The Truth About Pixels, Part 2-1: Printing 4x3 Inch Photos

Why is a 3 megapixel camera better than a 1 megapixel camera? It really depends on how you intend to reproduce the picture. The reason cameras produce pictures at 72 pixels per inch is that this format is standard in video uses such as television and DVD. So there is no noticeable difference in quality when viewing pictures on a TV or DVD. The difference appears when you are cropping and/or printing these pictures. If you are not familiar with the term cropping, I will explain it later. First, let's talk about printing.

Even the most inexpensive of printers these days are capable of printing at 300 dots per inch (dpi). Most are capable of printing at 600 dpi and you can buy relatively affordable printers that print at 1200 dpi and above. You may have noticed that with cameras it's called pixels per inch and with printers it is call dots per inch. The terms are hardware specific, but relate to the same principal. A printer prints a specific number of dots of ink per inch on the paper whereas a TV displays a specific number of pixels per inch on the screen. In either case, combining the dots or pixels creates the picture.

So how does this affect quality? If we're printing a picture that has 72 pixels per inch from a 1-megapixel camera on 4x3 printer paper we've got a problem. (Here is where I have to crunch some numbers, so please bear with me.) Let's figure it out. Four inches times 72 pixels (dots) per inch equals 288 pixels (dots) on the vertical line. Three inches times 72 pixels (dots) equals 216 pixels (dots) on the horizontal line. The total picture would have 288 times 216 or 62,208 pixels. That's way short of one million.

So where did the other pixels go? If you're printing this picture at a store or camera shop that has conversion capabilities, the machine that you are printing on actually crunches the picture down for you. The size of the picture taken by a 1-megapixel camera is approximately 16 inches x12 inches. (16x72=1152 and 12x72=864 and 864x1152=995,328 pixels). The machine makes this picture into a 4x3 by increasing the number of pixels per inch. The 4x3 picture is 1/4th the size of the 16x12 so there has to be four times as many pixels per inch to reduce this picture to 4x3. Four times seventy two equals two hundred eighty eight pixels (dots) per inch. With more pixels or dots per inch, the picture can be reproduced at a higher quality level making details sharper and more distinct. So a 1-megapixel camera can produce a reasonably good quality 4x3 inch picture on a 300 dpi printer. That's what most amateur photographers get with their snapshot cameras. If you try to get larger pictures, then the picture quality begins to deteriorate. Part 2-2 will deal with larger prints.

Conclusion: If you have a printer with more than 300 dpi capabilities and all you want is 4x3 inch prints, then you are not using all your printer's abilities. If you want prints larger than 4x3 inch, then you need a camera with a higher quality output capability. If all you want is 4x3 inch prints and video reproduction without cropping much, then a 1-megapixel camera and 300 dpi printer should serve you fine.

Note: Different printers produce different quality prints. Since this is a discussion of pixels and digital cameras, I do not get into choosing printers for the quality. Suffice it to say, if you have a reasonably good quality printer, then the information provided should work for you.

Note 2: There are ways to enlarge prints with lower dpi rates and size and still get quality results. This information will come in later discussions and is probably geared toward the more advanced photographers and digital dark room users.

Wayne Rockwell is a professional videographer at Legacy Pictures to Video and specializes in Video Montage creation and Photo Retouching.

In The News:


pen paper and inkwell


cat break through


Kodak Digital Cameras - The Giant Comes To Digital

George Eastman, founder of Kodak is world renowned today. Digital... Read More

Terms Used The In The Stock Photography Business

So you are a small business person or web designer... Read More

Better Photos with Your Digital Camera

Everyone has a digital camera today and we all take... Read More

How to take Great Photos of Your Pet

We all love our animals. They do such funny, adorable,... Read More

Bracketing and How To Use Tt Correctly...

What Is... Exposure BracketingExposure bracketing is a simple technique professional... Read More

Why 1.5 Megapixels is Enough

Dots Per Inch is a useful measure of relative resolution.... Read More

Nude Art Photography

Nude photography is the genre of art photography, whose subject... Read More

Digital Cameras & Resolution

While analyzing any camera, one of the most important qualities... Read More

Removing Spot Scratches in Your Treasured Photos ? 5 Minute Digital Fix

Probably one of the most common problems you will be... Read More

Using a Camcorder to Record Family Events Quickly and Easily

Let's start there (but not spend too much time on... Read More

Buying Your Child A Digital Camera - What You Need To Know

Purchasing any gift item for your child is a mind-numbing... Read More

Wildlife Scouting Cameras

For years I wondered how big the bucks were that... Read More

Black & White Photography

Photography is a diversified field of creating a spectral variety... Read More

Digital Camera Memory - An Introduction

The digital camera is essentially a computer-based device, whose core... Read More

Removing a Textured Pattern from a Scanned Photo ? 5 Minute Digital Fix

One of the most common problems when dealing with scanned... Read More

Take Spectacular Nighttime Photos with your Digital Camera - Part I

Night photographs express a special something that cannot be seen... Read More

Start Up a Nude Photography Business

There are major obstacles to overcome to get into nude... Read More

A Guide to Disposable Digital Cameras

Disposable Cameras (also called single-use cameras) first came on the... Read More

Digital Camera Metering

Looking at the most intricate details of the digital camera... Read More

Digital Camera Bags - Purchasing and Using

Some compact cameras are small enough to fit in your... Read More

Digital Film Processing is Really the Only Option for Truly Quality Prints

Digital photography has taken off like wildfire these days, primarily... Read More

Have You Read Your Digital Camera Manual?

Have you read the manual that came with your digital... Read More

Picture Framing for Photographers - Part 2

There are two sources for obtaining the moulding for making... Read More

Making Money With Digital Photography And Live Events

A few years ago I became interested in digital photography,... Read More

Photography Success Without School

What I learned from a mentor that enabled me to... Read More

Pinhole Photography: Right Back to Basics

Why Pinhole Photography?It's fun. It's creative. It's educative about the... Read More

10 MORE Ways to Make Money with Your Digital Cameras

1. Pet photos - advertise a Pet Photography business where... Read More

Tips for Purchasing a Digital Camera Lens

Your lens is an essential element to good photographs. It's... Read More

The Primer on Digital Camera Printers

Once you have clicked photos through your digital camera, then... Read More

Home Run Baseball Photography Tips

Strike one! Strike two! Strike three!Baseball! America's Pastime, and a... Read More

Digital Camera Memory Cards

A digital camera accessory you should purchase is a spare... Read More

How to Buy a Digital Camera

Are you buying your first digital camera? Well, you must... Read More

Who Had The Better Brushes Leonardo or Michelangelo?

Ordinary photos of dull subjects do actually sell, but the... Read More