Re: [9fans] resample(1) 1 and fancy graphics tools 0

Re: [9fans] resample(1) 1 and fancy graphics tools 0

[erik quanstrom]

On Fri Oct 16 15:47:15 EDT 2009, steve@quintile.net wrote:
> An example makes things clear - appologies for the poor quality of
> the joke.
>
> http://www.quintile.net/doorstep/broken-animated-image.gif

that's essentially the same problem as with the page
i posted.  except the images are presented as seperate
gifs rather than an animation.

- erik

Re: [9fans] resample(1) 1 and fancy graphics tools 0

[Steve Simon]

If anyone does fancy working on gif(1) it has a bug I have been meaning to look
at for ages.

The problem relates to reproducing optimised animated gif files.
Gif(1) assumes each image in an animation should be rendered on a
black background, however optimised animations, those which contain
only the interframe differences WRT the reference (first) frame do
not conform to this model.

An example makes things clear - appologies for the poor quality of
the joke.

http://www.quintile.net/doorstep/broken-animated-image.gif

-Steve

[9fans] resample(1) 1 and fancy graphics tools 0

[erik quanstrom]

the comment in resample's man page is really true.
it produces great output s-l-o-w-l-y.

i needed to convert some pic(1)tures to transparent gifs.
unfortunately gif(1) doesn't do that.  so i took a snapshot
of the page window with
	crop -i5 /mnt/wsys/$id/window | topng > $target
and fed the results to gimp.  unfortunately, this failed
miserably.  some of the lines were aliased by gs and gimp
got confused.  i tried feeding an image 10x larger into gimp
and resizing, but the results were even worse!  half the lines
were deleted.

resize to the rescue.  i tried this and the results are much,
much better (available for pickup next wed :-)):
	<$pdf gs -dNOPAUSE -dSAFER '-sDEVICE=plan9' \
		'-sOutputFile=/fd/1' -dQUIET -r1000 \
		'-dTextAlphaBits=4' '-dGraphicsAlphaBits=4' -|
		resample -x10%|page

btw, is anyone working or thinking about working on gif?  it
really does need to transparency right to handle stuff like
	http://radar.weather.gov/ridge/radar.php?rid=ffc
i looked at it a while back for 5 minutes but wasn't quite
clear on the concept and had other things to do.

- erik