RGB vs. CMYK color formats

I have an HP6600 and want to print in RBG color formating, not sure if default might be CMYK ?? colors are not printing in the proper colorations in pdf files received using RBG formating designs. Can anyone advise?? Can this be viewed or changed in this printer?

Hi moll4,
Welcome to the HP Support Forums! I understand you would like to print in RBG color formating, but would like to know if the default is CMYK.
To get a better understanding, take a look here: Overview of Advanced Color Management
Support for ICC profiles is available in printer driver version 5.1 and later. ICC enables profile-based color management solutions. ColorSync and Windows ICM are specific implementations of ICC color management. For more general information on ICC color management, please see www.color.org.
I hope this helps!
Thanks,
HevnLgh
I work on behalf of HP
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to the left of the reply button to say “Thanks” for helping!

Similar Messages

How do I find out if a photo in iPhoto is RGB or CMYK color? How do I change from RGB to CMYK?

How do I find out if a photo in iPhoto is RGB or CMYK color? How do I change from RGB to CMYK?

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

Automatically convert from RGB to CMYK color mode

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.

RGB or CMYK colour formatting for iPhoto Albums printing.

Hi.
I'm putting my first iPhoto Album together. Info given from Apple about what colour format to use for your photos, says to use RGB. While this is corrcet for digital monitors and screens. Mass printing uses CMYK. Any images supplied to a printers in RGB will colour shift when printed in CMYK. No matter what a printer tells you, these colour shifts can be very noticable. I'm an Advertsing Art Director and I've seen the shift that happens.
I will be checking/colour correting all photos submitted to the iPhoto Album with Adobe Photoshop. And many will very probably undergo some corrections. Be it through levels, curves, hue/saturation, etc. Nothing to anything near an excessive level, but enough to make obvious improvements.
So I will then be faced with the choice of whether to save the images out in RGB or CMYK.
Can someone with some technique knowledge, from the iPhoto team, tell me/reasure me why RGB has been specified? And if CMYK wouldn't actually be a preferable colour format to supply in, considering you'll be printing them in CMYK.
Many Thanks, Jim.

You're absolutely correct. I was referring to notes make a number of years ago in regards to iPhoto 5 and that RGB was recommended for both books and prints.
I was confusing CMYK with Grayscale with Dot Gain 20% profile when stating iPhoto didn't support it which it didn't fully support until iPhoto 9.
In fact I just ran a test with iPhoto 6, 7 and 8 with a CMYK AND GrayScale files with the following results:
iPhoto 6 (06): wouldn't import CMYK but did GrayScale. The grayscale file would only display as a black thumbnail and negative full image. If the DotGain 20% profile was stipped from it the iamge would dispaly normally.
iPhoto 7 (08): wouldn't import CMYK but did GrayScale. The grayscale file would only display as a black thumbnail and negative full image. If the DotGain 20% profile was stipped from it the iamge would dispaly normally.
iPhoto 8 (09): neither file would import which is surprising:
iPhoto 9.2.3 (11): both imported and viewed normally.
iPhoto 9.4 (11): both imported and viewed normally.
In Oct, 2007 I got an email from Apple support with the following:
Also as iphoto makes a pdf of the book and then uploads it to keep the size down, it doesn't matter if the pics are RGB or CMYK as a pdf is a closed file. But since it is going through prinergy it has an RGB checker so this most be switched off. It is how the software in prinergy handle's it that causes the washed out affect as it takes the Red Green Blue colours and tries to convert to Cyan Magenta Yellow Black. Now the colour spectrum in printing between rgb and cmyk is quite different looking at a colour wheel will show you. The best way i can describe it is if you have a pantone book which has spot on one side and process on the other you can see a colour difference. Or if you use quark open up the colours and again switch between process and spot.
BUT ONLY CONVERT PICS TO CMYK IF YOU ONLY INTEND TO ORDER BOOKS. IF YOU INTEND TO ORDER PRINTS IT WILL NEED TO BE RGB.
Here's how i see it:
1. Apple doesn't want 2 different versions of the pics floating about as running CMYK through a photomachine (as prints you would order in the high street) will not print correctly.
2. RGb's going through a CMYK press using prinergy will attempt to convert and produce the washed out effect, or yellowing effect BUT will still print.
So it will use the 2nd option as it will still produce prints normally and books with a slightly washed out effect. Now to most people in the high street, who will notice a difference?
I have just received my latest book saved as CMYK pics in tiff format and no washed out effect. What i will say is The quality if still not as good as a print. Now we use a docucolour 5252 at work and the colour quality is better. I wonder how often the machine is calibrated and what colour curve it is set to?
However, I am unable to import a CMYK file in any iPhoto version until iPhoto 9. Go figure.
Thanks for the feedback. Hadn't addressed this particular subject in quite a long time.

