CMYK to RGB conversion in photoshop

Hi,
I have synchronized my colour settings in bridge to be the same across all my Adobe software, it's currently on Europe Prepress 3 because that's what I've been taught is correct in Australia. I have a colour swatch of C:0 M:90 Y:15 K:0 and when I change the colour slider to RGB in photoshop is gives me the values: R:200 G:53 B:122 (not sure if this is a good way of converting the colours?)
My initial swatch:
When I key this exact RGB value online it gives me a much darker swatch:
So using multiple cmyk to rgb online converters (to compare) I key in my initial cmyk values and the rgb swatch it converts to is so much brighter and gives me the values R: 255 G:25 B:217
I know I'm doing something wrong. I hope someone can help me with this!
Thanks in advance!

This is about 1) different color spaces which will have different numbers for the same color, and 2) gamut limitations going from one space to another (some color spaces are bigger than others and can contain more saturated colors).
"Europe Prepress 3" is just a preset. It sets Adobe RGB as working RGB, and FOGRA39 as working CMYK. When you go online, however, you'll most likely get numbers corresponding to sRGB and US Web Coated (SWOP) v2, because these are the Photoshop defaults (but have no particular significance beyond that). IOW there are no such things as "RGB" and "CMYK" - only specific RGB color spaces and specific CMYK color spaces.
In different color spaces, such as sRGB vs. Adobe RGB, the same color is represented by different values. That's why you have to convert from one to the other.

Similar Messages

CMYK to RGB conversion without 3rd party software?

Does anyone know a way to use Automator to convert CMYK color mode images to RGB without having to have Photoshop or such installed? All Automator add ons I have seen thus far involve either Adobe products or other 3rd party image programs.
Thanks!

Hello again Ric,
Thanks for your help. I would appreciate a bit of Applescript help. I have Automator back in the mix after playing around a bit.
Yes, my associate who owns the website has neither PS, or GC. So if we can set up a way to automate this via email that would be great. I think I am actually about half way there, and I hope you will be kind enough to help me get the rest of the way.
My machine is no longer the spunkiest, so I am using GC to do the color mode conversion, as it can launch, convert, and save the file in less than 1/4 the time Photoshop takes to launch. So yes, I'm doing this in a crazy fashion, but I have good reasons.
This is my script thus far:
using terms from application "Mail"
on perform mail action with messages theMessages for rule theRule
tell application "Mail"
set numberOfMessages to count theMessages
repeat with eachMessage in theMessages
set theSubject to subject of eachMessage
try
set nameOfAttachment to the name of the first mail attachment of eachMessage
(*if nameOfAttachment ends with ".torrent" then*)
set filename to "Macintosh HD:Users:parr:Desktop:Alpha Images:•From Brett:" & nameOfAttachment
save first mail attachment of eachMessage in filename
tell application "GraphicConverter"
activate
open {alias filename}
save window 1
close window 1
quit
end tell
tell application "Automator"
execute "Alpha Convert"
end tell
end try
end repeat
end tell
end perform mail action with messages
end using terms from
This works up until I call my Automator workflow. In my workflow I currently have the scale item and the convert to jpeg item.
Question 1: How do we tell Automator what files to use as an input? Do I have to add a Get Selected or Get Specified Finder Items? Can I use the 'filename' variable from the above script?
Once I have that down, any advice you can give on emailing it back would be great.
Thanks again.
QS2002 933 - Soon to be Macbook 2.0 Mac OS X (10.4)

