ADOBE PHOTOSHOP ELEMENTS 9

USING PHOTOSHOP ELEMENTS 9
Optimizing for the web
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PNG-8 with 256 colors and no dither (left), and PNG-8 with 16 colors and dithering (right)
More Help topics
“Preserve background transparency in a GIF or PNG image” on page 284
About the PNG-24 format
The PNG-24 format supports 24-bit color. Like the JPEG format, PNG-24 preserves the subtle variations in brightness
and hue found in photographs. Like the GIF and PNG-8 formats, PNG-24 preserves sharp details like those in line art,
logos, or type.
The PNG-24 format uses the same lossless compression method as the PNG-8 format. For that reason, PNG-24 files
are usually larger than JPEG files of the same image. You may want to avoid PNG-24 format when you are distributing
your image to a wide audience.
In addition to supporting background transparency and background matting, the PNG-24 format supports multilevel
transparency. You can have up to 256 degrees of transparency from opaque to completely transparent, so you can
blend the edges of an image smoothly with any background color. However, not all browsers support multilevel
transparency.
More Help topics
“Preserve background transparency in a GIF or PNG image” on page 284
About animated GIFs
Animated GIFs create the illusion of movement by displaying a sequence of images, or frames, over time. Photoshop
Elements provides a powerful, easy way to create animated GIFs from a multiple-layer image.
To create an animated GIF file, you work with layers. Each layer becomes a frame when Photoshop Elements generates
an optimized animation. The animated GIFs are compiled into a RGB color document in the Edit workspace.
You can open an existing animated GIF file using the Open command from the Edit workspace. For each frame in the
file, Photoshop Elements creates a layer. To view a specific frame in the document window, make the layer for that
frame visible in the Layers panel, and hide other layers.
Last updated 1/27/2011