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Color in Process Printing

Topics

About RGB-CMYK

  • Scanners, digital cameras and computer monitors use red, green and blue (RGB) light to display color.
  • Commercial printing presses print with cyan, magenta, yellow and black (CMYK) ink, called process printing, instead of RGB light, and therefore produce a different range of color.
    See 4 color process printing explained for more info.
  • To print on a four-color press, all RGB files must be converted into CMYK color.
RGB colors with lights
RGB lights combine to make white
CMYK colors with ink
CMYK inks combine to create black
  • Certain RGB colors that you can see on your monitor or camera (in particular, bright vibrant colors) simply cannot be replicated with standard CMYK inks. These unachievable RGB colors are said to be "out of the CMYK color gamut." When selecting colors for your print project, we recommend using CMYK color builds to avoid potential RGB conversion issues.
  • You are more likely to notice color shifts when you use a solid, bright color as a background or fill.
RGB colors on a monitor
RGB Colors
(what you see on screen)

RGB in photos
CMYK colors on a press
CMYK colors
(printed with ink)

RGB on a press
Color photographs do not suffer much from the
RGB - CMYK conversion.
  • A highly useful tool for selecting reproducible CMYK colors is the Pantone Process Color Guide. This swatch guide displays over 3,000 colors with corresponding color builds, and is available on both coated and uncoated stock. Strongly recommended if you will be doing repeat printing projects, or have color concerns.
  • We can also print with PMS colors if you need a specific color that cannot be reproduced using process inks, but consider it to be Custom Printing. Contact us for a custom printing price quote.
You can improve the color accuracy of your monitor through a process called calibration. If you have critical color concerns, consider consulting a Pantone Process Color Guide or a hard copy proof. Be aware that:
  • Monitor types vary in how well they can display color and graphics. Generally, CRT monitors have the best color and resolution; flat and LCD monitors can have poorer color quality and limited resolution.
  • Individual monitor settings such as brightness, contrast, frequency, temperature, etc. will also affect your color accuracy.
  • What all this boils down to is that images on your monitor will always look somewhat different than the final printed piece.
Video about RGB and CMYK color

RGB - CMYK Conversion

To be able to print on a four-color press, all RGB files must be translated into CMYK. This conversion can be easily done in most image editing or graphic arts programs.
  • We are happy to convert your images from RGB to CMYK, at no charge. However we will do a standard-value conversion, which may not be perfectly to your liking. We cannot be responsible for sub-par results if you furnish RGB images.
  • You will have more control over the appearance of your printed piece if you do the color conversion yourself. We want you to be happy, so please take the time to prepare your file properly. If at any time you need further help, please call us at 800-924-2041 for assistance.
How to Convert from RGB to CMYK in Many Common Programs
Adobe Illustrator 10, CS-CS5
  • Select File/Document color mode/CMYK color
Adobe InDesign CS-CS5
  • Select Window/Swatches & Window/Color
  • Double-click Color in Swatches
  • Change color mode to CMYK & color type to Process
  • Any colors created in the document that are not in the Swatches palette need to be changed to the CMYK color space
  • Select each object you want to convert and make sure the Color palette reflects the CMYK percentages
  • Click top right arrow in the palette to change to CMYK if necessary
  • Send us your layout and linked images
Adobe Pagemaker 6.5
  • Select Window/Show Colors
  • Double-click Colors in palette
  • Select Model to be CMYK & Type to be Process
Adobe Photoshop    Existing file:
  • Select Image/Mode/CMYK
   New file:
  • Select CMYK for the mode before clicking OK
CorelDraw 9
  • Select each object you want to convert
  • Select the Fill tool and click Fill Color Dialog
  • Make sure the color model is CMYK
  • For each object with an outline:
  • Select the Outline tool and click the Outline Color Dialog
  • Make sure the color model is CMYK.
Microsoft Publisher 2003
and later
  • Select File Tab, then select Info. Select Commercial Print Settings
  • Select Choose Color Model, then Select Process Colors (CMYK)
QuarkXpress 4.1
  • Select Edit/Edit Colors/Show Colors in Use/Highlight Color; click Edit
  • Change model to CMYK; deselect Spot color
  • Send us your layout and linked images

Adobe PhotoDeluxe
Adobe Photoshop LE
Microsoft Excel
Microsoft PhotoDraw
Microsoft PowerPoint
Microsoft Word
Microsoft Works
Picture It Publishing

These programs do not have the capability to convert to CMYK.
We are happy to do the conversion for you free of charge!

