Have you edited a photograph on your computer and when you went to print it, it was just a tiny image on the page? Ever wondered why your mother’s e-mail inbox rejects the photos of your kids ?
If you are just getting started with digital scrapbooking, then this short lesson is for you. It is simpler than you might think.
Digital Resolution
The tiny dots that make up an image are called pixels. The word “pixel” is a contraction of the words “picture” (or “pix”) and “element” and generally is the smallest part of any type of digitally represented image. People are easily confused because the word pixel assumes subtle differences in meaning depending on the context in which it is used such as in printed images or the megapixels in a digital camera.
To simplify this discussion, just think of a pixel as a tiny point of light or color representing a very small component of a much larger image.
People also talk about resolution when referring to pixels. Resolution is a measurement of how many pixels fit into a certain defined space. You may have heard of “dots per inch” (DPI) or “pixels per inch” (PPI) and the meaning of these two terms adds to the confusion because once again it depends on the context in which the term is used.
Let’s simplify once again by saying that image resolution is an expression of how much detail an image holds.
Our TVs, computer monitors, cell phones, and even digital cameras are full of pixels – thousands and thousands of them all crammed together so closely it tricks the human brain into thinking these tiny dots are a smooth image. These digital images appear just about anywhere we look in our technology filled world, from our PDAs to our car dashboard to the giant electronic billboards on display along the highway or in New York’s Times Square.
The more pixels in an image, the better the image looks. On the contrary, if the pixel count is too low, the image quality suffers. So you may be able to distinguish the individual dots in a microwave display but a printed digital photo looks as smooth as glass. A pixelated image results when the pixel count is so low, you can see the jaggy edges.
Digital cameras have made sharing photos easier than ever. No longer do you have to get film developed and multiple copies printed. Today, many people share their photos through email and social network sites. However, before doing this the image taken from the digital camera is usually downsized.
Digital cameras are built to duplicate film camera quality and therefore capture images with a huge pixel resolution. Compare that to nearly all home computer displays that have a low pixel count, generally under 100 pixels in an inch. Displaying high resolution images on a low resolution device results in an image that appears much bigger than the computer screen. Digital cameras catch images at high resolution to make possible photographic quality prints. But sending this large image file by e-mail will take megabytes of data and many e-mail users will reject it.
Digital Photo Editing
The solution is to resample the image which is geek speak for changing the resolution. Decreasing the number of pixels will make the image appear normal on a computer monitor. And this will let you e-mail Mom with the latest family photos from your latest vacation. But after resampling the image, don’t think that you will still get a quality print any longer since you’ve taken out so many pixels.
The guiding principle now seems simple. Images intended for printing need to be at a high resolution but images displayed on a computer screen need only a low resolution.
If you plan to do both, make a copy of your original digital image for playing around with. Besides allowing for both printing and viewing images correctly, this is also a suggested backup plan for all of your digital images.
Now you are ready to take lots of digital photographs and be able to print and share them without further problems.