Graphics Reference
In-Depth Information
Optimizing a PNG-24 Document
The PNG-24 file format is used primarily for images that contain lots of colors with soft
transitional edges, such as photographs, and was designed as an alternative to the JPEG
file format. The PNG-24 format generates an image with millions of colors, and still man-
ages to reduce the size of a file. While similar to the JPEG file format, the PNG-24 uses
lossless compression, and does not compress files as small as the JPEG format. So for the
time being, most designers are still using the JPEG format for creating faster-loading web
graphics.
Optimize a PNG-24 Document
Open a document.
Click the
File
menu, and then click
Save for Web
.
Click the
Original
,
Optimized
, or
2-Up
tabs to view the document using differ-
ent layouts.
Click one of the sample images to change its default format.
Click the
Optimized File Format
list arrow, and then click
PNG-24
.
Select from the following options:
Transparency Options:
•
Transparency.
Check to keep the transparent areas of a PNG-24 image trans-
parent.
•
Matte.
Click to fill the transparent areas of a PNG-24 image.
Other Options:
•
Interlaced.
Check to have the PNG-24 image load in three scans.
Click
Save
to save the current image, and then save it using the Save Optimized
As dialog box.
