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File size and image compression
The storage required for bitmap images
is the product of the image size,
Resolu-
tion and bit depth
. A 2-by-4-inch, 1200-
ppi, 24-bit color image, for example,
requires more than 34 MB (megabytes)
of storage, while the same image at
300-ppi requires about 2 MB.
Because bitmap images can require so
much storage, many techniques have
been developed for compressing image
data to reduce storage requirements.
Compression techniques are distin-
guished by whether they remove detail
from the image. Lossless techniques
compress image data without removing
detail; lossy techniques compress
images by removing detail.
The following techniques are commonly
used to compress bitmap image data:
• Run Length Encoding (RLE) is a loss-
less compression technique supported
by the TIFF file format and some
common Windows file formats.
Содержание ILLUSTRATOR 6.0
Страница 1: ...List of topics Menu commands Toolbar Index How to use this guide...
Страница 13: ...General Preferences dialog box Click on any option for information on that option return to text...
Страница 65: ...Tile Imageable Areas option Letter size page 40 x 60 artboard...
Страница 76: ...Document Setup dialog box Click on any option for information on that option return to text...
Страница 78: ...Drawing polygons Drawing spirals Drawing stars Tracing artwork Drawing continued...
Страница 193: ...Third click selects Fourth click selects next group next group group B group C...
Страница 205: ...Choose Arrange Result Repeat Transform as needed...
Страница 274: ...4 Choose Filter Create Fill Stroke for Mask then click OK Mask selected Fill Stroke for Mask filter applied...
Страница 406: ...Result...
Страница 528: ...Area Scatter...
Страница 553: ...Adding a drop shadow to a graph Displaying legends across the top of a graph Displaying overlapping columns of data...
Страница 555: ...Column and Stacked column cluster widths graph 1990 1980 75 50 25 0 Column Cluster 1990 1980 90 60 30 0 A B 120 150...
Страница 562: ...Graph with left axis Graph with same axis both sides 1990 1980 75 50 25 0 A B 1990 1980 75 50 25 0 75 50 25 0 A B...
Страница 630: ...Bitmap artwork See also Resolution and bit depth File size and image compression...
Страница 775: ...Separation Setup dialog box Click on any option for information on that option return to text...
Страница 780: ...Limitcheck error Out of Memory Not enough memory to perform the operation requested VM error...
Страница 879: ...Hatch concentration and direction Density Dispersion Rotation Scale Thickness Low value High value Original hatch...