Changeing color modes from rgb to cmyk

Good Morning Everyone,
I am editing a file for a Realestate customer of mine. For some reason her previous designer didn't understand to make print material in cmyk ( I cant believe how many "designers" dont understand the difference.). I am now going back and correcting that issue so they will print accuratly. Usually I can do this in Illustrator and just go to the edit menu and then go to edit colors and choose convert to cmyk. That option is greyed out in this situation. Does anyone no why? I am attaching a screen shot. I am using illustrator cs6 on a mac running 10.7.5.

What Jacob says but check that you Color Settings are set right for the type of printing in question. Otherwise the colours may not convert satisfactorily.

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Open the file with Preview, type Command + i to bring up the Info pane and it's color mode and profile will be listed as shown here:
To change the color mode to CMYK you'll need a 3rd party image editor like Photoshotp or GraphicConverter to do it. Why do you need CMYK?
OT

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I have over 900 barcodes provided in EPS format. When I open them in illustrator, they are coming in as an RGB color space file. I need them gray scale solid black in CMYK color mode. I can batch using actions to convert the artwork using "Edit Colors > Convert to Grayscale". However, the document color mode remains RGB. It appears, even after using "Convert to Grayscale", that the RGB color mode goofs up the placed .ai file in InDesign, treating it as RGB and seeing it as a mix of CMYK rather than the 100% black only it needs to be for proper sharp printing.
The actions pallet doesn't record converting the document color mode. Is there a way to automate that file conversion so they are all saved as CMYK rather than RGB, or am I stuck opening each of the 900+ files manually?

While recording the action, from the popup menu in the Actions Panel choose Insert Menu Item, then from the main menu choose File > Document Color Mode > CMYK color.

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When I try to open the document in Illustrator and I convert to CMYK the black font converts to rich black, but to set up for Offset printintg I need the text to be only in Black (100%K).
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I have tried that way, but the downside is that the fonts are set in gray not in a 100%K, also I have to deal with other fonts that are composites and meant to stay Full Color. I could select text by text and convert to gray but, its a 64 page document and I wouldn't want to make a expensive mistake.

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

Converting from RGB to CMYK makes the image dull. How do I fix?

I have an image that has a really bright vibrant blue in it. When I convert it from RGB to CMYK, it gets pretty dull. Is there a "trick" or something to do to a file after converting to CMYK to bring back some of it's vibrancy?

Sharingene wrote:
Question on workflow... so do I convert my sRGB to CMYK, work to fix different color issues using some of the methods above, then what? Where does the printer's profile come into play during all of this? UPrint told me for offset printing they use US Web-coated SWOP v.2. Just not sure what to do with this information
Whenever you convert, you're always converting from the source color space to the destination color space.
In this case, your source color space is sRGB, because that's the color space your file is in.
Your printer told you that the CMYK profile they use is USWebCoatedSWOPv2, so that's the destination color space you want to convert to. You can consider that the printer's profile.
So, how to convert?
There are two ways.
First, you could go to Image > Mode > CMYK. Easy, but maybe not right.
That method will convert to whatever defaults are set in Photoshop's Color Settings (Edit > Color Settings). Check out your Color Settings. If they are set to any of the North America presets, you're in good shape, because the CMYK default is USWebCoatedSWOPv2. However, let's say that the printer told you to use Web Coated SWOP 2006 Grade 3. Then you need to take a different approach...
Second way: go to Edit > Convert to Profile...
In the dialog that appears, click on the Destination pop-up and scroll to find the appropriate profile.
Click OK. Conversion done.
This is a more deliberate method that also gives you control over Rendering Intent. (That's another discussion. For now, use Relative.)
-I guess it's used in soft proofing but sure how all this works. If I soft proof and it's still not looking right, am I able to edit with their profile turned on some how?
A soft proof is an on-screen simulation of what your color will look like once you do the conversion. In your case, you would turn on soft-proof (command-Y) while still in sRGB to simulate the look of the CMYK color space.
To select the color space to simulate, go to View > Proof Setup.
Click on Custom...
Click on the Device to Simulate popup.
Scroll to find the destination color space.
Then when you hit command-Y, you'll see a soft proof of that color space.
Best practices suggest that you do the bulk of your color correction while still in RGB, but with soft proof on.
Also, should I get a profile for the paper I'm using as well?
That's what the printer's profile is.
Although I've read somewhere it's hard to have your monitor replicate paper because monitors are so bright....
Not exactly. The challenge in getting a visual match between monitor and proof/print is based on the fact that a monitor is emissive (i.e., it's a light source) and a print is reflective (i.e., it only reflects light that's hitting it.) However, in a proper, well controlled editing environment, it's possible to get a shockingly close match between monitor and proof/print. All the variables are controllable.
The bottom line with all of this is to be able to get accurate, predictable color on press (or out of your inkjet) based on what you see on screen. It can be done; I do it every day. It just takes some study and rigorous process control.
I humbly suggest that you check out my book.
Good luck!
HTH,
Rick
Rick McCleary
author, CMYK 2.0: A Cooperative Workflow for Photographers, Designers, and Printers
Peachpit Press

