Converting Images to CMYK?

Just new to LR and was hoping someone could solve my problems Re: image conversion.
Is there a way to convert RBG images in Lightroom to a 'HighRes CMYK' so there press ready? Ive been searching but cant find anything. Hopefully they havent cut this feature out?
Cheers,
Adam

And not likely ever will be. CMYK will be viewable for DAM purposes but little else.
Don Ricklin, MacBook 1.83Ghz Duo Core, Pentax *ist D
http://donricklin.blogspot.com/

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Converting Images to CMYK for Print Publication

When in my workflow should I be converting images to CMYK for print publication?
Currently, I shoot RAW photographs with my DSLR in Adobe RGB, import the images into Photoshop for manipulation and then convert the final, sized image to CMYK before placing it in my Indesign document. Before going to print, I convert my files to PDF using the [PDF/X-1a:2001] preset. I use a calibrated system with a profile set for my monitor.
Since many of my pictures have shades of green, I'm often disappointed with the conversion to CMYK because I lose saturation and brightness. Am I doing anything wrong? Is there a better way of preserving the quality of colour in my images when going to a commercial printer?

To see in InDesign what color shifts will occur, use View=>Proof Colors.
I would also recommend View=>Overprint Preview.
Yes there are color shifts when converting RGB to CMYK, but those are due to the fact that the gamut of CMYK is significantly less than AdobeRGB or even sRGB. The same color shifts going to CMYK will occur whether you convert the image in Photoshop or in InDesign during PDF export or at the RIP.
Keeping the color in ICC color managed RGB has the advantage that last minute changes can be made as to what CMYK printing conditions are used, i.e. all CMYK is not the same. Furthermore, if you convert RGB to CMYK early in the workflow, you lose the ability to maintain the color gamut for display of the PDF as well as for printing to high fidelity color devices, i.e., offset or digital (especially inkjet) devices that have extra colorants such as light cyan, light magenta, orange, and/or green to dramatically expand the gamut. Once you lose the gamut in your imagery via conversion to CMYK, you can't go back.
- Dov

Does Lightroom convert images to CMYK?

I need to convert images to CMYK to submit photos for an article. I know Photoshop will convert, but don't know which software. If Lightroom does not convert to CMYK, which would I need to get?

p3vanisle wrote:
So I can locate the CMYK profile my printer is using, and install it into my design suite (PS, Illustrator, InDesign) and then export relevant filetypes in that color space? That would be terribley useful.
Yes, you have to install the profile on your computer. In Photoshop CSxx you go >Edit >Convert to Profile, and select the CMYK-profile under <Destination Space>. In Acrobat you go >Edit >Color Management, and select the profile under <Working Space>. But only Photoshop will convert the image to CMYK, whereas - at least for my understanding - Acrobat will display the image as if it were CMYK but not actually convert it.
If I do the conversion here (open their images in PS or Acrobat and convert the profile) aren't I still stuck in the 'I don't know what shade of pink you want that flower to be' still anyways?
If you get a RGB image from a client, you have to assume that the colors are as wanted. This is not different when you get a CMYK image. The problem for you is that nor everybody has a calibrated monitor, so an image might look good on their monitor but the actual color numbers will produce a print that looks different. But there is nothing you can do, except - if you have the time - adjust obvious off-colors. For instance you know the skin-color of caucasian (white) people. You know how green a lawn is, and you know that most brides wear a white gown. So if for instance the gown is blue-ish, or the skin looks overly pink, you can adjust that. More you cannot do. In case of a flower you can only accept the photo as is - unless you know this type of flower very well.
But the evaluation of color is only possible if you have a calibrated monitor that is re-calibrated regularly (every week or so). If your monitor is not calibrated you have no way of knowing if the off-color is due to the color numbers of the delivered image or a result of your un-calibrated monitor that displays the colors differently than the color numbers warrant.
If you use a calibrated monitor the colors should not change on conversion to CMYK. You can use the Softproof feature in Photoshop to check if colors are out of gamut.
- my degree is in design, yes, but we didn't cover printing and prepress specifics at all.
Yes, I have noticed in my work that the designers often have no knowledge about color management, printing, and pre-press. Good on you that you care and want to learn!
Keep on asking if you wish.

RGB mode in photoshop is highlighted red in the menu, even after converting image to CMYK..what does this mean?...

