[ajoykumardas]

Hi Guys...

I have a question for you all. Usually i convert RGB image to CMYK in photoshop using:
IMAGE>MODE >CMYK

Sometime back i have seen you have another convertion method
VIEW> PROOF SETUP> WORKING CMYK
Does it only show WORKING CMYK or you can even convert the image to CMYK by it? If yes please do let me know how.

Another great question...
When you apply
VIEW > PROOF SETUP> SIMULATE PAPER WHITE
what is the best way to remove the dullness from the image?

Thanks in advance for your reply...

[cocknose]

isn't this in pdf preview?..

[liquid6]

Your first questions about the Image>Mode>CMYK. When you apply this, you are applying your CMYK color profile. Go to Edit>Color Settings. This allows you to modify you color profile. This profile is directly related to print though. If you are going to press with a graphic your total ink coverage is going to less for newsprint then on high calendared paper. As you will see you can change total ink coverage, dot gain and other aspects of your image. This why you see a shift in color when you convert from RGB to CMYK. This change happens mostly in your blacks...notice how they turn to a subtle grey?

Your WORKING CMYK is just how your monitor is going to display your color if you don't have it calibrated. You cannot do color conversions using this method. Actually the only way to do conversions is by Image>Mode>CMYK.

Simulating paper white allows you to import a profile of the paper that you are using for the press run. When you tell Photoshop to simulate paper white, Pshop will give you an approximate representation of what the image will look like when it goes to press. In order to make this work correctly you need to do some coloremetry on the paper and import the profile.

Any other questions?

[SGr]

I got to disagree with Liquid6 regarding the statement:
"Actually the only way to do conversions is by Image>Mode>CMYK"

When converting a RGB image to a CMYK gamut you need to know the spec of the prints and preferably have a dialogue with the printing facility so you can receive their CMYK profiles (most have the ICC profiles for download on their websites)

So if you use the Image>Mode>CMYK you will end up converting to you working CMYK profile (which you have specified in your color setting: Edit>Color management)

I would not recommend doing so since you are giving almost no control of how your image is converted.

In stead I would do as following:

Image>Mode>Convert to profile.
This will give you a better overview of the process of converting and also more options on the go, especially if you are converting to different CMYK profiles.

The proof setup gives you the option to see which color ranges within a color gamut is reproduction able in to a new color gamut.

(and a little site note always work (if possible) in a large color gamut and preferably high color dept and the at the end convert to the new color gamut - to ensure more bit dept to work with and less chance of images going bad)

SGr

[liquid6]

One other thing that I have been doing some research on is and RGB workflow. Yeah, yeah I know it seems way out there, but if you look at a RGB gamut verses a CMYK gamut, the RGB gamut is much bigger.

Also, when converting to CMYK you lose a lot of detail in the blacks and shadows; an RGB workflow allows you to maintain that shadow detail.

If you don't work in a large shop where your RIPs apply CMYK curves to the images, then this workflow is probably not your best bet.

Just some insite for you guys.