PDF reduce file size filters and CMYK to RGB conversion

This doesn't seem to be on-topic to this forum, but I'm hoping someone here has the expertise to answer my question. We have some scripts which take a series of press-quality pdfs and use the "reduce file size" filter to prepare them for viewing on the web. We run these scripts on a 10.4 machine, and the filter works very well, reliably reducing file sizes of all sorts of pages.
When we tried to upgrade the machine, we discovered that the quartz filtering has changed in 10.5 and 10.6. While it's usually an improvement, getting maybe 5-10% better compression ratios, it has become unreliable in that about 5% of my files fail spectacularly -- they blow up to 3, 4, 5, 6 times the original size.
The other thing that happens is that the 10.5/10.6 filters munge the colors up. I found the solution to this -- in the ColorSynchUtility, make a duplicate of the Reduce File Size filter, and add a Color Management Component called Convert To Profile. This allows me to set a filter that converts the CMYK content to RGB. The problem is that there are about 40 choices of profiles, and it's not at all clear what I should use. Many of them have printer manufacturer's names in them, some say "Adobe", others have cryptic codes (probably referring to various RFCs and schemes). I've tried a couple of the ones that don't look like they are for printers, basically chosen at random. They all produce files of slightly different sizes for the reductions that go well, but on the files that blow up, some filters are better than others. (For example, I have a 5MB page which reduces to 1.4MB with the 10.4 filter, but blows up to 27MB with the "sRGB IE61966-2.1" profile, but only 12MB with the "Adobe RGB" profile.)
So I have 2 questions:
1) Is there any way to configure a 10.5/10.6 custom profile so that it behaves as reliably as the 10.4 "stock" PDF Reduce File Size works? It doesn't have to be the most wonderful compression algorithm out there, just so that it never or rarely has a file blow up in size.
2) For converting press documents to pdfs that are going to go on the web, what is a good "Convert to profile" to use of the 40-some choices on the pull-down menu?

Cathy,
You have posted your question in a forum dedicated to the Final Cut Studio application Color. It is a very specialized program to grade (adjust) the color in video/film images. We know nothing regarding PDFs.
Have you tried posting this on an Adobe support site?
Good luck,
x

CMYK to RGB conversion with icc profile. Output is too dark

Similar question has been asked many times. But I didn't found the answer.
It looks like this code cmykToRgb.filter(r, resultRaster) doesn't convert anything.
But I presume each pixel from the raster "r" should be converted to RGB colorSpace and put into the resultRaster. Am I right?
Any help appreciated.
That profile file got from adobe site.
see
[before image|http://i.stack.imgur.com/HHGes.png]
[after image|http://i.stack.imgur.com/4erZj.png]
Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("jpeg");
ImageReader reader = null;
while (readers.hasNext()){
      reader = readers.next();
      if (reader.canReadRaster()){
          break;
// read
ImageInputStream ios = ImageIO.createImageInputStream(new FileInputStream(new File(myPic.jpg)));
reader.setInput(ios);
Raster r = reader.readRaster(0, null);
BufferedImage result = new BufferedImage(r.getWidth(), r.getHeight(), bufferedImage.TYPE_INT_RGB);
WritableRaster resultRaster = result.getRaster();
ICC_Profile iccProfile = ICC_Profile.getInstance(new File("profile_name.icc");
ColorSpace cs = new ICC_ColorSpace(iccProfile);
ColorConvertOp cmykToRgb = new ColorConvertOp(cs, result.getColorModel().getColorSpace(), null);
cmykToRgb.filter(r, resultRaster);
// write
ImageIo.write(resul, "jpg", new File("myPic.jpg"));Thanks
Edited by: n0d on Nov 15, 2011 4:59 AM

From the javax_imageio_jpeg_image_1.0 specification:
If an Adobe APP14 marker segment is present, the colorspace is determined by consulting the transform flag. The transform flag takes one of three values:
2 - The image is encoded as YCCK (implicitly converted from CMYK on encoding).
1 - The image is encoded as YCbCr (implicitly converted from RGB on encoding).
0 - Unknown. 3-channel images are assumed to be RGB, 4-channel images are assumed to be CMYK.What it's talking about is the metadata returned from ImageReader#getImageMetadata. For jpeg's, it has the following structure.
javax_imageio_jpeg_imageio_1.0
     JPEGVariety
          app0JFIF
               app2ICC (if present, user object is ICC_Profile)
     markerSequence
          app14Adobe
               transform Value (0, 1, or 2)Basically if the transform value is 2 then it's YCCK->CMYK->RGB. If the transform value is 1, then it's YCC->RGB. If the transform value is 0, then it's CMYK->RGB if the raster has 4 bands, otherwise it's already in RGB if it has 3 bands.
The problem is that the default JPEGImageReader that comes with installing java is buggy. It usually throws an exception if you try to read the metadata of a cmyk jpeg. So the bad news is that you're sort of out of luck on that front.
The good news is that Sun did create a jpeg reader that can read any jpeg, including a cmyk one. It's called the CLibJPEGImageReader and you get it with installing JAI-ImageIO - http://download.java.net/media/jai-imageio/builds/release/1.1/ . It's a 'natively' accelerated ImageReader that doesn't have all the bells and whisles of your standard ImageReader. It can't read rasters, the writer can't write custom metadata, but it's fast and can read essentially all jpegs.

