Having troubles converting RGB to CMYK

@Hi guys
I having massive issues with converting my business logo form RGB to CMYK. I need to place this logo on my business card ready for printing. I created the logo in RGB format to start of with, but it keeps coming out darker and abit grayscaled
once the conversation is set. Can anyone help me out with this issue, and if so, can you also provide the steps in how to resolve this issue for future references. Im using Adobe Photoshop CS5 for this execise. I can also provide the actual image attached below as the second image,.

These bright pink and purple colours are obviously way out of gamut so they convert badly to CMYK. Exactly how they convert depends on what colour profile you are using
It will probably be best to either rework the design using mixtures of cyan and magenta only or else use mixtures of Pantone colours.
The Pantone solution will only work for offset printing but is no use for a home printer.
Read up on colour management like Mylenium says and learn to think in terms of inks rather than screen colours.

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ICC profile to convert RGB to CMYK,   jpeg is ok, png format have a problem

When I use ICC profile to convert RGB to CMYK, jpeg format is ok, but png format have a problem.the color is lossy.
It means, the png file color is shallow than jpeg file after convert.Could anybody help me?
thanks
source code
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import org.w3c.dom.Node;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class TestImage {
     public static void main(String args[]) throws ImageFormatException, IOException{
          BufferedImage readImage = null;
          try {
              readImage = ImageIO.read(new File("C:\\TEST.jpg"));
          } catch (Exception e) {
              e.printStackTrace();
              readImage = null;
          readImage = CMYKProfile.getInstance().doChColor(readImage);
          writeImage(readImage, "C:\\TEST_after_.jpg", 1.0f);
    protected static String getSuffix(String filename) {
        int i = filename.lastIndexOf('.');
        if(i>0 && i<filename.length()-1) {
            return filename.substring(i+1).toLowerCase();
        return "";
    protected static void writeImage(BufferedImage image, String filename, float quality) {
        Iterator writers = ImageIO.getImageWritersBySuffix(getSuffix(filename));
        System.out.println("filename�F"+filename);
        if (writers.hasNext()) {
            ImageWriter writer = (ImageWriter)writers.next();
            try {
                ImageOutputStream stream
                    = ImageIO.createImageOutputStream(new File(filename));
                writer.setOutput(stream);
                ImageWriteParam param = writer.getDefaultWriteParam();
                if (param.canWriteCompressed()) {
                    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);//NO COMPRESS
                    param.setCompressionQuality(quality);
                } else {
                    System.out.println("Compression is not supported.");
                IIOMetadata metadata = null;
                if(getSuffix(filename).equals("png") || getSuffix(filename).equals("PNG")){
                     ImageTypeSpecifier imageTypeSpecifier = new ImageTypeSpecifier(image);
                     metadata = writer.getDefaultImageMetadata(imageTypeSpecifier, param);
                        String sFormat = "javax_imageio_png_1.0";
                        Node node = metadata.getAsTree(sFormat);
                        IIOMetadataNode gammaNode = new IIOMetadataNode("gAMA");
                        String sGamma = "55556";
                        gammaNode.setAttribute("value", sGamma);
                        node.appendChild(gammaNode);
                        metadata.setFromTree(sFormat, node);
                writer.write(null, new IIOImage(image, null, metadata), param);
                writer.dispose();
                return;
            } catch (IOException ex) {
                ex.printStackTrace();
}

Hi,
I am having similar problems. I have read somewhere that png format can not handle CMYK colorspace anyway, which I find odd (and plainly stupid IM(NS)HO) which would mean that converting to RGB and therefore using profiles is mandatory.
May be you should check if the internal format of the png files claims it is RGB or CMYK (using ImageMagick's "identify" command for example).
HTH
JG

I'm having troubles converting my raw files from Nikon D5200 (NEF) to DNG. I tried using Lightroom 4, but it didn't identify the folder containing the files. So i downloaded the latest DNG converter but that too didn't identify the files kept in the folde

I'm having troubles converting my raw files from Nikon D5200 (NEF) to DNG. I tried using Lightroom 4, but it didn't identify the folder containing the files. So i downloaded the latest DNG converter but that too didn't identify the files kept in the folder location. So I downloaded DNG converter v7.3 for D5200. It identifies the folder and files; but it is giving me parsing error on trying to convert files. I'm running Windows Vista Home Edition SP1. Kindly advise. Thank you.