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.

How to select matching RGB and CMYK colors

Starting from scratch for a client, how do I select matching RGB and CMYK pairs?
Say we find a nice red colour in RGB for screen use, how do I then find the correct CMYK for print? And what assumptions do I have to make when doing this, if any?
Would it be the same for the other way around (choose CMYK first for print and then find the RGB equivalent)
Is it more sensible to start with a Pantone colour and then find the RGB and CMYK equivalents for that?
Many thanks
RobbieG
(I'm working with Ai, Ps and Id CS6)

Yes. Better to start with Pantone reference books where you are viewing the color in a reflective environment. As already mentioned, color on the monitor can be deceptive. And, I think the others are basiclt saying that you should have everything calibrated and use color management policies in your apps. There is a way to find CMYK equivalents using Photoshop's color palette. Let's say you have an RGB Red as the foreground color in Photoshop. If you double click on the swatch you will get Photoshop's color palette which lists the RGB percentages, CMYK percentages, LAB percentages, and HEX web color for that Red. You can go further and select "Custom" and the Pasntone Spot color palette opens and gives you the closest Spot color value for that Red. This however, depends on your color settings. That's why I recommend you start with the Pantone swatch book and get the perecentages of CMYK from their formula guide which is set to industry standard color.

Choosing profiles for forced RGB to CMYK color conversion

When a mixed RGB/CMYK PDF is opened in Illustrator CS6, Illustrator forces a conversion to one color space or the other. See this screenshot: http://imgur.com/sK8iEdn
I assume this is a limitation of Illustrator and there's no way to keep both color spaces. Under that assumption, Is it possible to choose the profiles used for the conversion from RGB to CMYK? Can Illustrator be made to use the RGB and CMYK profiles defined in its Color Settings to make this conversion?

I did some experiments with Illustrator CS6 and the MacBeth RGB test chart and verified my results with Photoshop CS6. I discovered Illustrator is (mostly) doing what it should be doing, within a 1% error (probably rounding) on the output CMYK values. Here's a summary, in case anyone else needs this info:
Assuming the source file's elements are all untagged, when a mixed RGB/CMYK PDF is opened in Illustrator and CMYK mode is
chosen, Illustrator will use the profiles and rendering intent defined in
Color Settings to make the color conversions from RGB to CMYK. Thus, we
have control over the profiles used for this conversion.
If the RGB elements in the PDF file have embedded ICC profiles,
Illustrator will use the embedded ICC profile instead of the RGB profile
defined in Color Settings. This ONLY happens, however, if the PDF file
also includes the correct CMYK output intent profile.
If the PDF doesn't contain a CMYK output intent, Illustrator will fall
back on the Color Settings RGB profile for RGB->CMYK conversion. I believe it
would be more correct for Illustrator to use the embedded RGB profile and
the CMYK profile defined in Color Settings, but that's not how it seems to work.
If the PDF contains the incorrect CMYK output intent, Illustrator will
ignore the Color Settings and respect the embedded RGB and CMYK profiles
for the conversion, as might be expected.

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

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.

