All Guides
How to Enlarge a Photo for Printing Without Losing Sharpness
Divide pixel width by print width to find your real PPI, then upscale properly. DPI targets by poster size, the limits of upscaling, and the best material for big photo prints.
How to Upscale Images Free and Still Print Them Sharp
Free ways to upscale an image for print, the pixel maths that tells you whether you need to, and the files that should be rebuilt as vector instead of resampled.
The Smallest Font Size You Can Print and Still Read
The smallest printable font is about 4pt on coated stock, 6pt for disclaimers and 8pt for anything read properly. Here are the real floors and where each fails.
2-Color Printing Using Pantone or Spot Color Inks
Two-color printing uses two Pantone spot inks for crisp, on-brand color at a lower cost than full CMYK. Learn when to use it and how to set up your file.
How to Match Pantone to CMYK Color
How to match Pantone (PMS) to CMYK for print. A practical conversion method, a Pantone-to-CMYK values chart, and brand-color tips for cards and flyers.
Understanding OSHA Safety Colors and ANSI Color Codes for Workplace Safety
OSHA and ANSI safety colors and their meanings, from danger red and warning orange to safety green, plus hard hat colors and how to print the exact code.
Pantone Spot Color Printing for Brand Accurate Business Cards
Why CMYK drifts and Pantone spot ink stays exact, which brand colors fall outside the process gamut, and how to supply PMS values for brand accurate cards.
What CMYK Stands For and Why Print Files Use It
CMYK stands for cyan, magenta, yellow and key, the four press inks. Here is why K means key, how CMYK differs from RGB, and how to set up a print file.
What the Pantone Color of the Year Is and How to Print It
The Pantone Color of the Year is one shade named each December by the Pantone Color Institute. How it is chosen, and how to print 2026 Cloud Dancer on paper.
How to Build or Rent a Mailing List for Direct Mail
How to build or rent a mailing list for direct mail. Compare renting, buying, and building, then print addressed postcards at 4OVER4.COM.
Types of Direct Mail Advertising
Types of direct mail advertising: postcards, letters, brochures, catalogs, flyers, and EDDM. See which fits your campaign and print it at 4OVER4.COM.
How to Add a QR Code to Your Postcards
How to add a QR code to your postcards: sizing, placement, quiet zone, and print contrast rules so every scan works on the first try.