Why do Adobe Color CC and Indesign CC not convert CMYK to RGB the same?

I recently used Adobe Color CC to create a color theme that will be used for both print and web. I created the theme with approved CMYK values with the intent of saving the .ASE file to be imported into other CC apps. Corresponding RGB, Hex, Lab and HSB values are automatically created. Of course, we are using CMYK for print and RGB for web
A coworker had separately created the same exact CMYK theme in InDesign CC, and created RGB values from the same exact CMYK values I had used in Adobe Color.
The InDesign RGB values are quite different from the Adobe Color values.
Anyone know why the values are not the same, and moreover, which CMYK to RGB conversion values may be relied upon for accuracy?
EDIT: I guess the real question should be, What are the color management settings built-in to Adobe Color CC, and can they be duplicated in desktop Adobe CC applications?
Thanks very much

I found what change it to normal way, but logicaly it's should not be a reason for autoconvert colors. If I choose CMYK and want add CMYK color it should be CMYK (in name minimum) and not RGB.
File->Documents Colors->CMYK(should be, but RGB was)
Right now options open like CMYK, not HSB. But if I want color in RGB it added like CMYK. Options like in CMYK, not HSB, again. Still look like error.

Why don't Adobe Color CC and InDesign CC convert CMYK to RGB the same?

I recently used Adobe Color CC to create a color theme that will be used for both print and web. I created the theme with approved CMYK values with the intent of saving the .ASE file to be imported into other CC apps. Corresponding RGB, Hex, Lab and HSB values are automatically created. Of course, we are using CMYK for print and RGB for web
A coworker had separately created the same exact CMYK theme in InDesign CC, and created RGB values from the same exact CMYK values I had used in Adobe Color.
The InDesign RGB values are quite different from the Adobe Color values.
Anyone know why the values are not the same, and moreover, which CMYK to RGB conversion values may be relied upon for accuracy?
Thanks very much

It's working for me (Web, PS, AE, ID, FL; not available in the Color Themes panel in Ai). Please click the triangle next to the color space to expand and view more data.

Why do the relative values of RGB and CMYK change when switching between Photoshop and InDesign?

I'm trying to put together a Colour Guide for my company's brand guidelines.
I initially worked from InDesign and wrote down all the H, RGB, and CMYK values that I got when I eye-dropped my original colour palette.
However when I put the same RGB values into Photoshop- I am given a (slightly) different set of CMYK numbers from those that I had originally documented in InDesign.
Why is this???

Jamie,
in Photoshop go to Edit > Color Settings and choose your parameters:
For RGB: sRGB or AdobeRGB (1998)
For CMYK: the process as recommended by your printer (person, company)
For offset printing this is here ISOCoated-v2-eci and elsewhere for instance SWOP.
For digital printing you should ask the company as well.
For Grayscale: Gray Gamma 2.2
For Spot: probably irrelevant in the moment. Dot Gain 20%
Everything as shown here:
For your application I've modified my settings a little, therefore we can see top left 'unsynchronized'.
In InDesign do practically the same, but there are no settings for Grayscale.
You'll find for any topic explanations if you move to by mouse (position the pointer over ...).
The field 'Settings' shows not 'Custom' but the file name of a configuration which had been previously saved
and then loaded (buttons top right).
Further explanations on request. It would be quite useless to explain everything now at the same time.
The colors will be wrong if the settings are not synchronized. Above they are explicitly synchronized.
Because Bridge was not used, the system considers them as 'not synchronized', which doesn't matter.
Best regards --Gernot Hoffmann

Can a photoshop cmyk psd file converted to photoshop PDF be used online, or 1st convert to RGB?