Need Info on RGB to CMYK

Hi,
I am new to Illustrator (CS5) and not fully comfortable with RGB vs CMYK. For instance, I created a logo for use on the web using Document Color Mode: RGB where my background color in RGB is 0, 0, 130. When I create a Print document using Document Color Mode: CMYK and copy the logo into the print document, it converts that background color to CMYK (C:100, M:98, Y:16 K:18) where the RGB is now (44, 45, 111).
Is there a way to get a closer match to the original RGB color 0, 0, 130? When the specifications for the print advertisement says images must be in CMYK, I hope I am accomplishing this by using the Print Document Color Mode of CMYK vs RGB? I feel somewhat ignorant on utilizing the RGB vs CMYK color modes and if anyone can give me a tip on what techniques they use to get a closer match of colors for RGB to CMYK or vice versa, I would love to hear it.
Thank you,
Keith

Keith,
First, be aware that you have posted to the Photoshop forum, not the Illustrator forum. The general concepts of color and color management are the same across the spectrum of digital imaging. However, its implementation is slightly different from application to application, so you may also want to post your question to the Illlustrator forum.
[EDIT: Brain fart on my part... This is the color management forum, NOT the Photoshop forum, so you are in the right place! (I spend most of my time in the Photoshop forum; I lost track of where I was...)]
That said, you're running up against a general concept: color gamut.
The color you've spec'd in your RGB file (0/0/130 - and we'll assume for now that it's in the sRGB color space) is outside the gamut of every CMYK color space. That means that the RGB color you see can not be reproduced using a mix of the four CMYK process colors (cyan, magenta, yellow, black). When converting to CMYK, the software picks the closest color that is within the gamut of the CMYK space, hence the color shift.
When you're designing for CMYK, it's best to work in soft-proof mode which allows you to see a pretty close approximation of what your colors will look like in the final color output space - in your case, CMYK.
In Photoshop, to turn on soft-proof, go to View > Proof Setup> Custom... and choose the CMYK output space that matches the press conditions you are designing for.
There are books written about this, but hopefully this short answer points you in the right direction.
Message was edited by: Rick McCleary

Designing art for both RGB and CMYK

I need to make some artwork that might be viewed in both RGB and printed with CMYK. I know I can switch the color mode after making the artwork, however, I'm concerned with color shifting when changing from RGB to CMYK or the other way around. How do you design something that you can both print and display on screen without compromising the colors?
Thanks.

Generally, is there much if any color shift when going from CMYK to RGB?
Even if a given color is within the gamuts of both CMYK and RGB color spaces, that does not necessarily mean that color shifts will not occur.
You can't think of the RGB and CMYK versions of "a color" as "equivalents." There is not just one set of CMYK values for a given set of RGB values. A simple way to think about it is this: Take the product of three numbers. Now divide that number into four factors. Obviously, there is more than just one set of four values possible.
So switching back and forth between RGB and CMYK color spaces in willy-nilly fashon is not good practice. The software has to make a translation decision out of many possibilities. It does it according to your so-called "color management" settings. Even then, the software does not keep a breadcrumb trail of all of your switches back and forth. So colors can still drift.
Design for print first. Then repurpose for web. Color is not the only reason for this.
JET

'Convert CMYK Colors to RGB' still runs havoc in 9! (Plus a PDF version problem)