I probably missed this detail in what you’ve posted, but do you see the thumbnails of the three cameras’ raw files in Finder if you don’t convert to DNG?
What has happened in the past is that the Apple raw interpreter doesn’t read thumbnails of DNGs it doesn’t like, where at least one thing it didn’t used to like was embedded lens corrections for mirrorless cameras. Are the Olympus and Panasonic mirrorless—meaning there is no optical viewfinder and everything is seen on an LCD screen or perhaps an electronic view finder? If so the reason these are different is that the camera is doing the lens distortion corrections automatically and this information is stored in the raw files and in the DNGs but Apple doesn’t know how to use these embedded lens corrections or doesn’t know how to read the newer DNG spec that does allow for this information to be embedded in the DNG, at least.
Apple could just extract the embedded jpg preview and ignore the other parts of the file it doesn’t understand, but it apparently doesn’t do this.
What I’m not sure about is if the Apple raw interpreter still has this problem or if you’re on an older system without the latest updates for camera raw decoding by Apple.

Hi, cannot convert RGB to CMYK...

I cannot find such an option in the Elements? Can anyone help how can I convert the files to CMYK from RGB using this tool...
Thanks
ansu

Elements can't convert RGB to CMYK. You'd need the full Photoshop.
Otherwise you can google 'RGB to CMYK' conversion to find online or software tools that can do that.
The real question is why do you need CMYK. If it's a request from a printer shop, it's their job and responsibility to do the conversion, since such a conversion can only be properly done when you know the specificity of your printing tools, inks and papers.

Color converting RGB to CMYK mode???

Is it possible to convert RGB to CMYK color mode in Elements 10?

No, not really. If you google around, Richard Lynch had a sort of workaround for this for very early versions of PSE that could possibly be adapted for current use, but a proper CMYK conversion is much more complex, even with the proper tools, than going from sRGB to Adobe RGB, for example.
If you have a mac you can do a mode conversion in Preview, but you may not like what you get from the print shop using that method.

Converting RGB to CMYK color

Hi All,
I have few BASIC Questions on converting RGB to CMYK in Photoshop and Illustrator. Hope could get some professional insights here.
1, Are all the DTG printers set only in CMYK color mode ?
2, If there is no difference after viewing RGB image with 'Gamaut Warning' (Photoshop), Does that mean I'll have the exact print result as monitor view ?
and Basically no need for CMYK conversion ?
3, Please list some the most effective way to convert RGB to CMYK, and keep the final CMYK color result as close as the RGB.
4, when I simply convert one RGB image to CMYK color, why Ps/AI don't allow me to save as PNG file ?
( I save the file as PDF, but I cannot edit this PDF using apple preview app )
5, compare Photoshop to Illustrator, which one result better final CMYK color image ?

Thanks for the detailed reply. Sure clear some of the doubts.
I just start to draw/design in Photoshop and illustrator, I save my files most as PNG, for a transparent background.
After I went to officework do the poster printing, I found the color of my print image are not as vivid as Mac preview.
To be precise, the poster I printed looks like has a very thin grey layer, it is not much noticeable, but it indeed lost some vivid color. As I want to print out my works and keep color as close exact as Mac preview, here is the issue of coverting RGB CMYK.
Please feel free to add for below:
1, Should I set color space in CMYK before drawing in PS/AI
2, in PS, I convert profile from PNG file to CMYK save as psd file, that psd file preview exactly same as PNG.
But when saved as PDF, the file preview a bit grey. Can someone explain this?
3, Now im thinking, since CMYK is all about printers, it really should be the profession in printing shop who shall check my image, and edit/convert to the right color space to fit their printers.

Convert rgb to cmyk in bridge

I am working on a MAC & Photoshop CS2. I
need a how-to action for converting RGB
to CMYK & how to image process it in Bridge.
Many thanks.

If you create an RGB>CMYK action in Photoshop you can easily pick images in Bridge and call up a Batch operation from within Bridge...but it's Photoshop doing the work cause Bridge ain't an image processor (as others have said).

I'm having trouble converting my RAW files to jpegs. Even though my RAW files are 90MB plus, the jpegs when converted are only around 6MB. Am I doing something wrong? Thanks, A

Dear Forum,
I realise this isn’t necessarily your problem, buy I’m having trouble converting my RAW files to jpegs.
Even though my RAW files are 90MB plus, the jpegs when converted are only around 6MB.
Am I doing something wrong?
Thanks,
A

HHi Barbara, thanks for replying to my post.
No there's nothing wrong with the Jpegs, but I want to srart uploading images for sale in Alamy, but they say they must be a minimum of 17mb un compressed. Does that mean that at 6mb compressed from 90mb they'd be acceptable?
thanks,
alex

Having trouble converting array to spreadsheet string, storing the file and coverting back to array with complex numbers

I am working with a network analyzer. I have arrays made of 5 columns the first consisting of an integer and the next four consisting of complex numbers. I am converting the array into a spreadsheet string and then saving the file using the write characters to a file VI. That seems to work well as when I open the file in Excel all the data is there. However when I try to reverse the process, open file and convert back to array, I loose some of the data. Specifically the imaginary parts of my complex numbers are all going to zero. I have narrowed down the problem to be in the conversion from spreadsheet string to array and vice versa. I
think the problem may be with the 'format' input to the VI. I do not have an adequate resource for this so I am not sure what to put in to accomplish my task. Any takers?

