The fine points of digital pictures.
Pixel: The building block of all digital
pictures.
Effective/Image Resolution: The number
of pixels that make up a digital image (defined by pixels
wide by pixels high).
Megapixel (MP): One million pixels/image
(i.e. 1000 x 1000 pixels = 1 million).
Pixels Count: The more pixels you capture,
the more picture detail you’ll have.
When printing pictures, a good rule of thumb is:
- At least 1 MP for 5" x 7"
- At least 2 MP for 8" x 10"
- At least 3 MP for 11" x 14"
- At least 4 MP for 20" x 30" JPEG file format: (Joint
Photographic Experts Group)
This is the image file format of choice by most digital
camera manufacturers. Compression: What NOT to do to
your digital pictures! PRO – Able to fit more pictures
on a storage card by reducing file size through compression.!
CON – Compression reduces file size by averaging values
of the scene, thus eliminating valuable picture information.
Compress and lose.
The fine points: Get close. Get closer.
Optical zoom: Lets you get close and
compose your scene while maintaining image quality.
An optical zoom works the same way as a traditional
zoom lens. The optics maintain image quality throughout
the zoom range of the lens.
Digital zoom: Offers the flexibility
to compose before taking the picture. There are no moving
parts. The zooming takes place using the camera’s software.
However, digital zoom may limit the overall size of
the print. A 2 MP camera is capable of producing a quality
8" x 10" print without zoom. When using the digital
zoom at 2X, the largest print size with good quality
would be approximately 3 ˝" x 5".
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