From: "Steve Simon" <steve@quintile.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] shrinking an Image?
Date: Mon, 28 Aug 2006 23:17:33 +0100 [thread overview]
Message-ID: <c64f0af16da74a404aea9557eb123c85@quintile.net> (raw)
In-Reply-To: <d0a044e00bbf15ec356cf6c6329a77f1@proxima.alt.za>
> I find that resample(1) is not visually as faithful as (even?)
> page(1)'s built-in resizer. I have not explored the possible causes,
> however. For JPEG and 2, 4, 8 times resizing (shrinking) I find the
> cjpeg | djpeg combination to be preferable.
Just a guess, but prehaps page does resample in screen space
(e.g. 16bpp) whereas resample(1) probably runs faithfully in YUV
(well, more likely RGB) space. This could easily have the effect of
amplifying the JPEG compression artiacts. Resampling in the incorrect
gamma land can also have strange effects like this.
-Steve
next prev parent reply other threads:[~2006-08-28 22:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-26 21:13 Axel Belinfante
2006-08-26 21:21 ` andrey mirtchovski
2006-08-27 7:51 ` lucio
2006-08-27 14:37 ` Russ Cox
2006-08-27 16:45 ` lucio
2006-08-27 15:09 ` erik quanstrom
2006-08-27 16:46 ` lucio
2006-08-27 17:34 ` Axel Belinfante
2006-08-27 17:46 ` andrey mirtchovski
2006-08-27 18:22 ` erik quanstrom
2006-08-28 22:17 ` Steve Simon [this message]
2006-08-28 23:07 ` erik quanstrom
2006-08-27 17:20 ` Axel Belinfante
2006-08-26 21:22 ` Federico Benavento
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