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Diffstat (limited to 'giftopnm.html')
| -rw-r--r-- | giftopnm.html | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/giftopnm.html b/giftopnm.html index 4e41f607..01f18e3a 100644 --- a/giftopnm.html +++ b/giftopnm.html @@ -53,18 +53,19 @@ Netpbm output image has the wrong aspect ratio. In this case, <DT><B>--alphaout=</B><I>alpha-filename</I> <DD><B>giftopnm </B> creates a PBM file containing the transparency -information from the input image. This "alpha image" is the same -dimensions as the input image, and each pixel of the alpha image tells whether -the corresponding pixel of the input image is transparent. Black means -transparent; white means opaque. If you don't specify <B>--alphaout</B>, -<B>giftopnm</B> does not generate an alpha file, and if the input image has an -alpha channel, <B>giftopnm</B> simply discards it. +information from the input image. This transparency image is the same +dimensions as the input image, and each pixel of the transparency image tells +whether the corresponding pixel of the input image is transparent. Black +means transparent; white means opaque. If you don't +specify <B>--alphaout</B>, <B>giftopnm</B> does not generate a transparency +file, and if the input image has a transparency channel, <B>giftopnm</B> simply +discards it. <P>If you specify <B>-</B> as the filename, <B>giftopnm</B> writes the -alpha output to Standard Output and discards the image. +transparency output to Standard Output and discards the image. <P>See <B><A HREF="pamcomp.html">pamcomp</A></B> for one way to use -the alpha output file. +the transparency output file. <DT><B>-verbose</B> |