Hi Biz
I don't think there is a direct way of converting a complex number to a
string, so when you convert the array to a spreadsheet string, the
numbers would be converted to real data.
However, you could try separating the real and imaginary parts using the
"Numeric: Complex to Re/Im" function, and then store these - either in
separate files or in adjacent columns/rows in the same file. Then, when
you read in the data again, use the "Numeric: Re/Im to Complex" function
to put the two "halves" together.
If you actually want Excel to interpret the numbers as imaginary, then
you'll probably want to create a string for each complex number of the
form "Re + Im*i" (after separating the Re and Im parts), by using
"String:Format into String" with 2 numeric inputs and the format string
"%f+%fi".
Reading the data back into Labview then would require splitting the
string into the 2 pieces by using "Stringcan from String" with 2
numeric outputs (smae precision as original numbers specified by the 2
Default Value inputs) and the same format string "%f+%fi", and then using
the above-mentioned "Numeric: Re/Im to Complex" function. It worked for
me, so if you can't follow what I am describing, send me an email and I
can email you what I did (LV 5.1.1).
Paul
Biz wrote:
> Having trouble converting array to spreadsheet string, storing the
> file and coverting back to array with complex numbers
>
> I am working with a network analyzer. I have arrays made of 5 columns
> the first consisting of an integer and the next four consisting of
> complex numbers. I am converting the array into a spreadsheet string
> and then saving the file using the write characters to a file VI. That
> seems to work well as when I open the file in Excel all the data is
> there. However when I try to reverse the process, open file and
> convert back to array, I loose some of the data. Specifically the
> imaginary parts of my complex numbers are all going to zero. I have
> narrowed down the problem to be in the conversion from spreadsheet
> string to array and vice versa. I think the problem may be with the
> 'format' input to the VI. I do not have an adequate resource for this
> so I am not sure what to put in to accomplish my task. Any takers?
Research Assistant
School of Physiotherapy, Curtin University of Technology
Selby Street, Shenton Park, Western Australia, Australia. 6008
email: [email protected]
Tel. +61 8 9266 4657 Fax. +61 8 9266 3699
"Everyone who calls on the name of the Lord will be saved." Romans 10:12
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Jesus." Romans 3:23-4

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

Problem when converting RGB to CMYK in illustrator CC

Today I realized I had my document in RBG mode rather than CMYK. I am drawing die lines over a CMYK TIFF file placed in the document. When I try to convert my illustrator document color mode from RGB to CMYK everything in the document goes white - including the CMYK TIFF file that I have placed in it.
I can highlight the paths and see them only when they are highlighted but Illustrator will not allow me to select a new color for them.
In older versions of Illustrator I have had it would seamlessly convert to CMYK without changing everything to white.
I tried creating a new document with CMYK color mode and pasting the items in and it still goes all white.
In illustrator CS3 it converts just fine from RGB to CMYK with no image loss and no color loss on my dieline paths. but because my version of CS3 is acting crazy it won't allow me to save files from it
any help appreciated!!
thank you so much

hi monika!
no they are just plain old paths in black. and the TIFF file is just a regular TIFF file that is being placed on the bottom layer.
thanks for any help!!

Convert RGB to CMYK in AI

Hi, my printing house said I sent him a RGB file and he needs CMYK for printing.
(1) How can I know the original file is RBG color mode?
(2) How to convert RGB ai file to CMYK ai file?
Thanks a lot!!!

lhcheng,
1) File>Document Color Mode.
2) Tick CMYK instead of RGB.
You should be aware that the RGB and CMYK colours are fundamentally different, so most likely you will have to create at least some colours anew, and you will have to accept certain inevitable changes.
Many RGB colours will be changed to rather muddy and messy CMYK colours, as you can see in the Color palette when selecting CMYK.
And many bright colours will become less so.

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.

Converting RGB to CMYK without flattening

So I made a big mistake and designed something for a client in RGB format Theres only 2 layers out of 14 with colour so how do I go about changing the whole document to CMYK without flattening the document? Or are there any other alternatives?
Thanks

When you choose Image > Mode and check CMYK you will be presented with this optioin:
Having written that, I suggest you check with your client or client's lithographer. He may prefer to do the RGB-to-CMYK conversion himself so that it accommodates his print profile,

Which versions of photoshop can convert rgb to cmyk?

Hi all, I'm needing to convert high quality graphics from rgb to cmyk for publication and I'm trying to figure out which version of photoshop I should get for the job. I know that photoshop elements does not have the rgb to cmyk function, but am unsure otherwise. In particular, I'm looking at creative suite 5 as an option. Will that allow me to do this? Thanks for the help

You actually needed to have version 2.0 in order to have CMYK function. The year was 1991.

Having troubles converting RGB to CMYK

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