Like above. I just am about to send a project to the printer and need to make sure there will not be any issues during the printing process like the colors coming out weird, etc...

not sure how that got there
Might have been part of a Workspace.
what do you mean by used the correct CMYK space?
CMYK Spaces, usually described by an ICC profile, describe particular print conditions (print process, paper stock, raster width, …) and therefore simply converting to CMYK
• may be OK (if the print condition corresponds to the CMYK Working Space) but
• may also necessitate re-separation and avoidable loss of quality (if the target space and CMYK Working Space differ)

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.

How to convert sRGB images to CMYK retaining icc profiles?

I was given the follwoing info. but not sure it answers fully - it still doesn't resolve the problem of converting to CMYK with the icc profile. I think this might be an option if the profile is loaded into the colour setting (colour settings under edit menu as oposed to convert to profile and its convert to profile I have been trying to action. Am I missing something straightforward?
thanks!
you can do batch process in Photoshop
http://help.adobe.com/en_US/photoshop/cs/using/WSfd1234e1c4b69f30ea53e41001031ab64-7427a.h tml
-There is a fast and easy method to batch convert many RGB photographs to CMYK files by using Photoshop
-Please open an image, then open the Action Tab (Window > Actions)
-Please click 'Create new action' button, name the action in the text field and click the 'Record' button.
-Now it is recording, so select 'Image > Mode > CMYK Color', then hit the 'Stop' button in the Action Tab.
-The action is now created ready for the next step.
-To batch convert a folder of images, just select 'File > Automate > Batch' and the following window opens.
-Choose the 'Convert RGB to CMYK' action from the drop-down list, choose the source folder where your images are stored, then choose a destination folder where Photoshop will save the converted images.
-Click the 'OK' button and the batch process will start. How fast will depend on the number of images that need converting.
-The action you created will be stored, so you only need to perform a new batch process the next time you need to convert a batch of images.

I think we may need a little more information to fully address your question or issue. sRGB and CMYK are two very different color spaces, and converting from one to the other requires significant shifts in color. Are you refering to a specific input or output icc profile?

Converting a document containing RGB images to CMYK (with a profile)

Hi,
I am trying to use PDDocColorConvertPage to convert all RGB images in a PDF document to CMYK (with a color profile).
I can see the API is performing some changes to the PDF however it is not performing the conversion in the same way as Photoshop or Acrobat.
Has anyone tried to do this before? Am I doing it the correct way?
Thanks
Please see additional details below:
Input image:
Converted pdf: http://www.fallenempires.net/misc/out.pdf
Path = ASFileSysCreatePathFromCString (NULL, CMYK_PROFILE);
    err = ASFileSysOpenFile (NULL, Path, ASFILE_READ, &Profile);
    if (err)
        fprintf (stderr, "Unable to open the CMYK profile, \"%s\".\n", CMYK_PROFILE);
        exit (-1);
    ASFileSysReleasePath (NULL, Path);
    ProfileSize = ASFileGetEOF (Profile);
    ProfileBuffer = (ASUns8 *)ASmalloc (ProfileSize);
    ASFileRead (Profile, (char *)ProfileBuffer, ProfileSize);
    ASFileClose (Profile);
    ACMakeBufferProfile (&CMYKProfile, ProfileBuffer, ProfileSize);
    ASfree (ProfileBuffer);
colorConvertAction[0].mMatchAttributesAny = -1;//kColorConvObj_AnyObject;
    colorConvertAction[0].mMatchSpaceTypeAny = -1;//kColorConvAnySpace;
    colorConvertAction[0].mMatchIntent= AC_UseProfileIntent;
    colorConvertAction[0].mConvertIntent = AC_UseProfileIntent;
    colorConvertAction[0].mConvertProfile=CMYKProfile;;
    colorConvertAction[0].mEmbed = true;
    colorConvertAction[0].mPreserveBlack = true;
    colorConvertAction[0].mUseBlackPointCompensation= true;
    colorConvertAction[0].mAction = kColorConvConvert;
    colorConvertAction[0].mIsProcessColor = false;
    colorParams->mActions = colorConvertAction;
    colorParams->mNumActions = 1;
    colorParams->mInks = NULL;
    colorParams->mNumInks = 0;
    pageChanged = false;
    PDDocColorConvertPage( pdDoc , colorParams , 0 , NULL , NULL , 0 , NULL , &pageChanged );

