Adobe 65045315 Photoshop Elements Manual - Page 297
About the PNG-24 format, About animated GIFs
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USING PHOTOSHOP ELEMENTS 10 291 Optimizing for the web 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 296 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 296 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 1/2/2012
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