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Convert from RGB to CMYK

I've been trying to find solutions to convert images/pdf's from RGB to CMYK. I've noticed that it's definitely possible to convert from CMYK to RGB, but haven't been able to do the reverse.
Does anyone know of a method or a reference that might help me along?
Thanks!

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Feel free to close this thread (if you do such things here).

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I need to convert my pages project from RGB to CMYK. How can I do this?

Which version of Pages and can you be more specific about what file you have and what you are intending to do with it?
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I need to change the RGB values (imported from word) to specific CMYK values in Indesign (its not a straight swop) so I need a script or a similar plug-in that enables me to input the colour values for the CMYK so they automatically change.... the doc i work on is huge and im importing from a word file many times so i need to save time!!
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Hi Phil... Hmmm not sure if i explained myself! Or maybe I am being thick.... I tried the new code but im not sure I was clear on my problem?
This is the current code i use to change the RGN values to the CMYK is: I have entered the RGB and CMYK values as they need to be changed and it works but the swatch pallette ends up looking messy! See below.
var myIDOc = app.activeDocument;
var mySwatch = myIDOc.swatches;
for (var j=4; j<mySwatch.length; j++){
    try{
         if(mySwatch[j].space ==ColorSpace.RGB){
             if(mySwatch[j].name=="Word_R122_G75_B153"){// may be this is correct you can check the indesign swatches name
                 mySwatch[j].model=ColorModel.PROCESS;
                 mySwatch[j].space = ColorSpace.CMYK;
                 var myCV = mySwatch[j].colorValue=[48,72,0,0];
                 mySwatch[j].name = "C=" + myCV[48] + " M=" + myCV[72] +" Y=" + myCV[0] + " K=" + myCV[0];
         }catch(e){alert(e)}
var myIDOc = app.activeDocument;
var mySwatch = myIDOc.swatches;
for (var j=4; j<mySwatch.length; j++){
    try{
         if(mySwatch[j].space ==ColorSpace.RGB){
             if(mySwatch[j].name=="Word_R255_G0_B255"){// may be this is correct you can check the indesign swatches name
                 mySwatch[j].model=ColorModel.PROCESS;
                 mySwatch[j].space = ColorSpace.CMYK;
                 var myCV = mySwatch[j].colorValue=[0,100,0,0];
                 mySwatch[j].name = "C=" + myCV[0] + " M=" + myCV[100] +" Y=" + myCV[0] + " K=" + myCV[0];
         }catch(e){alert(e)}
var myIDOc = app.activeDocument;
var mySwatch = myIDOc.swatches;
for (var j=4; j<mySwatch.length; j++){
    try{
         if(mySwatch[j].space ==ColorSpace.RGB){
             if(mySwatch[j].name=="Word_R0_G0_B255"){// may be this is correct you can check the indesign swatches name
                 mySwatch[j].model=ColorModel.PROCESS;
                 mySwatch[j].space = ColorSpace.CMYK;
                 var myCV = mySwatch[j].colorValue=[100,0,0,0];
                 mySwatch[j].name = "C=" + myCV[100] + " M=" + myCV[0] +" Y=" + myCV[0] + " K=" + myCV[0];
         }catch(e){alert(e)}
var myIDOc = app.activeDocument;
var mySwatch = myIDOc.swatches;
for (var j=4; j<mySwatch.length; j++){
    try{
         if(mySwatch[j].space ==ColorSpace.RGB){
             if(mySwatch[j].name=="Word_R255_G255_B255"){// may be this is correct you can check the indesign swatches name
                 mySwatch[j].model=ColorModel.PROCESS;
                 mySwatch[j].space = ColorSpace.CMYK;
                 var myCV = mySwatch[j].colorValue=[0,0,0,0];
                 mySwatch[j].name = "C=" + myCV[0] + " M=" + myCV[0] +" Y=" + myCV[0] + " K=" + myCV[0];
         }catch(e){alert(e)}
var myIDOc = app.activeDocument;
var mySwatch = myIDOc.swatches;
for (var j=4; j<mySwatch.length; j++){
    try{
         if(mySwatch[j].space ==ColorSpace.RGB){
             if(mySwatch[j].name=="Word_R0_G0_B0"){// may be this is correct you can check the indesign swatches name
                 mySwatch[j].model=ColorModel.PROCESS;
                 mySwatch[j].space = ColorSpace.CMYK;
                 var myCV = mySwatch[j].colorValue=[0,0,0,100];
                 mySwatch[j].name = "C=" + myCV[0] + " M=" + myCV[100] +" Y=" + myCV[0] + " K=" + myCV[100];
         }catch(e){alert(e)}
var myIDOc = app.activeDocument;
var mySwatch = myIDOc.swatches;
for (var j=4; j<mySwatch.length; j++){
    try{
         if(mySwatch[j].space ==ColorSpace.RGB){
             if(mySwatch[j].name=="Word_R234_G229_B255"){// may be this is correct you can check the indesign swatches name
                 mySwatch[j].model=ColorModel.PROCESS;
                 mySwatch[j].space = ColorSpace.CMYK;
                 var myCV = mySwatch[j].colorValue=[8,10,0,0];
                 mySwatch[j].name = "C=" + myCV[8] + " M=" + myCV[10] +" Y=" + myCV[0] + " K=" + myCV[0];
         }catch(e){alert(e)}
The outcome is the swatch pallette attached:
How do I incorporate the new code to make sure all the values are hopefully to end up looking similar to this!!??
Thanks for all your time and effort helping me!
babeanz

