Hello, Brian,
No, I think you covered the bases. Additionally, the attached PDF should illustrate sufficiently the detriments of subsampling to anaglyph images.
Cheers,
Matthew
--- On Thu, 5/7/09, Brian Wallace <Starg82343(-at-)hotmail.com> wrote:
From: Brian Wallace <Starg82343(-at-)hotmail.com>
Subject: Re: [Anaglyphs] Re File size - Marshall, Frans
To: anaglyphs(-at-)yahoogroups.com
Date: Thursday, May 7, 2009, 11:33 PM
Hi Frans,
Many in this group have always advised against resampling anaglyphs, I think because of the two images combined instead of 1 image and the overlapping channels. Also, even small differences between the L & R images could cause problems since the resampling method guesses what color pixel to "fill in" judging by the pixels adjacent to it. This guessing game may not be the same between two images, especially overlapping each other. Am I missing something?
Thanks,
Brian
----- Original Message -----
Sent: Friday, May 08, 2009 1:34 AM
Subject: [Anaglyphs] Re File size - Marshall
Maybe more attention to efficiency is the answer?
The added jp2 file has the same quality as the most recent anaglyph I
uploaded but is four times smaller.
This means 4x faster and 4x less space in the archive.
This is possible by taking advantage of two well known techniques:
- resampling to change pixelsize without quality loss and
- compression without visible artifacts.
So, resized and compressed files are what we should exchange.
At present there are two limitations that may hamper the use of jp2:
1. most browsers need a plugin to view jp2 files
( for example
http://plugindoc. mozdev.org/ windows-all. html#MorganJPEG2 000 for
Mozilla Firefox )
2. I hope the yahoo anaglyph group forwards
jp2 files.
To be safe I add a copy with renamed extention(jpg iso jp2), so you
have to name back to jp2 before viewing.
Knowing Etiennes coding dexterity I don't think the archive will be a
problem.
Of course this is only my point of view.
I hope to learn more from other members.
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