In that case am I using incorrect parameters in the code snippet? The code below does not convert the RGB->CMYK properly.
    inPath = ASFileSysCreatePathFromDIPath( NULL, argv[1] , NULL );
    pdDoc = PDDocOpen( inPath , ASGetDefaultFileSys() , NULL , false );
    ASFileSysReleasePath( NULL , inPath );
    PDColorConvertParams colorParams = (PDColorConvertParams) calloc( 1 , sizeof(PDColorConvertParamsRec) );
    PDColorConvertAction colorConvertAction = (PDColorConvertAction) calloc( 1 , sizeof( PDColorConvertActionRec ) );
    ASBool pageChanged = false;
    AC_Profile workingProfile;
    ACGetWorkingSpaceProfile (kACWorkingCMYK, &workingProfile);
    //Populate the PDColorConvertAction data members
    colorConvertAction[0].mMatchAttributesAny = -1;//kColorConvObj_AnyObject;
    colorConvertAction[0].mMatchSpaceTypeAny = -1;//kColorConvAnySpace;
    colorConvertAction[0].mMatchIntent= AC_UseProfileIntent;
    colorConvertAction[0].mConvertIntent = AC_UseProfileIntent;
    colorConvertAction[0].mConvertProfile= workingProfile;
    colorConvertAction[0].mEmbed = true;
    colorConvertAction[0].mPreserveBlack = true;
    colorConvertAction[0].mUseBlackPointCompensation= true;
    colorConvertAction[0].mAction = kColorConvConvert;
    colorConvertAction[0].mIsProcessColor = false;
    colorParams->mActions = colorConvertAction;
    colorParams->mNumActions = 1;
    colorParams->mInks = NULL;
    colorParams->mNumInks = 0;
    pageChanged = false;
    PDDocColorConvertPage( pdDoc , colorParams , 0 , NULL , NULL , 0 , NULL , &pageChanged );
    printf( "page changed to CMYK\n" );
    /* save document to a file */
    outPath = ASFileSysCreatePathFromDIPath( NULL, argv[2] , NULL );
    PDDocSave(pdDoc, PDSaveFull | PDSaveLinearized, outPath, ASGetDefaultFileSys(), NULL, NULL);
    printf( "File saved\n" );

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).

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.

'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...

Convert image from RGB to CMYK and back to RGB

Hey.
I wonder if anyone has experience with converting image from RGB to CMYK and back to RGB?
I had a TIF in RGB then converted to CMYK but I figured that it might be better to keep in RGB, so I converted back. I read that it supposed to cause some loss in the data, but I can't see anything on the image, it is still very huge and the 2 RGB files has the same size as well. Is there a way to compare the resolution of 2 images somehow, or how can I see what I lost through the 2 conversions?
Thanks for help

I had a TIF in RGB then converted to CMYK but I figured that it might be better to keep in RGB, so I converted back.
The original RGB data is not being restored by converting from the CMYK version, so the term "keep" seems inappropriate.
What are the actual Color Spaces (ICC profiles) involved?
Is there a way to compare the resolution of 2 images somehow, or how can I see what I lost through the 2 conversions?
How did resolution come into this?
To determine how large a portion of the image has been changed you could
• make a flattened copy of the original image
• place a flattened copy of the RGB->CMYK->RGB image on top of that and set it to Blend Mode Difference
• add an Adjustment Layer (Curves for example) to brighten the image

How do I convert an AI - CMYK file to an editable PSD - RGB file ?

Trying to design my online components from a AI CMYK poster for an event...but I'm getting terrible pixaltion when I drag and drop the different elements into PSD...so clearly its not converting.
Is there a way to convert the Illustrator - CMYK file into and editable PSD file in RGB?
Any help would be awesome.
Cheers
Kirby

Here is a bit more detail, posted in teh /r/graphicdesign on Reddit
"Not sure if this is the right sub but I'm wondering if anyone else has experienced pixilation when uploading banner images for event with Facebook?
I'm exported this image http://imgur.com/vWV5OnN but when posted to Facebook it comes out like thishttp://imgur.com/sbhz94e
Any ideas whats happening?"
I designed the main poster as CMYK in AI- CS6
Then dragged and dropped the layers into a new PSD - CS6 file.
Maybe they arent' web safe colours?

How to tell if an image is CMYK?

Hi everyone,
I'm new to color schemes / printing, and I'm working with converting a file from RGB to CMYK and I have a few questions.
Before I start, you should know I'm just working with Pages '08, and I don't have Acrobat Professional, Photoshop, Illustrator, or anything like that.
First, how do I tell if a file is actually CMYK or not?
Second, is it only image files that can be CMYK - or can PDFs be CMYK as well? If PDFs can be CMYK, again, how do I tell if the file is actually in this format?
Thanks.