Can a photoshop cmyk psd file converted to photoshop PDF be used online, or 1st convert to RGB? (the client requested 300 res. and is using it for their online magazine)

There should be no difficulty using CMYK online - all PDF viewers have to be able to convert to RGB for the screen. But I'd be very concerned about putting 300 dpi online. You should shrink it down to a suitable screen resolution.

CMYK to RGB to CMYK again...why?

I'll be the first to admit - I am relatively new and inexperienced when it comes to color management.
I am a prepress tech - 6 years now or so. Been in printing for 24 years - was a conventional stripper before that.
Not a complete dummy but I was never exposed to the old ways of electronic prepress -
My question is a "why?"
We have a PDF based workflow running Trueflow.
Because we have an older version of Trueflow that requires specific settings in order to accept PDF files, I have a certain criteria that supplied PDFs must meet.
I don't always get them that way - so I have a preflight routine where I open all PDFs and check them for spots/RGB/Lab color swatches, etc and convert as needed to CMYK. I then flatten them in PitStop extreme and run them through my rip.
We do not have the ability to proof with ripped PDF files - therefore, when a PDF proof is required, I want it to be the print file that will be used to output to plates.
OK - now you have a little background about my methods -
Here is the question.
My client was supplied a CMYK vector PDF ad.
Artist for the client opened ad in photoshop, rasterized it and converted it to RGB, placed it in his Quark document and sent the 16 page PDF file to me
I received it, noted that the file was full of spots and RGB and did a conversion back to CMYK in pitstop
We sent a PDF proof to the client, who approved it (for the record, when we PDF proof, we assume that color is not critical otherwise the client would have asked for a matchprint)
OK - so we print the booklet and client is very unhappy with the color on the back page.
Artist says that we should have let the rip convert the RGB file to CMYK instead of doing it myself - like I trust my rip to do what it should - I don't - it has made a mess of things in the past. I know what condition my files have to be in before they go in the oven. I don't take chances.
My question is, why would he convert it to RGB in the first place? I am completely lost on this one. If I am supplied a CMYK file, what reason is there for converting it to RGB before placing it into the document?
Can anyone explain why this would be necessary?
Thanks in advance!!!! I'm sure there are some gurus out there who can make sense of it in explaining it to me.

From what you describe in the original post, I get the feeling that the wrong question is being asked. In the particular case, there was probably no need at all to convert (or maybe even rasterize) the PDF you supplied. If the client's artist only needed to make minor changes to an existing layout, he or she would obviously have been better off applying those changes to the original layout document (InDesign, QuarkXPress) to conserve editable vector data and the source colours of any pixel images. Only if the original layout document was not available or had been modified colour-wise at a later production stage would I have used a PDF as the basis for editing the ad. Maybe the artist inadvertently made the RGB conversion when rasterizing the PDF? As you supplied the PDF and your company ultimately did the printing as well, I see no reason why the data would have to be converted to RGB and back to CMYK; the artist could have easily left everything as is and just added the modifications. What flavour of PDF did you supply? For your CMYK safe workflow, I guess PDF/X-1a would have been the most appropriate one*. Then the artist could work in the device space as you do or convert any new RGB content to the CMYK space as specified in the PDF/X output intent. I would recommend to communicate who does what before the layout work rather than after printing and running across unpleasant surprises. Redundantly converting colours back and forth without a clear and strict process and colour management is a very bad idea in my opinion, and as you saw, it can yield quite unsatisfactory results. It does take more effort to set things up properly, but in the end it tends to cost less and deliver (far) better results than troubleshooting and re-printing a screwed-up mess.
* If your Trueflow system requires different, non-standard PDF settings, then things get more complicated. Your company's management may want to consider whether the equipment on hand is really up to the tasks it is supposed to perform ...

I can convert almost things multiple times at the same time including CMYK to RGB (or sRGB), but not RGB to CMYK and not brighten/contrast. How?

I can convert almost things multiple times at the same time including CMYK to RGB (or sRGB), but not RGB to CMYK and not brighten/contrast. How?

If you want a relevant answer you may have to elaborate on what you actually mean. Posting screenshots might help, too.
In any case multiple conversions of an image are not advisable in general.