This post is to warn people about severe issues, and how to avoid them. Issues with the CMYK color setting in FM9.x have been reported here earlier, such as:
http://forums.adobe.com/message/1237696#1237696
http://forums.adobe.com/message/1237852#1237852
http://forums.adobe.com/message/1237165#1237165
However, I do not think this issue has been warned about anywhere near as much as it should have. And, as usual, Adobe is silent (they should have a big poster on their site warning about this issue! And they have even claimed that patches have "solved" the issues with CMYK).
Just recently, while experimenting with FM9 again, I had extreme problems, which, at first, seemed totally unrelated to this CMYK setting. But after having struggled extremely hard for many many many hours, I finally found out. Now is the time to inform others:
First a note about versions: FrameMaker 9.0p237, Acrobat Distiller 9.1, XP SP2
It looks perfectly okay on screen in FrameMaker, exactly as in FM8. But when saved as pdf, several things are "corrupted". Examples: no kerning after the letter 'T', such as the word 'Text'. Dotted leader for a right aligned tab disappears. Some objects from the master pages, such as a logo, become enclosed in a rectangle (a border of the frame/object), but it only happens on *some* body pages, whereas other body pages using the same master page are ok!!? Equations are formatted differently from the way they should, with the wrong font for number, etcetera.
Solutions:
1. When 'Save as PDF...', untick 'Convert CMYK Colors to RGB' in PDF Setup. Same setting is in the file's 'Format > Document > PDF Setup...'
A drawback with this method is that, as of Acrobat Distiller v9, it does not seem to respect the pdf version specified in the PDF job Options! I get PDF 1.6 with this method, despite my job option specifies version 1.5. (This happens also with FrameMaker 8 if Acrobat is v9.) So you *have* to optimize it in Acrobat in order to get a web friendly PDF (PDF 1.4 or 1.5).
or
2. Print to 'Adobe PDF'.
In this latter case, you can set the same 'PDF Setup' settings under the button 'Setup...', EXCEPT that there is no tick box for 'Convert CMYK Colors to RGB', and it does not matter what setting you have chosen in the file's 'Format > Document > PDF Setup...', it will be RGB conversion in any case. Make sure that after you exit the setting, the tick box for 'Print to File' is NOT ticked! This method respects the pdf version specified in the PDF job Options! I get PDF 1.5, which is what my job option specifies.
(For some reason, Acrobat/Reader does not render these two PDFs exactly the same, except in extreme magnification! Maybe it has to do with the different PDF versions of the files.)
In either case, the solution actually solves ALL problems I listed! Despite it seems to have absolutely nothing whatsoever to do with colors! Some day in the distant future, CMYK might actually work! But, for myself, I would prefer a proper color management instead...
Best Regards,
/Harald

Oops!! Not until now I discover that under 'Solutions' I happened to write 'untick' where it should be 'tick'! I.e, colors SHOULD be converted to RGB in order to circumvent the problems! I.e it runs havoc in v9 when CMYK colors are NOT converted to RGB! Don't know how I came to write the opposite, but probably I started out by describing the situation where the problems are seen rather than describing how to avoid them.
Equally strange is that nobody corrected me, but perhaps the mistake was so obvious? (But whether you see problems or not might depend on what fonts you use. So, under certain special circumstances, CMYK might actually work without these reported problems.)
I am also a bit surprised that others haven't reported the issue that the PDF version set in PDF job Options isn't respected when using 'Save As PDF' and Acrobat 9? (Or maybe someone has, but I have missed it.)

Export PNG in CMYK vs. RGB. Changing colors.

Short version: Using Illustrator CC. I correctly exported a PNG logo in RGB (sent to client), but the new PNG logo looks much different than the old PNG logo that was exported incorrectly in CMYK (sent to client long ago).
Client wants to know why the NEW PNG logo looks so different than the EPS logo and the OLD PNG logo (all starting with the same Pantone color).
Longer version:
I recently sent logos to my client in different formats.
ai, eps, eps CMYK, pdf, and png
Prior to creating the PNG version in Illustrator CC,
I changed Illustrator's color mode to RGB, then converted my Pantone colors to RGB (specific values per the Pantone book), then exported as PNG.
This created a much different blue than the CMYK eps version.
Someone else on the client side is working with my files and questioning why the blues look so different. The Pantone eps vs. the RGB version.
Problem:
In the past, the PNGs had been created incorrectly--They had been exported in CMYK mode without converting anything to RGB and they matched much closer to the EPS version.
Now they are asking why there is such a big difference.
I did the process correctly, I'm not sure how to answer this. Why do they look so different?

