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CHAPTER 2. USING GIMP 22
However, XCF is only suitable for GIMP. If you want to share your image or put
the image on the web, you should probably use another file formatas well as
XCF because most web browsers, image viewers, and other software packages
cannot read XCF.
See also: XCF Glossary entry
PNG: Portable Network Graphics PNG can preserve all the transparency and color
of your original image and uses powerful lossless compression to reduce file
sizes. In particular, computer-generated images usually compress very well.
Although PNG supports smooth transparency, today’s most popular web browsers
still don’t. While we wait for Microsoft to catch up, you’ll probably want to stick with
non-transparent PNG files on web pages. You can use transparency effectively
elsewhere though.
JPEG: Joint Picture Expert Group Photographs and other images from the real world
(which include most images taken with digital cameras and color scans) can be
compressed very effectively with JPEG. Usually screenshots, logos, and com-
puter generated images will not benefit from JPEG.
The JPEG method is lossy, which means that, although the saved image will
appear almost identical to the original, it will actually have hidden detail removed.
You should not use it on images that you intend to do additional processing on
later because the loss is exaggerated by repeated use.
The JPEG filter used by THE GIMP utilizes JFIF compression for compatibility
with most existing software. It allows you to adjust the quality of the image and
see immediately how the saved image will look and how big the file will be.
GIF: Graphics Interchange Format Unlike all the other file formats described here
GIF requires the use of a colormap. This means that a maximum of 256 different
colors will be preserved in the saved image. GIMP can handle the conversion au-
tomatically, but the results may sometimes be disappointing due to this limitation
of GIF.
Despite the poor compression and limited number of colors, there are two desir-
able features of GIF for web designers. They are simple forms of transparency
and animation. GIMP’s GIF filter supports both of these features.
Support for creating GIFs may not be included in your version of
GIMP due to patent problems.
BMP: WINDOWS Bitmap This format is often used by applications for Microsoft WIN-
DOWS. Full color images can be stored in this format, but shortcomings of the
compression scheme mean that the resulting files may be quite large. Image
resolution is preserved, but no other metadata is stored in the BMP format.
Some web browsers have included support for viewing BMP images but this is
not common, so you should avoid using them on the web.
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