Is there a trick to converting JPG from RGB to CMYK without the lossy re-compression?

So I've got around 750 images in multiple categories and folders. Each image has 6 variants - 16 bit TIFF from over-eager beaver photographer, 16 bit TIFF, extracted backgrounds (done by student workers, who do not use English as we are not in the US), then, standardized 3000x2000 (or other suitable aspect ratio) PNG with corrected edges for web and light print, an 1800x1200 JPG for web and a few smaller PNG standards also for web.
The 16 bit TIFFs with Extracted BG are the root files, and a series of actions builds the PNG's. The standardized PNG's are then pumped through actions and Image Processor to create output files.
So I just discovered that a seemingly random number of these are in CMYK. That hasn't been a problem up until now because our website and our printed materials have no problem with CMYK and RGB files.
But now we are starting to hand out these images to our customers - who are only interested in the 1800x1200 JPG and maybe 900x600 PNG files, which are most easily pulled directly from our website rather than sending them the entire 180gb graphics directory.
And some of them are telling us that the pictures are being rejected. Most notably, Ebay does not allow CMYK files.
So damage control- rebuild our entire library of images from the 16 bit TIFFs
OR
rebuild only a couple of different sizes and upload from there, replacing the pictures on the next major update (over the next year).
I am *NOT* concerned about preserving color since 99% of our products are black and shades of grey, with only a hint of color.
I am concerned about the degradation of changing mode on 60-70% compressed images, then resaving again with the lossy JPG compression.
I'm about to start ripping into things with my actions and replacing around 1500 files online, so I'd like to be sure that I'm doing things in the most sensible way.
If there's a tool that can do this conversion without another pass of compression, that would be ideal.

My understanding of the JPG is only middling. I thought I understood that it uses anchor pixels and either a translation table of some sort or difference mapping, using 8 bits per piece of information.
If that were the case, surely changing the translation from CMYK to RGB would be fairly simple.
In this case, the usage is Ebay and they only accept JPG, PNG (and maybe BMP and GIF, I didn't look that closely), but require RGB. I was actually quite surprised to find that JPG allows CMYK since, as you say, anyone dealing with CMYK is going to be dealing with commercial printing and few people who deal with commercial printing would play around with JPG.
I always stick to TIFF or PSD for workflow, but JPG is popular for a reason - when it comes to web, JPG is the only format that can deliver manageable file sizes with full-screen or "large" images for web. Our top level banner photo is 2590x692 and needs to be under 400kb for sane download speeds. PNG couldn't touch that. Even with the aforementioned 1800x1200, PNG is nearly 2mb, while I can maintain very decent quality with a 500kb file with JPG that works well for 'zoom in' type usage.
So there's no way around JPG. It's just annoying that the first person to touch a random selection of the pics was primarily an Illustrator user and saved *some* of the pics in CMYK mode.
It's like that old story about the farmer who didn't want anyone to steal his watermelons, so he cleverly posted a sign "None of these watermelons are poisoned", only to find a note the next day saying "Now, One of these watermelons is...".
Far more work to fix 'some' of the images compared to just doing it right the first time.
But then again, for workers like that, if you can't trust them with an easy job, you could hardly trust them with more complicated jobs...

