btw.
Is there a way to quickly do this? I can convert to a generic CMYK value then tweak the curves of each channel, but it will affect the red. I could make a selection to exclude the red, but i feel there must be a way for me to define my black, and convert, and for my wishes to be granted automagically.
I tried redefining my default black in the foreground/background swatches, but that had no effect on the subsequent conversion.
Also, I'm trying to avoid profiles as my brain is foggy in that area...
Thank you,
Simon Gregory

Without seeing the image, it might be a shot in the dark, but what about creating a new CYMK document, of the same size as the RGB one. Add a layer filled with the 40/30/20/100 black.
Go to the RGB image, In the Channels panel, drag the red channel to the new channel icon. Drag this new channel to the CYMK channel panel. Add a layer mask to the 40/30... layer. go back to the channels panel, and target only the copied channel, copy it, target the layer mask channel, paste. Target the Layer mask, invert it.
Now, select and bring the red part from the RGB image, and you should be good to go...

Converting 4-Color Blacks to 100% Black

Is there a way to convert 4-Color Blacks(Rich Blacks) to 100% Black? For example today I got a file that was CMYK 4 Color however the blacks in the PDF file were not 100% Black is there a way to convert the 4 Color Blacks to 100% black in Acrobat? I don't want the whole PDF to be Greyscale. I still want the color but I want to specifically target the 4 color blacks and turn them to 100% black. Can this be done? I am using Acrobat 8.

It's possible but not easy.
You first need to identify exactly what the "rich black" in the document is - 4-plate CMYK, RGB, etc. then create a Preflight Check that finds only that color combination, with a second item in the check to filter only by text objects.
You can then use it as the trigger item for a Convert Colors preflight fixup, applying something like a dot gain 30, which will blow the rich black out to 100K.

Some RGB files produce no Black Separation

We are a commercial printer. I've seen pages on many jobs recently where RGB images are converting to CMYK using SWOP profile, but no black sep information is present. The image separates into 3 colors only. When exporting from ID, we suggest leaving color unchanged, since our RIP has always done a great job of converting RGB to CMYK. Has anything changed in CS5 that would cause this?

There has been no changes in Adobe color management since at least CS2. Color management is turned on and is unified throughout the Creative Suite if you're using default settings.
Choose Edit > Color Settings and see if your InDesign settings are Synchronized with the Suite.
If you're outputting directly from InDesign, you might try resetting your InDesign preferences. Perhaps something has gotten screwed up:
http://forums.adobe.com/thread/526990

How convert a color pdf to black and white pdf...? new acrobat in creative cloud cs6

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Print Production << where is this in XI...?

How to convert a coloured document into black and white pdf .

I have to write a script in c++ to convert a coloured document into black and white pdf .can anybody help.

You've posted on a forum dedicated to discussions of a resource center called the "Adobe Exchange" that has nothing at all to do with Acrobat.

Convert RGB black to CMYK black

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