NAME

PDF::Builder::Resource::XObject::Image::GIF - support routines for GIF image library. Inherits from PDF::Builder::Resource::XObject::Image

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).

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

Options

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