The Difference Between Resolution and Measurement.

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If you've been thinking about purchasing art, this will be one of the most important videos you will ever see, because you will learn why your images tend to look great on screen but terrible once you print them. This is just one of many examples.

In this video you'll learn about the differences between resolution and measurement. Entering into the field of computer graphics is a wondrous experience, as the field is filled with endless opportunities for image creation and photo manipulation, but in the early stages, understanding the different terms can be confusing.

This article will give you insight into the basics of computer graphics with a variety of tips and fundamental instructions. Learning what to do before you get started can save you many hours of frustration later on.

The Differences between Bitmapped and Vector Graphics

One of the first things you will encounter in the world of graphics is the difference between bitmaps and vector graphics. Bitmaps (also known as raster images) are defined as pixels in a grid. Each pixel contains tiny dots of color which, when combined, make up the pictures you see on-screen. Vector graphics are composed of numerous scalable objects, such as lines and curves. These are defined mathematically, so no matter how much they are scaled, a high-quality result is assured.

The Relationship between Resolution and Measurement

In this section, we look at bitmaps. One issue for many new users is the relationship between resolution and the measured size of the image. One other wrinkle are the terms dots per inch (dpi) and pixels per inch (ppi). If you think of those two terms as meaning the same thing, that will reduce the confusion.

As an example, the above screen shot in Photoshop displays two images, a 3.75 x 5 inch photo of balloons, and a 10 x 10 inch photo of a sand dune. Yet, the balloons photo is nearly 4 times larger than the sand dune image. Why? This is due to the image resolution. The image of balloons has a resolution of 300 ppi (pixels per inch), while the sand dune photo has a resolution of 75 ppi.

To elaborate, if you convert the image measurements to pixels only, and multiply the resolution by the dimensions, you will soon realize that the balloons photo is actually 1200 x 1500 pixels in size. In contrast, the sand dune image is 600 x 750 pixels in size.

If you were to take the 8 x 10 photo and place it within the 4 x 5 image, this is what how it would appear.