Cannot change Color mode

Hello,
I was provided a file from a customer that is RGB. I need to change it to cmyk for printing. HOwever I cannot change the color mode. All my options in the Mode section under Image are greyed out. I have never seen this happen before.. Here is a screen shot of the Mode.
The image has been flattened. I am using PS cs6 on a mac. I have never seen this happen before. Does any one have any ideas?

Strange. Could the file permissions be set to lock you out?
In the Finder, do a Get Info in the file and look at the permissions. If at the bottom, your name says "read only," then you need to change the permissions to allow you to read AND write.
To change permissions, use BatChmod, but be careful to change the permissions on that file ONLY.
It's FREE at:
http://www.lagentesoft.com/batchmod/index.html
... And if that doesn't solve the problem, can you share the file?

Conversion from RGB to CMYK

Hi,
I would be so grateful if someone could help! I need to submit a PDF of a book I have written to the printers. They tell me that they are printing in CMYK. My book has many paintings inside and two use RGB mode (others are CMYK). I have tried converting these to CMYK however they loose their colour variations and brightness. It is important that the colours remain the same. Is it necessary that I convert these to CMYK (my printer said he would try printing samples of the PDF's I've sent in RGB mode and see what happens). I am worried since when I export the book to PDF I get a big exclamation mark warning me not to proceed since all is not in CMYK. Is this simply a caution or is there any reason for real concern. Help!
Thank you, Rachel

There's no way to tell what the settings are from what you've posted. This is a modification of the [High Quality Print] predefined preset, which DOES NOT convert colors to CMYK, but without going through the panels there's no way to know what was modified.
Whatever settings you end up using, you must look at the "output" panel and check what it says under color. If you are expecting the output to convert RGB to CMYK you must set that field to one of the "Convert to Destination" settings, and under destination you must choose the correct profile for your printer conditions.
Choosing "Convert to Destination" and a profile that doesn't match your document CMYK working space will result in the appearance of colors being preserved, but all of your native CMYK elements, including your black type, will be converted tot he new color space, and more than likely your type will now be a four-color rich black instead of K only, which is a printer's nightmare.
Choosing "Convert to Destination (Preserve Numbers)" will keep the CMYK values for native elements, which will preserve your solid blacks, but will result in some color shifting as the numbers are re-interpreted in the new space. This is roughly equivalent creating a document in one working space, then ASSIGNING a new working space before export.
Peter

How do I change my pictures from RBG to CMYK?

Can somebody tell me how to change my pictures fromm RBG to CMYK? I am using quarkexpress9 to write my second book but the program is locking up on me because it want's my pictures in CMYK instead of RBG so I bought first lighthouse5 and now photoshop elements in an effort to change them from one to the other but can't figure it out. I found some directions online on how to do this in photoshop but it doesn't make sense, it says go to EDIT, COLOR SETTINGS, and then from the drop down menue select blah blah blah. There is no drop down menu, just a list which allows me to choose, No Color Management, Always Optimize for computers, Always optimize for printing, or Allow me to choose. So... what gives?

Work with RGB. I don't know Quark in the latest version, but modern print software does not need CMYK images.
Re: Re: Converting Images to CMYK for Print Publication

When printing a photobook does Apple convert the images from RGB to CMYK?

I'm a little confused by Apple's Photobooks. Most printers require all images to be in the CMYK colourspace, since the inks used are always CMYK. Yet Apple requires Photobook images to be jpegs in the RGB colourspace. Does this mean Apple's printers (presumably plural, since they are all over the world) do some sort of autoconversion RGB to CMYK? Surely this would result in a major downgrading of quality? I've seen a few non-Apple photobooks printed with unconverted RGB images, and they look dreadful - overblown red and yellows, with awful colour casts. I've not seen an Apple Photobook myself, presumably the colours are realistic?
Comments anyone?

Quote from the Reference:
Linear Light
Burns or dodges the colors by decreasing or increasing the brightness, depending on the blend color. If the blend color (light source) is lighter than 50% gray, the image is lightened by increasing the brightness. If the blend color is darker than 50% gray, the image is darkened by decreasing the brightness.
Now consider the values that a neutral medium grey would have in the RGB and the CMYK spaces you use.

Changeing color modes from rgb to cmyk

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