Cyan color (C): Magenta color (M): Yellow color (Y): Black color (K):
In order to convert RGB to CMYK, you first have to divide RGB values by 255 to change the range from
0 - 255 to
0 - 1:
R* = R / 255 G* = G / 255 B* = B / 255
Now you can convert RGB to CMYK using these formulas:
Step 1: Calculate the black key color K:
K = 1 - MAX(R*, G*, B*)
Step 2: Calculate the cyan color C:
C = (1 - R* - K) / (1 - K)
Step 3: Calculate the magenta color M:
M = (1 - G* - K) / (1 - K)
Step 4: Calculate the yellow color Y:
Y = (1 - B* - K) / (1 - K)
example #1: convert color red
(255, 0, 0) to CMYK:
RGB = (255, 0, 0) CMYK = (0, 100, 100, 0)
example #2: convert color green
(0, 255, 0) to CMYK:
RGB = (0, 255, 0) CMYK = (100, 0, 100, 0)
example #3: convert color blue
(0, 0, 255) to CMYK:
RGB = (0, 0, 255) CMYK = (100, 100, 0, 0)
example #4: convert color white
(255, 255, 255) to CMYK:
RGB = (255, 255, 255) CMYK = (0, 0, 0, 0)
example #5: convert color black
(0, 0, 0) to CMYK:
RGB = (0, 0, 0) CMYK = (0, 0, 0, 100)
You should use RGB color mode for designs that will be displayed on device screens and will not be physically printed. Whether they’ll be viewed on computer monitors, smartphone screens, or TVs - RGB color mode is your best pick.
Use RGB if your project requires:
PNG: if your logo or graphic needs to be transparent, meaning it has no background, PNG is the perfect fit. Consider this file type for interface elements like buttons, banners, or icons.
JPEG: if your graphic does not need to be transparent, you should use this file format as it’s usually smaller in size and is a perfect format for images.
GIF: if you are using animated graphics such as moving logo or bouncing icon, or your image has any motion - this file type would is ideal.
It's best to avoid TIFF, EPS, and PDF because these formats are not compatible with most software and are usually larger in size.
You should use CMYK for designs that will be physically printed and not viewed on screen. Whether you will be printing business cards, stickers, or logotypes - CMYK color mode will give you more accurate results.
Use CMYK if your project requires:
It’s always best to consult your printer provider to find out which file format they prefer. Usually, it’s PDF, AI (Adobe Illustrator) or EPS.