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NAME

PDF::Builder::Resource::XObject::Image::GIF - Support routines for GIF image library

Inherits from PDF::Builder::Resource::XObject::Image

History

GIF89a Specification: https://www.w3.org/Graphics/GIF/spec-gif89a.txt

A fairly thorough description of the GIF format may be found in http://giflib.sourceforge.net/whatsinagif/bits_and_bytes.html.

Code originally from PDF::Create, PDF::Image::GIFImage - GIF image support Author: Michael Gross <mdgrosse@sboxtugraz.at>

Supported Formats

GIF87a and GIF89a headers are supported. The Image block (x2C) is supported.

The Graphic Control Extension block (x21 + xF9) is supported for transparency control. Animation is not supported.

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.

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).

Options

notrans

When defined and not 0, notrans suppresses the use of transparency if such is defined in the GIF file.

name => 'string'

This is the name you can give for the GIF image object. The default is Gxnnnn.

multi

When defined and not 0, multi 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.

METHODS

new

     PDF::Builder::Resource::XObject::Image::GIF->new()
Create an image object from a GIF input file. Remember that this should be invoked via the Builder.pm method!

NAVIGATION LINKS

Up (Parents)

Master Index
PDF::Builder -- Facilitates the creation and modification of PDF files
PDF::Builder::Resource -- Base class for PDF resources
PDF::Builder::Resource::XObject -- Base class for external objects
PDF::Builder::Resource::XObject::Image -- Base class for external raster image objects

Siblings

PDF::Builder::Resource::XObject::Image::GD -- Support routines for Graphics Development image library
PDF::Builder::Resource::XObject::Image::JPEG -- Support routines for JPEG image library
PDF::Builder::Resource::XObject::Image::PNG -- Support routines for PNG image library (using pure Perl code)
PDF::Builder::Resource::XObject::Image::PNG_IPL -- Support routines for PNG image library (using Image::PNG::Libpng)
PDF::Builder::Resource::XObject::Image::PNM -- Support routines for PNM (Portable aNy Map) image library
PDF::Builder::Resource::XObject::Image::TIFF -- TIFF image support
PDF::Builder::Resource::XObject::Image::TIFF_GT -- TIFF image support (Graphics::TIFF enabled)

 

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Last updated Sat, 09 Dec 2023 at 10:59 PM

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Fri, 24 May 2024 at 3:29 AM EDT