Monitor Calibration

You can improve the color accuracy of your monitor through a process called calibration. By adjusting your monitor settings to match our press output as closely as possible, you will be able to see which colors match, which don't and how they vary. Due to inherent differences between RGB light and CMYK ink, images on your monitor will always look somewhat different than the final printed piece.
How to Calibrate Your Monitor
  1. You need a sample of something PrintingForLess.com has printed, as well as the final electronic file which was sent to press. This can be an order you have received, or if you have not ordered from us, we are happy to send you printed samples and a copy of our Design Guide.
  2. Begin the calibration process by performing the following adjustments to your monitor.
    • Brightness: Adjust the brightness setting to 50 - 60% of maximum intensity.
    • Contrast: Adjust the contrast setting to 100% of maximum intensity.
    • Monitor Color Temperature: Adjust to 5000K, 5500K or 6500K. If set at 9300K, colors will appear much brighter on monitor than they will when printed.
  3. Open the electronic file of your hard-copy printed sample. If you are using an existing order, be sure to reference the final version. Ideally, this is the Press-Ready PDF proof that you approved. If you are using our Design Guide, choose the file closest to your screen resolution.
  4. Compare the colors in the printed sample to the colors on your monitor. Make note of which colors match, which don't and how they vary.
    • Fine Adjustment: If your monitor allows for individual adjustment of red, blue and green channels, adjust your monitor to match the colors on the printed sample even more closely.
  5. We hope that this process help you become better informed about the differences between what your monitor can display and what we will produce on press.
monitor calibration image
Even a perfectly calibrated monitor has limitations. Monitors display color with light, while presses print with ink. There are some inherent differences in the visual results. Paper brightness, paper type, applied coatings and ambient light will also affect the final look of your printed piece. If you have critical color concerns, consider consulting a Pantone Process Color Guide or a hard copy proof.
FAQs

Can I order 2-color printing from you?

We suggest you get the best value for your dollar and go for full color, instead of two-color! Nonetheless, you may use any of our product pages (with the exception of postcards, business cards, presentation folders, catalogs and calendars) to order two-color printing. Simply place your order as usual, then specify in the comments section that it's a two-color job and what PMS colors you have selected. Since we are so efficient at producing high-quality four-color work, two-color pieces will be priced the same as four-color pieces. Two-color postcards, business cards, presentation folders, catalogs and calendars will generally be converted to four-color process equivalents before printing. If you need to produce 2-color business cards or postcards using spot inks, you can request custom printing prices online. Learn more about 2 Color Printing.

How well will my job match what I see on my monitor?

Most people are surprised at how well their job matches what they see. But because of wide differences in monitor calibration and the different technologies used, some printed colors may not exactly match the colors on your specific monitor. Please see our RGB - CMYK Information page for important instructions on getting the results you want. Our Design Hints page has additional information and illustrations.

Will the colors match a sample I print out on my own printer, or a previously printed sample?

At PrintingForLess.com, part of the way we offer fast turnaround and low pricing is by printing to a "pleasing color" standard, using standard ink densities. Therefore, there is no guarantee that your finished piece will approximate your printed sample. This is due in part to the widely varying results from different output devices including inkjet and laser printers, continuous tone proofing devices, high-resolution film-based proofs, and different than true offset lithography. Even from one commercial printing firm to another, there can be significant differences in results. In particular, inkjet and laser prints are known to look substantially different than true offset lithography.
If you require precise color match, please contact us to arrange for a digital color proof. Once you approve the additional fees (starting at $40), we will produce and send you a hard proof via overnight delivery. When you approve and return the proof, we will strive to match the color of the proof when printing your final piece.
There can be substantial additional charges for precise color match services. Also, if you request color correction or other changes after you see your proof, there could be charges for color correction time and a new proof.
Bottom line: the final product we produce for you is unlikely to match the output from your inkjet -- it will look more professional!

What is the difference between the RGB and CMYK color space and why does it matter?

RGB refers to the primary colors of light, Red, Green and Blue, that are used in monitors, television screens, digital cameras and scanners. CMYK refers to the primary colors of pigment: Cyan, Magenta, Yellow, and Black. These are the inks used on the press in "4-color process printing", commonly referred to as "full color printing" or "four color printing".
The combination of RGB light creates white, while the combination of CMYK inks creates black. Therefore, it is physically impossible for the printing press to exactly reproduce colors as we see them on our monitors.
Many programs have the capability to convert the layout/images from the RGB color space to the CMYK color space. We request that you convert your colors from RGB to CMYK if your tools allow you to. By doing it yourself, you have maximum control over the results. You may notice a shift in color when converting from RGB to CMYK. If you do not like the appearance in CMYK, we recommend that you make adjustments while working in CMYK (usually lightening). Generally, you should specify CMYK color builds that look a little lighter than you want, since the dots of ink "fatten up" on press, giving you more pigment on paper than you see on your monitor. Be especially careful to keep backgrounds light if there is black or dark colored text over it, so that the text remains readable.
See our RGB and CMYK Information page for more details.

How can I know what a particular CMYK color combination will look like?

To purchase a color guide with over 3,000 process colors with their CMYK screen percentages, please visit CreativePro.
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