From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] radar for plan 9, and two draw funnies.
Date: Sat, 12 Dec 2009 15:00:49 -0500 [thread overview]
Message-ID: <94e0e78e118b2061dfbc997c199f14f6@ladd.quanstro.net> (raw)
In-Reply-To: <<20091212144519.GA2904@zoidberg.hsd1.mi.comcast.net>>
> On Fri, Dec 11, 2009 at 08:51:21PM -0500, erik quanstrom wrote:
> > 1. for some reason the hw.gif (interstates) are
> > in cyan not red. drawing the radar first and the
> > hw second yields inverse radar colors.
> In what order are you layering the images? According to [1] they are layered
> left to right as on the toggle bar.
>
> [1]http://www.srh.noaa.gov/jetstream/doppler/ridge_download.htm
i think that's beside the point here. the colors get inverted regardless
of the order of composition. try compose -t topo.jpg radar.gif hw.gif.
(this is the same order as on the site). in this case the radar image has
the wrong colors.
it looks like an α² problem, but i don't think it is. if you use an r8g8b8
base image, the color effects still happen. m8a8 yields black. i didn't
know that was legal, yet:
; gif -9 radar.gif|dd -count 1 -bs 50>[2=]; echo
m8a8 0 0 600 ;
it's especially odd to try these two:
; compose -c m8 -t topo.jpg radar.gif hw.gif
; compose -c m8 -t topo.jpg hw.gif radar.gif
- erik
next parent reply other threads:[~2009-12-12 20:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <<20091212144519.GA2904@zoidberg.hsd1.mi.comcast.net>
2009-12-12 20:00 ` erik quanstrom [this message]
[not found] <<dd6fe68a0912120745w38f491a5y65da039556f936ab@mail.gmail.com>
2009-12-12 16:09 ` erik quanstrom
2009-12-12 18:57 ` Russ Cox
[not found] <<dd6fe68a0912120655q18c8e3f3pd056284626b0ae4f@mail.gmail.com>
2009-12-12 15:25 ` erik quanstrom
2009-12-12 15:45 ` Russ Cox
2009-12-12 1:51 erik quanstrom
2009-12-12 14:45 ` Jacob Todd
2009-12-12 14:55 ` Russ Cox
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