Corel PaintShop Pro X7, DE User's Guide Page 763

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Creating images for the Web 759
87a, which cannot. Both are recognized by most browsers and
use lossless compression.
JPEG — this format efficiently compresses photographic images. It
supports 24-bit (16.7 million) color, uses lossy compression, and is
recognized by most browsers.
PNG — this increasingly popular format efficiently compresses
images. It supports up to 24-bit (16.7 million) color and uses
lossless compression. It is not as widely used as JPEG, so some
features of this format are not available for older browsers.
Wireless Bitmap (WBMP) — this format is used with many wireless
devices. The images are black and white and have lossless
compression.
What’s the difference between lossy and lossless compression?
Lossy compression is a compression method that eliminates data to
reduce the file size. Lossless compression retains all of the original
image data and reduces the file size by storing patterns of pixels in the
image.
To flatten an image
Edit workspace
Choose Layers Merge Merge All (Flatten).
Working with GIF files
Corel PaintShop Pro lets you optimize GIF files to maximize quality
while minimizing file size. You can save images with or without
transparency, depending on how you want to display them on your
Web pages.
Paletted images (those with 256 or fewer colors, such as GIF or PNG
files) do not support transparent backgrounds, but you often need to
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