Adobe photoshop elements 사용자 설명서
CHAPTER 2
48
Getting Images into Photoshop Elements
Printer resolution
The number of ink dots per
inch (dpi) produced by all laser printers. Most
desktop laser printers have a resolution of 600 dpi.
Ink jet printers produce a spray of ink, not actual
dots; however, most ink jet printers have an
approximate resolution of 300 to 600 dpi and
produce good results when printing images up
to 150 ppi.
desktop laser printers have a resolution of 600 dpi.
Ink jet printers produce a spray of ink, not actual
dots; however, most ink jet printers have an
approximate resolution of 300 to 600 dpi and
produce good results when printing images up
to 150 ppi.
File size
The digital size of an image, measured in
kilobytes (K), megabytes (MB), or gigabytes (GB).
File size is proportional to the pixel dimensions of
the image. Images with more pixels may produce
more detail at a given printed size, but they require
more disk space to store and may be slower to edit
and print. For instance, a 1-by-1-inch, 200-ppi
image contains four times as many pixels as a
1-by-1-inch, 100-ppi image and so has four times
the file size. Image resolution thus becomes a
compromise between image quality (capturing all
the data you need) and file size.
File size is proportional to the pixel dimensions of
the image. Images with more pixels may produce
more detail at a given printed size, but they require
more disk space to store and may be slower to edit
and print. For instance, a 1-by-1-inch, 200-ppi
image contains four times as many pixels as a
1-by-1-inch, 100-ppi image and so has four times
the file size. Image resolution thus becomes a
compromise between image quality (capturing all
the data you need) and file size.
Another factor that affects file size is file format—
due to varying compression methods used by GIF,
JPEG, and PNG file formats, file sizes can vary
considerably for the same pixel dimensions.
Similarly, color bit-depth and the number of layers
in an image affect file size.
due to varying compression methods used by GIF,
JPEG, and PNG file formats, file sizes can vary
considerably for the same pixel dimensions.
Similarly, color bit-depth and the number of layers
in an image affect file size.
Photoshop Elements supports a maximum file size
of 2 GB and maximum pixel dimensions of 30,000
by 30,000 pixels per image. This restriction places
limits on the print size and resolution available to
an image.
of 2 GB and maximum pixel dimensions of 30,000
by 30,000 pixels per image. This restriction places
limits on the print size and resolution available to
an image.
Changing image size and
resolution
resolution
Once you have scanned or imported an image,
you may want to adjust its size. The Image Size
command lets you adjust the pixel dimensions,
print dimensions, and resolution of an image.
you may want to adjust its size. The Image Size
command lets you adjust the pixel dimensions,
print dimensions, and resolution of an image.
Keep in mind that bitmap and vector data can
produce different results when you resize an
image. Bitmap data is resolution-dependent;
therefore, changing the pixel dimensions of a
bitmap image can cause a loss in image quality and
sharpness. In contrast, vector data is resolution-
independent; you can resize it without losing its
crisp edges.
produce different results when you resize an
image. Bitmap data is resolution-dependent;
therefore, changing the pixel dimensions of a
bitmap image can cause a loss in image quality and
sharpness. In contrast, vector data is resolution-
independent; you can resize it without losing its
crisp edges.
Displaying image size information
You can display information about the current
image size using the information box at the
bottom of the application window (Windows)
or the document window (Mac OS). (See “Using
the status bar” on page 30.)
image size using the information box at the
bottom of the application window (Windows)
or the document window (Mac OS). (See “Using
the status bar” on page 30.)
To display the current image size:
Click the file information box, and hold down the
mouse button. The box displays the width and
height of the image (both in pixels and in the unit
of measurement currently selected for the rulers),
the number of channels, document dimensions,
and the image resolution.
mouse button. The box displays the width and
height of the image (both in pixels and in the unit
of measurement currently selected for the rulers),
the number of channels, document dimensions,
and the image resolution.