Hi,
If you need to know if an image is CMYK you can just so a simple Get Info on it (Apple + I) then click on More Info. This should tell you the colourspace of the image.
If you are worried about sending a Pages PDF to print then the best thing to do is speak to your repro company. I recently sent a Pages created PDF to a repro house for printing. It wasn't idea (as you can't set things like bleed and crop marks, which a printer may ask for) but in my case it printed fine.

Cannot completely convert PDF from CMYK to RGB

I have a 48-page CMYK pdf that was produced by Quark. All placed images are CMYK.
Using Acrobat X, I select Tools -> Convert Colors -> Convert Colors to Output Intent sRGB IEC61966-2.1, I am able to convert 99.99% of the document to RGB. However, a tiny portion of the document (a total of only 32 pixels) stubbornly remains CMYK. I cannot get a completely RGB PDF, and it's causing problems with our production process.
The parts that remain CMYK are miniscule. For example, there's an apostrophe on page 34, the top half of a comma on page 8. Examination of the uncompressed PDF reveals 3 tiny CMYK objects. Here's a typical object that is only 3x6 pixels.
5606 0 obj
<<
/ColorSpace /DeviceCMYK
/Subtype /Image
/Length 6
/Width 3
/Type /XObject
/BitsPerComponent 1
/Height 3
>>
stream
^Q^P^Q^P^Q^P
endstream
endobj
Also, at one point in the document is a reference to a /Separation of DeviceCMYK, which I don't understand (I assume this is item (1) in the report below:
3307 0 obj [/Separation /All /DeviceCMYK 4249 0 R]
endobj
When I produce a preflight inventory, it reveals four references to CMYK:
(1) Color Space 316 (out of 316)
on page 45
Color Space properties:
Separation color space: "Registration color" CMYK (1.0/1.0/1.0/1.0)
Color name: All
Alternate color space
DeviceCMYK color space
(2) Image 935 (out of 2432)
on page 48
Image properties:
Page 48: CMYK
Width/Height (pixel): 3/3
Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Compression/encoding
ZIP/Flate compression (FlateDecode)
DeviceCMYK color space
(3) Image 2233 (out of 2432)
on page 34
Image properties:
Page 34: CMYK
Width/Height (pixel): 2/5
Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Compression/encoding
ZIP/Flate compression (FlateDecode)
DeviceCMYK color space
(4) Image 2302 (out of 2432)
on page 8
Image properties:
Page 8: CMYK
Width/Height (pixel): 2/7
Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Compression/encoding
ZIP/Flate compression (FlateDecode)
Why can I not complete the CMYK->RGB conversion? And why do only 32 pixels out of millions in the document refuse to convert?
Is there a way to force the document colorspace and all colors to become RGB beyond what I've already done?

That might be it, Jacob.
It's when, for instance, I have the Appearance window open and shift-click on the stroke or fill to see the color attibutes (rather than simply looking at the swatches). It kept showing up in CMYK.
But making that change in the flyout seems to have it showing properly.
Thanks!

How to make a script to convert RGB to CMYK as black 100%?

Hi guy
my customer sent me a book (144 pages) for print but all of them are RGB and Tiff, she scan them. there are on the page some texts and pictures. The text are R=30 G=30 B=30.I think if I can make a script I will do it very soon to black 100%, but unfortunately I dont know anything to make script
anybody can help me ?anybody can make it for me ?

We need to know some more information.
1. The book consists of 144 pages, and each page is in fact an RGB image in TIFF format.
    Correct?
    That means, the text is already rasterized, but with low resolution (no more than 300ppi).
    A very bad starting point, in my humble opinion. For offset printing this is not acceptable.
2. Is the printing process offset printing or by digital printing?
Nevertheless we may think about a conversion of these images into CMYK K-only (one plate
per page) .
a) Increase contrast until R=G=B=0 for text.
b) Convert each image into Grayscale, using a so-called Black-Ink-Profile, for instance
    Black-Ink-ISOCoated-v2-eci (can be explained later)
c) Make empty CMYK image, here for ISOCoated-v2-eci, and paste the Grayscale into the
    K-channel. All further handling happens as CMYK file for the process ISOCoated-v2-eci.
    Void plates CMY don't matter.
    Post #12 here:
    Re: Colour shift (from CMYK = 0 0 0 20 to Grayscale K = 22 !)
All this can be done by an action (I hope so...).
Much better would be a new start by InDesign with typographical text (K-only vector instead of raster)
with images in RGB or CMYK, taking into account the intended process.
Note: Photoshop can deliver vector text, if exported as PDF.
Best regards --Gernot Hoffmann

Converting Images to CMYK?

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