Table of Contents
Advertisement
ADOBE PHOTOSHOP ELEMENTS 4.0
73
User Guide
Understanding file compression
Many image file formats compress image data to reduce file size. Lossless compression preserves all image data
without removing detail; lossy compression removes image data and loses some detail.
The following are commonly used compression techniques:
RLE (Run Length Encoding)
Lossless compression technique that compresses the transparent portions of each layer
in images with multiple layers containing transparency.
LZW (Lemple-Zif-Welch)
Lossless compression that provides the best results in compressing images that contain
large areas of single color.
JPEG
Lossy compression that provides the best results with photographs.
A family of lossless compression techniques for black-and-white images.
CCITT
ZIP
Lossless compression technique that is most effective for images that contain large areas of a single color.
To set file saving preferences
Choose Photoshop Elements > Preferences > Saving Files, and set the following options.
O
Saves a preview image with the file. Select Never Save to save files without previews, Always Save to
Image Previews
save files with specified previews, or Ask When Saving to assign previews on a file-by-file basis.
Specifies an option for the three-character file extensions that indicate a file's format: Select
Append File Extension
Never if you don't want to include the format extension, Always if you always want the three-character extension
added, or Ask When Saving if you want the flexibility to choose when the extension is added. The default setting is
Always.
Select this option to automatically discard any color profiles used by your digital
Ignore Camera Data (EXIF) Profiles
camera. The color profile you use in Photoshop Elements is saved with the image.
Saves a composite image in a layered Photoshop file so that it can be imported or
Maximize PSD File Compatibility
opened by a wider range of applications: Select Never to skip this step, Always to automatically save the composite,
or Ask if you' d like to be prompted each time you save a file.
Specifies how many files are available in the File > Open Recently Edited File
Recent File List Contains: _ Files
submenu. Enter a value from 0 to 30. The default value is 10.
See also
"To save changes to the current file" on page 67
Processing camera raw image files
About camera raw image files
A camera raw file contains unprocessed picture data from a camera's image sensor. Think of camera raw files as your
photo negative. Many digital cameras can save raw format files. You can open a raw file in Photoshop Elements,
process it, and save it—rather than relying on the camera to process the file. Working with camera raw files lets you
set the proper white balance, tonal range, contrast, color saturation, and sharpening.
You can reprocess the file repeatedly to achieve the results you want. Photoshop Elements doesn't save your changes
to the original raw file, but it saves the last setting you used to process it.
Advertisement
Table of Contents
