I made something that can help visualize how many MP is needed to make a high resolution prints or view the image on a screen. 150 DPI requires to focus very close
Is 1192 x 842 pixels high enough resolution for A3-sized paper? - Quora
Pixel Size Calculator - print sizes in pixels
A3 Size Paper | Quill Paper Buying Guide | Quill.com
Force Fax Resolution
Setting the maximum canvas size for printing | Search | Autodesk Knowledge Network
Best DPI for Printing Photos & Standard Photo Sizes (Guide)
Paper Sizes Guide, UK Flyer & Poster Sizes in CM & Inches, A3, A4, A5 & A6 | instantprint
Converting image sizes for different paper sizes | ePHOTOzine
Paper Sizes Guide, UK Flyer & Poster Sizes in CM & Inches, A3, A4, A5 & A6 | instantprint
A4 size in pixels. Convenient calculator with different DPIs.
Pixels to Print Size Calculator
Procreate Canvas Size and Resolution • Bardot Brush
A1 Size Paper | Quill Paper Buying Guide | Quill.com
Approximate Values for Recording Pixels (for printing on paper or other purposes)
A4 Format | A4 paper size & Uses | A-Series Paper | Adobe
A Paper Sizes to Pixels
What is the Right Digital Art Canvas Size? Important things to Consider to Make the Best Choice. - Artsydee | Drawing, Painting, Craft & Creativity
Confused about HiDPI and Retina display? ― Understanding pixel density in the age of 4K | EIZO
Choosing a camera Part 1: should I worry about pixel size?: Digital Photography Review