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.IX Title "PDF::Builder::Resource::XObject::Image::GIF 3pm"
.TH PDF::Builder::Resource::XObject::Image::GIF 3pm "2021-03-28" "perl v5.32.1" "User Contributed Perl Documentation"
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.SH "NAME"
PDF::Builder::Resource::XObject::Image::GIF \- support routines for GIF image library. Inherits from PDF::Builder::Resource::XObject::Image
.SH "Supported Formats"
.IX Header "Supported Formats"
GIF87a and GIF89a headers are supported. The Image block (x2C) is supported.
.PP
The Graphic Control Extension block (x21 + xF9) is supported for transparency 
control. Animation is not supported.
.PP
The Comment Extension block (x21 + xFE), Plain Text Extension block (x21 + x01),
and Application Extension block (x21 + xFF) are read, but ignored. Any other
block or Extension block will be flagged as an error.
.PP
If given, Local Color Tables are read and used, supposedly permitting more 
than 256 colors to be used overall in the image (despite the 8 bit color table
depth).
.PP
A fairly thorough description of the \s-1GIF\s0 format may be found in 
<http://giflib.sourceforge.net/whatsinagif/bits_and_bytes.html>.
.SS "Options"
.IX Subsection "Options"
.IP "\-notrans" 4
.IX Item "-notrans"
When defined and not 0, \f(CW\*(C`\-notrans\*(C'\fR suppresses the use of transparency if such
is defined in the \s-1GIF\s0 file.
.IP "\-multi" 4
.IX Item "-multi"
When defined and not 0, \f(CW\*(C`\-multi\*(C'\fR continues processing past the end of the 
first Image Block. The old behavior, which is now the default, is to stop 
processing at the end of the first Image Block.