10
Basic techniques for better images
A digital image is made up of a collection of small dots called pixels.
If it contains a large number of pixels, the picture becomes large, it takes up more memory,
and the image is displayed in fine detail. “Image size” is shown by the number of pixels.
Although you cannot see the differences on the screen of the camera, the fine detail and data
processing time differ when the image is printed or displayed on a computer screen.
Description of the pixels and the image size
Selecting the image size for use (page 25)
Selecting the image quality (compression ratio) in combination (page 46)
You can select the compression ratio when digital images are saved. When you select a high
compression ratio, the image lacks the fineness of detail, but has a smaller file size.
Quality
On “image quality” and “image size”
1
Image size: 7M
3072 pixels × 2304 pixels = 7,077,888 pixels
2
Image size: VGA(E-Mail)
640 pixels × 480 pixels = 307,200 pixels
Pixel
Many pixels
(Fine
image quality and
large file size)
Example: Printing in
up to A3 size
Few pixels
(Rough
image quality but
small file size)
Example: An attached
image to be sent by e-
mail
3072
2304
480
640
Pixels
