The reason Ken Burns could create such a stunning documentary as "The Civil War," without movies of the action, was because the original photographs shot during the war by Mathew Brady, and many other photographers, have very high resolution. Considering all the photos were taken on pieces of glass coated with light-sensitive chemicals, the clarity of them is amazing. In fact, people have worked tirelessly throughout the long years to match that detail in modern photos.
History
When photography first came into its own as news and art form in the mid-1800s, photographs were taken using a "view" camera. That kind of camera consists of a board with a lens attached, bellows, a ground glass screen for focusing, a film holder and a tripod. The treated glass negatives were about 8-by-10-inches in size. So even though lenses weren't that good yet, the very size of the negative and the length of exposure gave stunning detail of non-moving objects. Moving objects blurred or became ghost images. By the time film came into use, the size of the image had shrunk dramatically.
Effects
George Eastman popularized photography by using roll film in a small rectangular box with a simple shutter and lens. The original images were small and round. Film went to 35mm size for most consumer uses and 120 size for medium format. The amount of film area on a medium-format negative is about 2.25-by-2.25-inches, a quarter of the size of those old glass negatives. As film and lenses got better, the size mattered less because more detail could be recorded in the image.
Significance
Image resolution, essentially, is how much detail can be recorded. The major factors determining this with film cameras are the quality of the lens, the accuracy of the aperture and shutter, the quality of the film and the size of the image recorded on the film. In general, better film shot through better lenses on better cameras produces better resolution in the final photographs.
Types
In digital cameras, resolution is measured in megapixels. Pixels are dots as seen on a computer screen. The more of them there are in a given space, the better the resolution and image quality. A million pixels make up a megapixel. Digital cameras, since their introduction, have made strides to increase the pixel count per inch to give film-quality images. Lower-end cameras might have resolutions of 3 or 4 megapixels. Middle-range cameras have 10 to 12 megapixel resolution and high-end cameras such as the Hasselblad H1 can reach 39 megapixels. This camera mimics the medium-format film Hasselblad, but still has not reached the 50 megapixel mark that is its film equivalent.
Potential
When the image is transferred to a printer from a computer, the image resolution is expressed in dots per inch. A standard magazine prints photos at about 300 DPI. For really high-quality prints, more dots per inch are necessary because more detail can be seen. Resolution is relative. Computer screens generally only can reproduce 72 pixels per inch. Not usually a problem, because images onscreen look good. Don't confuse what you see on the screen with what you print, however. An image that is 72 PPI and looks good on screen will look terrible and fuzzy as an 8-by-10-inch print. This confusion leads to misconceptions about the quality of images from a computer. To print a good-quality 8-by-10, 300 PPI and DPI is necessary.
The reason Ken Burns could create such a stunning documentary as "The Civil War," without movies of the action, was because the original photographs shot during the war by Mathew Brady, and many other photographers, have very high resolution. Considering all the photos were taken on pieces of glass coated with light-sensitive chemicals, the clarity of them is amazing. In fact, people have worked tirelessly throughout the long years to match that detail in modern photos.
History
When photography first came into its own as news and art form in the mid-1800s, photographs were taken using a "view" camera. That kind of camera consists of a board with a lens attached, bellows, a ground glass screen for focusing, a film holder and a tripod. The treated glass negatives were about 8-by-10-inches in size. So even though lenses weren't that good yet, the very size of the negative and the length of exposure gave stunning detail of non-moving objects. Moving objects blurred or became ghost images. By the time film came into use, the size of the image had shrunk dramatically.
Effects
George Eastman popularized photography by using roll film in a small rectangular box with a simple shutter and lens. The original images were small and round. Film went to 35mm size for most consumer uses and 120 size for medium format. The amount of film area on a medium-format negative is about 2.25-by-2.25-inches, a quarter of the size of those old glass negatives. As film and lenses got better, the size mattered less because more detail could be recorded in the image.
Significance
Image resolution, essentially, is how much detail can be recorded. The major factors determining this with film cameras are the quality of the lens, the accuracy of the aperture and shutter, the quality of the film and the size of the image recorded on the film. In general, better film shot through better lenses on better cameras produces better resolution in the final photographs.
Types
In digital cameras, resolution is measured in megapixels. Pixels are dots as seen on a computer screen. The more of them there are in a given space, the better the resolution and image quality. A million pixels make up a megapixel. Digital cameras, since their introduction, have made strides to increase the pixel count per inch to give film-quality images. Lower-end cameras might have resolutions of 3 or 4 megapixels. Middle-range cameras have 10 to 12 megapixel resolution and high-end cameras such as the Hasselblad H1 can reach 39 megapixels.
Enhance your photography skill,The Top Secret Photography Techniques
. This camera mimics the medium-format film Hasselblad, but still has not reached the 50 megapixel mark that is its film equivalent.Potential
When the image is transferred to a printer from a computer, the image resolution is expressed in dots per inch. A standard magazine prints photos at about 300 DPI. For really high-quality prints, more dots per inch are necessary because more detail can be seen. Resolution is relative. Computer screens generally only can reproduce 72 pixels per inch. Not usually a problem, because images onscreen look good. Don't confuse what you see on the screen with what you print, however. An image that is 72 PPI and looks good on screen will look terrible and fuzzy as an 8-by-10-inch print. This confusion leads to misconceptions about the quality of images from a computer. To print a good-quality 8-by-10, 300 PPI and DPI is necessary.
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