Converting swatches from RGB to TCX

Is there an easy way to convery the RGB colors downloaded
from Kuler into TCX swatches?

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...

Similar Messages

How can I convert Pdf from RGB to CMYK, keeping font color 100% K while working in Illustrator?

How can I convert Pdf from RGB to CMYK, keeping font color 100% K while working in Illustrator?
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).
The original source of the document is a Microsoft Word file, I have converted the Word file to Pdf in order to setup for OFfset Printing.
Thanks

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

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...

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

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!

Ugh, I'm a newb and did a better search and found other previous posters asking the same question.
Feel free to close this thread (if you do such things here).

How can i convert my file from RGB to CMYK?

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?
Peter

Converting from RGB colorSpace to cs_gray

Pls can anybody help with the conversion from sRGB to cs_GRAY
i have been trying to convert but the registry says the samplemodel is not compactible the colormodel

I am replying to this topic again in the hope someone will be able to help with step 2 of the subject question. In one of the replies, Michael offered a VI utilizing nested loops to convert the 32 bit array containing RGB values to Cielab Lab values. Because of the extensive computations required for digital images of significant pixels, the cited nested loop approach requires to much computation time (i.e., approximately 30 seconds) when a steady stream of images need to be processed. I believe there exists another Labview approach that will allow the conversion of all the pixels' from RGB coordinate color space to Lab coordinates allowing histrographs to be plotted for the respective L, a, and b distributions. I would appreciate help from an NI engineer or anyone who is familiar with a more efficient colorspace conversion approach for all pixels of a digital image.

How to convert CMYK to RGB programmatically.

Hi,
I have a CMYK colorspace in indesign, i want to convert that as RGB color space, I got some codes, but I am getting incorrect data.
Some of the codes which I tried are given below
        double cyan = 35.0;
        double magenta = 29.0;
        double yellow = 0.0;
        double black = 16.0;
        cyan = Math.min(255, cyan + black); //black is from K
        magenta = Math.min(255, magenta + black);
        yellow = Math.min(255, yellow + black);
        l_res[0] = 255 - cyan;
        l_res[1] = 255 - magenta;
        l_res[2] = 255 - yellow;
@Override
    public float[] toRGB(float[] p_colorvalue) {
        float[] l_res = {0,0,0};
        if (p_colorvalue.length >= 4)
            float l_black = (float)1.0 - p_colorvalue[3];
            l_res[0] = l_black * ((float)1.0 - p_colorvalue[0]);
            l_res[1] = l_black * ((float)1.0 - p_colorvalue[1]);
            l_res[2] = l_black * ((float)1.0 - p_colorvalue[2]);
        return (l_res);
The values are C=35, M = 29, Y = 0, K = 16 in CMYK color space and the correct RGB values are R = 142, G = 148, B = 186.
In adobe indesign, using swatches we can change the mode to CMYK or to RGB.
But I want to do that programmatically, Can I get any algorithm to convert CMYK to RGB which will give the correct RGB values.
And one more question, if the alpha value for RGB is 1 then what will be the alpha value for CMYK?
Can anyone help me to solve these issues... Thanks in advance.

All you have to do is loop thru the swatches and change the space to RGB. Below is an AppleScript, but it shouldn't be too difficult to come up with the equivalent JavaScript. Your document's assigned RGB space will determine what RGB space the CMYK converts to, so if you are looking for sRGB, then Edit>Assign Profiles...>Assign Profile: sRGB
tell application "Adobe InDesign CS3"
tell document 1
repeat with a from 1 to count of every swatch
try
set space of color a to RGB
end try
end repeat
display dialog "All swatches have been converted to RGB color"
end tell
end tell

How to keep color when switching from RGB to Indexed Color Mode?

I'm working in Photoshop CS6
In Photoshop I've designed a custom crop screen for use in Magic Lantern (a program that runs with Canon cameras) The project is in 8bit RGB and to be able to use it (in Magic Lantern) I have to change it to Indexed Color (using a an .act file provided fom them) Then I have to save it as a .bmp. When I chnage from RGB to Indexed color (loading the .act file) the color in my Photoshop project turns to grey.
I haven't worked with Indexed colors or changing the color mode etc.
My question is... how can I keep the color (or a color similar, compatible color) to what I created in RGB when I convert it to Indexed Color using the .act file?
Any suggestions?
Thanks

Attached are 4 jpgs:
- The Crop Screen as it appears in the PSD file (RGB color/8-bit)
- The Index Color .act file that I'm loading
- The settings after I have loaded the act file
- the Crop Screen with the blue color missing

How to convert YUV to RGB

I need to convert the YUV values to RGB. What is the formulae to convert? YUV values in the ratio 4:2:2. First I read it from a YUV file,then
convert it to RGB. Then make an image(JPEG) from this values. How can I do this?

http://www.fourcc.org/fccyvrgb.php
First result in google...Like I said, no initiative what so ever!
The OP is a goldmine of post like these, I forsee that he's about to start a major project that he's incapable of and get the forum to complete it for him

Is it necessary to convert photos from RBG to CMYK if you are just printing at home?

