7.4

Format: Extension: Type: PlanetPress Design supports:
BitMap Pic-
ture
BMP Bitmap
1-, 4-, 8-, and 24-bit images in Windows format. Supports uncompressed and Run Length
Encoded (RLE) formats. Does not support RLE for 24-bit images.
Encapsulated
PostScript
EPS
Vector,
Metafile
EPS files that conform to the Adobe Encapsulated PostScript
File Format Specification (Adobe Technical Note #5002).
Joint Pho-
tography
Experts
Group
JPEG, JPG Bitmap
8-bit grayscale and 24-bit color images. Supports save quality, progressive save, and opti-
mized Huffman codes.
Portable Doc-
ument For-
mat
PDF Metafile PDF 1.5 format (Acrobat 6) without encryption or security settings.
Portable Net-
work Graph-
ics
PNG Bitmap
1-, 4-, 8-, and 24-bit images. Supports gamma adjustments, progressive save, and variable
compression levels. Also reads but does not consider the alpha channel.
Tagged
Image File
Format
TIF, TIFF Bitmap
1-, 4-, 8-, and 24-bit uncompressed images. TIFF images that use LZW compression. CCITT
group 3 1D, CCITT group 3 2D, CCITT group 4, Packbits, Zlib (deflate), JPEG. Also supports
multi-page images but restricts output to only the first image.PlanetPress Design now supports
TIFF images that use LZW compression.
In the case of dynamic images that reference images external to the document, in addition to the supported formats listed
above, documents can also accept images in the PostScript format generated by the Image Downloader.
Image Glossary
Defining images in PlanetPress Design requires that we first establish a few terms that will be used throughout this chapter.
Bitmap File Formats
A bitmap file format stores an image as a set of pixels. Common bitmap formats are BMP, TIFF, PNG and JPEG. Images such
as photographs typically use a bitmap format.
The disadvantages of bitmap images are loss of image quality when scaling, and large file sizes for images with large pixel
dimensions and color depths.
Vector File Formats:A vector file format encodes an image as a set of commands or mathematical equations. Encap-
sulated PostScript (EPS) is a common vector format. Images such as illustrations typically use a vector format.
In a vector format, the commands precisely describe how to draw the image. The advantage of images in vector format is that
they scale without loss of color, detail, or sharpness. Depending on the complexity of the image they describe, they may also
have a smaller file size than their bitmapped counterpart. The disadvantage is that they require the computer or printer to
interpret the commands and render the image.
Metafile Format
A metafile image format can include both bitmapped and vector images. PlanetPress Design supports images in both Encap-
sulated PostScript (EPS) and Portable Document Format (PDF) metafile formats.
As for vector images, a metafile image file specifies a size for the image. In this case, if the metafile image contains bitmapped
images, scaling it may affect the image quality of those bitmapped images.
Resolution
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