Cannot completely convert PDF from CMYK to RGB

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

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

Coverting PMS Colors to CMYK or RGB

HI there, I have been given some PSM colors to use for a
website but cant find how to convert them to CMYK or RGB. Does
anyone know anything about PMS colors and how I would go about
converting?
1. Example: PMS 8520 Metallic Light Brown
Cheers
Mally

quote:
Originally posted by:
MalRom
HI there, I have been given some PSM colors to use for a
website but cant find how to convert them to CMYK or RGB. Does
anyone know anything about PMS colors and how I would go about
converting?
1. Example: PMS 8520 Metallic Light Brown
Cheers
Mally
Years ago, Pantone made a product called ColorWeb Pro that
had software and also a fan of ink samples and Pantone's
recommendations for CMYK and RGB (Web) values that would be the
best representation for each ink. For the Web, they'd researched
the ink colors and tried to account for variations in graphics
card, monitor, and printer hardware. Because of that variation,
there's really no hard and fast conversion you can use. (Plus, the
RGB colors that are best for the Web won't be the same as the CMYK
colors that are best for print.)
Pantone has a number of current products for color matching.
You might be better off contacting them and getting advice on what
product would work best for you.
Pantone Web site
For a metallic color, you might want to use a subtle gradient
to simulate a reflective effect, though.
Good luck!

CMYK and RGB with a laser printer

I'm using ID CS2 and a Konica Minolta bizhub C353P printer.
I was supplied with a pdf artwork file by a customer. I believe it's CMYK, but am not sure, as Document Properties in Acrobat doesn't give that information. Firstly, is there a simple way of checking whether a pdf file is CMYK or RGB?
I placed the pdf artwork into ID and printed the indd file, but found that the colours were not quite correct. So I imported the original pdf file into Photoshop and changed it from CMYK to RGB. I then saved it as a tiff file and placed it back in the indd file. The colours now printed correctly. Next question - is there a better way of converting a pdf file from CMYK to RGB and vice versa?
When I printed the indd file the print driver would only allow me to print in Composite RGB - Composite CMYK and all the other options were greyed out. However, if I printed to Acrobat, Composite CMYK and the other options were available. Now as I'm printing to a CMYK laser printer, I would have thought it better to print in Composite CMYK. Am I correct?
And can anyone suggest why the printer driver won't allow it?

Edward
here are some useful operations by Professional Acrobat 7:
How to analyze image color spaces in a PDF:
Tools > Print Production > Preflight > Digital Press (Color) >
Execute > Overview > Images.
How to convert images in a PDF (here DeviceCMYK to sRGB):
Tools > Print Production > Convert Colors > Device CMYK:
Convert > Profile > sRGB > Embed as Output Profile > Execute
IMO there is no choice for an input CMYK profile.
I don't know whether embedded profiles (not to be expected
for CMYK) or a global Output Intent are honoured.
How to edit images without loading the whole PDF in
Photoshop (which would rasterize everything):
Tools > Advanced Editing > TouchUp Object Tool > Right Mouse
Click on Image > Edit Image > (Opens Image in PhS) >
Edit here > Save > Close (Shows PDF with modified Image) >
Save As by new name.
Best regards --Gernot Hoffmann

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

Convert cmyk to rgb in acrobat 7

Good morning,
I have a question about converting color spaces using Acrobat 7 Professional and Pitstop Pro.
I have some CMYK PDFs used for magazine printing that I need to convert to a 144 DPI RGB version for a digital edition.
I know most folks are concerned with RGB to CMYK but I need to do it in reverse...
If I do a Convert Color in Acrobat CMYK to RGB it looks a lot better than if I do it using an Action List command to Convert to RGB in Pitstop.
The Pitstop ones look almost posterized, way darker with significant color shifts
I would have thought Pitstop would use the Acrobat color engine to do the transformation to RGB but it seeems it knid of does it's own thing.
I do have sRGB selected in my Color Management Prefs in Acrobat.
It would be nice to make this RGB second version PDF with Pitstop and Distiller on our server so it runs more automated, less manual intervention...
thanks for any advice you have,
Pat

I think I stumbled across the solution... there are separate Color Management Preference controls for Pitstop.
I selected sRGB instead of the Enfocus Default RGB.

CMYK to RGB conversion in photoshop

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