Adobe photoshop elements 用户手册
CHAPTER 12
246
Saving Images
compress image data without removing detail;
lossy techniques compress images by removing
detail. The following are commonly used
compression techniques:
lossy techniques compress images by removing
detail. The following are commonly used
compression techniques:
RLE
Run Length Encoding is a lossless
compression technique supported by Photoshop
and some common Windows file formats. In
images with multiple layers containing trans-
parency, RLE compression will compress the
transparent portions of each layer.
and some common Windows file formats. In
images with multiple layers containing trans-
parency, RLE compression will compress the
transparent portions of each layer.
LZW
Lemple-Zif-Welch is a lossless compression
technique that provides the best results in
compressing images that contain large areas of
single color, such as screenshots or simple
paint images.
compressing images that contain large areas of
single color, such as screenshots or simple
paint images.
JPEG
Joint Photographic Experts Group is a
lossy compression technique that provides the
best results with continuous-tone images, such
as photographs. When you choose JPEG
compression, you specify the image quality by
choosing an option from the Quality menu,
dragging the Quality pop-up slider, or entering
a value between 1 and 12 in the Quality text box.
For the best printed results, choose maximum-
quality compression.
best results with continuous-tone images, such
as photographs. When you choose JPEG
compression, you specify the image quality by
choosing an option from the Quality menu,
dragging the Quality pop-up slider, or entering
a value between 1 and 12 in the Quality text box.
For the best printed results, choose maximum-
quality compression.
CCITT
CCITT encoding is a family of lossless
compression techniques for black-and-white
images. CCITT is an abbreviation for the French
spelling of International Telegraph and Telekeyed
Consultive Committee.
images. CCITT is an abbreviation for the French
spelling of International Telegraph and Telekeyed
Consultive Committee.
ZIP
ZIP encoding is a lossless compression
technique. Like LZW, ZIP compression is most
effective for images that contain large areas of a
single color.
effective for images that contain large areas of a
single color.
Saving images
You can use the following commands to
save images:
save images:
•
Save to save changes you’ve made to the current
file in the current format.
•
Save As to save an image with a different
location, filename, and/or format. The available
options vary depending on the format you choose.
options vary depending on the format you choose.
•
Save for Web to save an optimized image for the
To save changes to the current file:
Choose File > Save, or click the Save button ( ) in
the shortcuts bar.
the shortcuts bar.
To save an image with a different name and location:
1
Choose File > Save As.
2
Type a filename, and choose a location for
the file.
3
Click Save.
To save an image in a different file format:
1
Choose File > Save As, and choose a format
from the Format pop-up menu.
If you choose a format that does not support all of
the data in an image, a warning appears at the
bottom of the Save As dialog box. If you see this
warning, it is recommended that you save a copy
of the file in Photoshop format or Photoshop PDF
format in order to support all of the image data.
the data in an image, a warning appears at the
bottom of the Save As dialog box. If you see this
warning, it is recommended that you save a copy
of the file in Photoshop format or Photoshop PDF
format in order to support all of the image data.
2
Specify a filename and location.