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In-Reply-To: <CAGNS0RuBBn3h1X5CxwMM0kq_XeGAu-AWo9wxC51UYgFcmB-X0Q@mail.gmail.com>
Date: Mon, 4 Apr 2022 11:06:53 -0400
Message-ID: <CACp925SmcjMBES2rTpVRKyrcwipt5FEdNySqyzGhPog7q7n_Nw@mail.gmail.com>
To: jcupitt@gmail.com
Subject: Re: [Tiff] JPEG2000 support
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From: Kemp Watson via Tiff <tiff@lists.osgeo.org>
Reply-To: Kemp Watson <kemp@objectivepathology.com>
Cc: "tiff@lists.osgeo.org" <tiff@lists.osgeo.org>
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It's indeed used in slide imaging fairly commonly, but with
"non-conforming" TIFFtags (33003 and 33005 instead of 34712), and
essentially to Leonard's point... why?
It's a historical artifact from 20-year-old CPUs: the tradeoff here is
essentially a Gaussian pyramid for speed vs a Laplacian pyramid for
compression.

JPEG 2000 pyramid support is actually quite fabulous, to the point of
"pyramidal is what JPEG 2000 is, all the way through".
 Its browser compatibility is quite a bit less so...

Kemp Watson

On Mon, Apr 4, 2022 at 10:30 AM <jcupitt@gmail.com> wrote:

> Tiled pyramidal TIFF, with jp2k compression for tiles, is quite
> commonly used for slide imaging.
>
> jp2k format pyramid support is not great, unfortunately.
>
>
> On Mon, 4 Apr 2022 at 14:00, Leonard Rosenthol via Tiff
> <tiff@lists.osgeo.org> wrote:
> >
> > Just out of curiosity, why would you want to do that?
> >
> >
> >
> > JPEG2000 offers it own, ISO standardized, image file format container.
> What is the benefit of putting JP2K compression into TIFF?   Are you
> thinking about the lossy or lossless options?
> >
> >
> >
> > Leonard
> >
> >
> >
> > From: Tiff <tiff-bounces@lists.osgeo.org> on behalf of miguel medalha <
> medalist@sapo.pt>
> > Date: Friday, April 1, 2022 at 2:35 PM
> > To: tiff@lists.osgeo.org <tiff@lists.osgeo.org>
> > Subject: [Tiff] JPEG2000 support
> >
> > Hello
> >
> > Are there any plans to include JPEG2000 compression (OpenJPEG, for
> example)?
> >
> > Thank you.
> >
> >
> > _______________________________________________
> > Tiff mailing list
> > Tiff@lists.osgeo.org
> >
> https://nam04.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flists=
.osgeo.org%2Fmailman%2Flistinfo%2Ftiff&amp;data=3D04%7C01%7Clrosenth%40adob=
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<div dir=3D"ltr">It&#39;s indeed used in slide imaging fairly commonly, but=
 with &quot;non-conforming&quot; TIFFtags (33003 and 33005 instead of 34712=
), and essentially to Leonard&#39;s point... why?<div>It&#39;s a historical=
 artifact from 20-year-old CPUs: the tradeoff here is essentially a Gaussia=
n pyramid for speed vs a Laplacian pyramid for compression.</div><div><br><=
/div><div>JPEG 2000 pyramid support is actually quite fabulous, to the poin=
t of &quot;pyramidal is what JPEG 2000 is, all the way through&quot;.</div>=
<div>=C2=A0Its browser compatibility is quite a bit less so...</div><div><b=
r></div><div>Kemp Watson</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Mon, Apr 4, 2022 at 10:30 AM &lt;<a href=
=3D"mailto:jcupitt@gmail.com" target=3D"_blank">jcupitt@gmail.com</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Tiled pyra=
midal TIFF, with jp2k compression for tiles, is quite<br>
commonly used for slide imaging.<br>
<br>
jp2k format pyramid support is not great, unfortunately.<br>
<br>
<br>
On Mon, 4 Apr 2022 at 14:00, Leonard Rosenthol via Tiff<br>
&lt;<a href=3D"mailto:tiff@lists.osgeo.org" target=3D"_blank">tiff@lists.os=
geo.org</a>&gt; wrote:<br>
&gt;<br>
&gt; Just out of curiosity, why would you want to do that?<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; JPEG2000 offers it own, ISO standardized, image file format container.=
=C2=A0 What is the benefit of putting JP2K compression into TIFF?=C2=A0 =C2=
=A0Are you thinking about the lossy or lossless options?<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; Leonard<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; From: Tiff &lt;<a href=3D"mailto:tiff-bounces@lists.osgeo.org" target=
=3D"_blank">tiff-bounces@lists.osgeo.org</a>&gt; on behalf of miguel medalh=
a &lt;<a href=3D"mailto:medalist@sapo.pt" target=3D"_blank">medalist@sapo.p=
t</a>&gt;<br>
&gt; Date: Friday, April 1, 2022 at 2:35 PM<br>
&gt; To: <a href=3D"mailto:tiff@lists.osgeo.org" target=3D"_blank">tiff@lis=
ts.osgeo.org</a> &lt;<a href=3D"mailto:tiff@lists.osgeo.org" target=3D"_bla=
nk">tiff@lists.osgeo.org</a>&gt;<br>
&gt; Subject: [Tiff] JPEG2000 support<br>
&gt;<br>
&gt; Hello<br>
&gt;<br>
&gt; Are there any plans to include JPEG2000 compression (OpenJPEG, for exa=
mple)?<br>
&gt;<br>
&gt; Thank you.<br>
&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Tiff mailing list<br>
&gt; <a href=3D"mailto:Tiff@lists.osgeo.org" target=3D"_blank">Tiff@lists.o=
sgeo.org</a><br>
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WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;=
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08da140e5427%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C63784434917127491=
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&gt;<br>
&gt; _______________________________________________<br>
&gt; Tiff mailing list<br>
&gt; <a href=3D"mailto:Tiff@lists.osgeo.org" target=3D"_blank">Tiff@lists.o=
sgeo.org</a><br>
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errer" target=3D"_blank">https://lists.osgeo.org/mailman/listinfo/tiff</a><=
br>
_______________________________________________<br>
Tiff mailing list<br>
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" target=3D"_blank">https://lists.osgeo.org/mailman/listinfo/tiff</a><br>
</blockquote></div>

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