RGB and CMYK are different color models. With RGB red, green and blue channels; CMYK is defined by the cyan, magenta, yellow, and black channels. You cannot expect the screenshot and printout to look the same just by looking at the file extension. Color model, profile and production conditions should be evaluated together.
This guide does not discuss color psychology, but rather the technical journey of the file between screen and print. You can also read brand color guide for what the brand color tells.
Color model and profile are not the same thing
The color model describes the structure of the channels. A profile helps interpret color values under a particular color space or device condition. Saying “File is CMYK” does not mean that it is ready for all printing conditions.
Find out what profiles and output settings are expected from the print shop. Paper, ink and printing method can have an impact on the result. Do not transfer settings left over from another job to a new project without thinking about it.
What can change when converting from RGB to CMYK?
Some colors visible in the source may not be reproduced identically under the target printing condition. In the transformation, colors are remapped to the target space. Differences may become apparent, especially in bright tones; But don't assume the same result in every file.
Preserving the original file and doing the conversion on a copy makes it easier to revert. Assigning a profile and converting it to a profile are different processes. Choosing a random profile without understanding the current state of the file can change the appearance of colors unexpectedly.
Black, small text and custom colors speak to manufacturer
Large dark surface and small text may not have the same production needs. Follow the manufacturer's specifications rather than giving a rote "rich black" recipe for every job. Small print, overprinting and special color requirements must be addressed in the technical control of the file.
When evaluating the printed surface with packaging designer Selçuk Aker, color decisions are not considered independent of the material. There may be a need for separate proofing for the color on the label and the color on a different box paper.
Don't make the screen preview the only evidence of the approval process
Can support calibration and color management display evaluation; but it does not fully display the texture and finish of the physical material. For critical jobs, determine the appropriate type of proof with the manufacturer. Customer should know which sample he approved.
The approval note may include file version, size, material, and expected production conditions. Print prep checklist combines color control with content and page controls. The best results come from production planned from the beginning, not from random conversion on the last day.
Frequently asked questions
Should I convert every image to CMYK immediately?
No. End use and workflow are important. Preserve the source file; Prepare the print output according to the manufacturer's required conditions.
Does a CMYK file guarantee that the colors will be exactly the same?
No. Profile, printing method, material and evaluation conditions affect the result.
Should I use CMYK in a web image?
Appropriate output supported by the display and broadcast system should be prepared for the web. Delivering the web image separately with the print-specific file often provides a clearer layout.
