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| author | William Joye <wjoye@cfa.harvard.edu> | 2017-01-03 21:52:18 (GMT) |
|---|---|---|
| committer | William Joye <wjoye@cfa.harvard.edu> | 2017-01-03 21:52:18 (GMT) |
| commit | 4302a869f0212a3e4878e66a7260b434f6584476 (patch) | |
| tree | e6976e66edf648406e32b092395121e045301692 /tkimg/doc/img-gif.man | |
| parent | a780057cc1b51dd3a557549c3cf2431f09136c0d (diff) | |
| parent | 60d692811c12788ed4468d5ff680633304e8f641 (diff) | |
| download | blt-4302a869f0212a3e4878e66a7260b434f6584476.zip blt-4302a869f0212a3e4878e66a7260b434f6584476.tar.gz blt-4302a869f0212a3e4878e66a7260b434f6584476.tar.bz2 | |
Merge commit '60d692811c12788ed4468d5ff680633304e8f641' as 'tkimg'
Diffstat (limited to 'tkimg/doc/img-gif.man')
| -rwxr-xr-x | tkimg/doc/img-gif.man | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/tkimg/doc/img-gif.man b/tkimg/doc/img-gif.man new file mode 100755 index 0000000..e276b15 --- /dev/null +++ b/tkimg/doc/img-gif.man @@ -0,0 +1,65 @@ +[comment {-*- tcl -*- doctools}]
+[vset FORMATNAME gif]
+[vset FORMATFULLNAME {Graphics Interchange Format}]
+
+[include format-header.inc]
+
+This handler provides new additional configuration options. See
+section [sectref {GIF OPTIONS}] for more detailed explanations.
+
+
+[include format-middle.inc]
+
+
+In addition the value for the option is treated as list and may
+contain any of the special options listed in section
+
+[sectref {GIF OPTIONS}].
+
+[list_end]
+
+
+
+[section {GIF OPTIONS}]
+
+The handler provides two options, one for reading from a GIF image,
+the other influencing the writing of such.
+
+[list_begin definitions]
+
+[lst_item "[option -index] [arg n]"]
+
+This option is for reading from GIF files containing more than one
+image ([term {animated GIF's}], [term {GIF movies}]. When specified it
+will read the [arg n]'th image in the data. The first image is at
+index [const 0] and will be read by default, i.e. when the option is
+not specified.
+
+[lst_item "[option -interlaced] [arg bool]"]
+
+If the value of this option is set to true the image will be written
+using the interlaced sub-format of GIF. The default is to write
+non-interlaced files. [emph {This option is not implemented yet.}]
+
+[list_end]
+
+[section {IMAGE COMPRESSION}]
+
+Instead of LZW the run-length encoding of Hutchison Avenue Software
+Corporation is used, also known as [term miGIF] compression. The miGIF
+compression routines do not, strictly speaking, generate files
+conforming to the GIF spec, since the image data is not LZW-compressed
+(this is the point: in order to avoid transgression of the Unisys
+patent on the LZW algorithm.) However, miGIF generates data streams
+that any reasonably sane LZW decompresser will decompress to what we
+want.
+
+[section TRANSPARENCY]
+
+If you want to write images to disk which contain transparency
+information (e.g. GIF89) you need at least [package Tk] 8.3.
+
+
+
+[list_begin definitions]
+[include format-footer.inc]
|