So if I just leave the Document Color Mode as CMYK, leaving with the logo set in it's specific Pantone colors, and then Export/PNG, that will covert my CMYK colors to RGB for me. Seems almost too easy. Just go File/Export/PNG, but okay.
And while that may give me a better perceptual match, here's the other side of the issue.
They've given me and their web company specific RGB values for their logo. These are based on the Pantone book, and likely different than the conversion Illustrator will do.
The idea being, they want the website and logo to be the exact same blue. And they are based on the values they gave, but they look different than the original Pantone. Brighter and more vibrant. I'm dealing with another member of the client team, trying to use Illustrator on her end for smaller tasks, and she wants to know why the rgb PNG logo (which I entered in manual values for based on the Pantone book), is so different than the Pantone eps file. In the past, when I just exported as a straight PNG without tinkering, the perceptual match was there. Now it isn't. How can I explain this?

Converting to CMYK color profile (for print) in raw format

I am looking to self publish a cookbook in lightningsource. They need the photos in cmyk format. When is it best to convert to this color profile from rgb?
I have bridge CS5
What I'm doing currently:
I click on my .arw image file and select "open in camera raw" which brings me to an editing screen. At the very bottom is says rgb, and 240 ppi
I need 300 ppi at least and cmyk color.
Now I know how to change these things in Photoshop, but I was taught that editing it in camera raw in bridge is better to preserve quality for print.
Should I just edit it in raw and then convert to 300 dpi and cmyk color in photoshop? Or is there a way to do this in bridge? Whats the difference? Any advice will help, trying to make my pictures look amazing in print

Correct me if I misunderstood anything!
You are on the right track except for the ppi story. The ppi settings just are a figure expressing the amount of pixels stored in 1 inch, without the width and height figures of the image itself you can't do much with it and just changing this figure is not changing the total amount of available pixels.
For instance create a new document at 300 ppi and use the international paper size A4 (21 x 29,7 cm). The amount of pixels is 2480 x 3508 (roughly the result of an 8 MP dSLR.
Use the image size option in PS and be sure to not resample (meaning creating new pixels or deleting pixels to alter the original file size that is 24,9 MB). Now change the amount of pixels to whatever you like. If you increase the number the width and height decrease, and vice versa. Yet the amount of pixels and file size stay at 2480 x 3508 and 24,9 MB.
But with the specs of wanted width and height for the end result of 300 ppi starts making sense.
For instance you have a image at the size of a post stamp and an image at international paper size (A4) and both are 300 ppi. The small post stamp size would be in cm about 2 x 3,5 while the A4 size has about 21 x 30 cm width and height.
So you can imagine having both needed to be printed at the A4 size in 300 dpi (printers work with dots, hence they use dpi - dots per inch- and while not the same they both often use the 300 figure and stand for pretty high quality result) the A4 sized original will meet the wanted standards without problems while the post stamp would have to be resampled to the new A4 size and when having still 300 ppi needed there would be a lot of interpolation (creating new pixels to match the new size) and this would often result in pixelated or worse quality print result, because PS has to use guess (albeit quit educated guessing) work to add more pixels that are needed to reach the new dimensions.
ACR has the advantage to set the ppi by default at 300 but as said, as long as you don't alter width and height of the original it is just a figure without any significant importance until you know the complete specs for the output source.

How to Get RGB Values from a CMYK Color in the DOM (CS5)

(CS5, Actionscript)
Hi all,
I have an InDesign document containing TextFrames whose border colors are specified as a CMYK array.
I would like to be able to get its color specification as its closest RGB equivalent.
Does the InDesign DOM contain a method for doing this for me automatically? If not, what workarounds are there?
TIA,
mlavie

Here's how to convert RGB to CMYK:
function rgb2CMYK (r,g,b){
    var color = app.documents[0].colors.add({space:ColorSpace.RGB,colorValue:[r,g,b]});
    color.space = ColorSpace.CMYK;
    var retVal = color.colorValue;
    color.remove();
    return retVal;
The same idea for the reverse.
For info on converting to grayscale, check out this:
http://in-tools.com/article/scripts-blog/convert-colors-to-grayscal-in-indesign/
HTH,
Harbs

RGB vs. CMYK color formats

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