The best way to master Adobe Photoshop. Photoshop Tips & Tricks is built on reader questions about image manipulation, painting and getting the most from Photoshop. In the Design & Publishing Center,   Photoshop Tips & Tricks Department. . .

RGB or CMYK?

work in the color space you need

The Question:
Unexpected color
:
How can I get CMYK color same as a RGB format. i make a design with a RGB format, when the printer need to produce color separation. they need the CMYK format. so, when i try to change color format from RGB to CMYK the color is out of my expectation.
Our reply to a question sent in by: hairulanuar muhidin
 
This is a frequent problem. If you know you're going to need the final image in CMYK format it's best to start in that format. If your image is acquired (via digital camera or scanner) in RGB format, then you should make the switch to CMYK before any modifications. Once in CMYK your color balancing and changes can be implemented to suit, and they'll stay that way.
    Keep in mind that it might not be the switch that is fouling the color, but rather your color calibration. If you do a lot of CMYK, for printing, then you should attempt to get your system and monitor properly calibrated. Poor calibration and mismatched printer profiles are probably the most frequent reason for unsuitable color.
    It's always easier to go from CMYK to RGB, than the other way.
Printing? Another reader wrote:
How do I make the printer output look like the original photo? I have an Apple G3 Blue & White 450; 1220 dpi Astra scanner; Epson Phot 750 printer. I scan the photo... it looks just fine on the screen, but the print is always different. Any tips? Thanks (from 'John')
  1. Make sure you've properly installed the printer drivers and software.
  2. Obtain from the Printer's CD, or from the Manufacturer's web site the latest "Color Profile", then make sure it's the default profile for your system print driver.
  3. Also get the most current 'ppd' or printer driver.
  4. READ the printer's documentation. Many inkjet printers prefer RGB because they convert to CMYK on the fly. The manufacturer builds in the appropriate specifications to get the best possible results. If you intercede by setting up the CMYK yourself, your results will suffer.
Keep in mind that color viewed on a monitor will never duplicate the same image printed. Use the Adobe Gamma wizard and make sure your gamma is as close to correct as you can get it. For more ambitious workstations, you can purchase very accurate calibration equipment but it carries a hefty price tag as well.
 
Retrieved from Photoshop 911: 10/01/2002
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