I am new to the creative suite, and I am using InDesign for a class presentation. I was told I should convert any photoshop images that I use from RGB to CMYK for printing, but I am just printing it at home on my little deskjet.
Second question: If it IS necessary, why do I get a alert in photoshop saying "You are about to convert to CMYK using 'U.S. Web Coated (SWOP) v2' profile. This may not ve what you intend." What does this mean and should I just ignore it?
Thanks in advance for any advice you may have!

The advice you got was specifically for sending a project to a CMYK printing press. Converting to CMYK has been the traditional requirement for those jobs, from the era when most images were printed and most printed images went to a CMYK press.
But it's been many years since that was true. Some InDesign workflows can use RGB images if you set up InDesign to do the conversion to CMYK at output, or if the digital press will be doing the conversion. A lot of digital home printers and newer digital printing presses are set up to work with RGB images. For example, you don't send CMYK images to the lab to have printed enlargements and photo books made, you send RGB. As far as your home inkjet goes, it uses different ink colors than U.S. Web Coated (SWOP) CMYK (some printers use six inks or more), so converting to CMYK wouldn't even match up properly with the inks being used.
That's the reason you see the alert message. It's no longer a world where you convert all images to CMYK to print, so Photoshop is making sure it's something you actually need to do. Because if you convert to CMYK when you don't need to, your images will look worse because CMYK doesn't provide as many colors as RGB.

Converting sRGB to RGB in Batch

Good morning from Germany!
Has anybody an idea, how to convert sRGB to Adobe RGB in Batchmode?
I have to convert 2000 pics, would be a little bit too much work.
I have elements 7.
Greetings
Frank

But you never loose Information, when you convert from something to Adobe RGB. When you convert it, the information will be the same.
If that were true, then if you converted an sRGB image to an Adobe RGB image, you would end up with the exact same image. And if you then converted that image back to sRGB, you'd still have the same exact image. But you can easily show that this isn't the case, with the following experiment:
1. Start with a typical sRGB image:
http://www.pixentral.com/show.php?picture=1TpSRYzXPRQWcz8x1Dr9pnGJCi88yZ0
2. Convert the image to Adobe RGB using Image > Convert Color Profile.
3. Convert the image back to sRGB.
4. Combine the original image from step 1 and the doubly converted image from step 3 as layers in a new image, with blending mode of Difference.
If the original and converted images were identical, the difference in step 4 would be all black. But in fact, if you invoke the Levels command, you can see that many of the pixels are not quite black. If you shift the Levels white point to the left, that will highlight the differences, as seen in this screen shot:
http://www.pixentral.com/show.php?picture=1uEu9m1OjVgb2JSvx6dQ6pkHvSnWv0
If you think about this mathematically, in JPEGs both color spaces use 8 bits per pixel for each of R, G, and B. Thus, each color space has exactly the same number of distinct colors (different values for R, G, and B), 16.7 million. The Adobe RGB colors are spread out over a wider gamut than sRGB, but sRGB has more, finer shades of colors within its narrower gamut. Since both spaces have the same number of colors, and since Adobe RGB has colors that sRGB does not, then it must necessarily be true that sRGB has some colors that Adobe RGB does not. Thus, if you convert an sRGB image to Adobe RGB, some colors will be changed to their nearest Adobe RGB colors, which aren't exactly the same.

Need to convert Date from calendar to String in the format dd-mom-yyyy

Need to convert Date from calendar to String in the format dd-mom-yyyy+..
This is absolutely necessary... any help plz..
Rgds
Arwinder

Look up the SimpleDateFormat class: http://java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html
Arwinder wrote:
This is absolutely necessary... any help plz..For you maybe, not others. Please refrain from trying to urge others to answer your queries. They'll do it at their own pace ( if at all ).
People on the forum help others voluntarily, it's not their job.
Help them help you.
Learn how to ask questions first: http://faq.javaranch.com/java/HowToAskQuestionsOnJavaRanch
(Yes I know it's on JavaRanch but I think it applies everywhere)
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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

Converting swatches from RGB to TCX

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