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In-Reply-To: <D44F69A9.3DCEC%kemp@objectivepathology.com>
References: <D44F69A9.3DCEC%kemp@objectivepathology.com>
From: Dmitry Fedorov <dima@dimin.net>
Date: Mon, 14 Nov 2016 11:55:17 -0700
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Message-ID: <CAERMcmQNEo72Jbz_QhjXqbttda7DCGx+9RdW=EhYmX6kGpqmrQ@mail.gmail.com>
To: Kemp Watson <kemp@objectivepathology.com>
Cc: TIFF <Tiff@lists.maptools.org>
Subject: Re: [Tiff] Right way to make a multi-resolution pyramid
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Hi Kemp,

I personally prefer the Photoshop way using SUBIFD with properly
set SUBFILETYPE within the reduced resolution subifd. This way normal ifds
will be interpreted well by readers not understanding the pyramid and one
could store Z or T slices without worries. At the same time most readers
that do understand pyramids and tiles (OpenSlide or Photoshop for example)
will read those sub-ifds.

-dmitry


On Mon, Nov 14, 2016 at 11:16 AM, Kemp Watson <kemp@objectivepathology.com>
wrote:

> Hi all:
>
> What is the =E2=80=9Ccorrect=E2=80=9D or canonical way to make a (tiled) =
multi-resolution
> pyramid in TIFF?
>
> Most implementations I=E2=80=99ve seen simply chain top-level IFDs togeth=
er,
> starting with the base or full-res layer, and going smaller from there to
> the apex. this seems wrong to me.
>
> The description of the SubIFD tag indicates it should be used for
> reduced-resolution images. To make matters more complex, the NewSubfileTy=
pe
> tag, which appears to be a different =E2=80=9Csub-file=E2=80=9D type than=
 a SubIFD, since
> it can be used for top-level pages/images, also indicates a value for a
> reduced-resolution image.
>
> And, if a SubIFD is used, should it point to a chain of IFDs at the secon=
d
> level, or to an image with a SubIFD pointing to an image, ongoing
> recursively (which appears to me most correct, but most complex)?
>
>
> *W. Kemp Watson*
> *kemp@objectivepathology.com <kemp@objectivepathology.com>*
>
>
> *Objective Pathology Services Limited*
> www.objectivepathology.com
> tel. +1 (416) 970-7284
>
>
> _______________________________________________
> Tiff mailing list: Tiff@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/tiff
> http://www.remotesensing.org/libtiff/
>



--=20
__________________________________

Dmitry Fedorov Levit <dima@dimin.net>
Web: http://www.dimin.net/
__________________________________

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<div dir=3D"ltr">Hi Kemp,<div><br></div><div>I personally prefer the Photos=
hop way using=C2=A0SUBIFD with properly set=C2=A0SUBFILETYPE within the red=
uced resolution subifd. This way normal ifds will be interpreted well by re=
aders not understanding the pyramid and one could store Z or T slices witho=
ut worries. At the same time most readers that do understand pyramids and t=
iles (OpenSlide or Photoshop for example) will read those sub-ifds.</div><d=
iv><br></div><div>-dmitry</div><div><br></div></div><div class=3D"gmail_ext=
ra"><br><div class=3D"gmail_quote">On Mon, Nov 14, 2016 at 11:16 AM, Kemp W=
atson <span dir=3D"ltr">&lt;<a href=3D"mailto:kemp@objectivepathology.com" =
target=3D"_blank">kemp@objectivepathology.com</a>&gt;</span> wrote:<br><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c=
cc solid;padding-left:1ex"><div style=3D"word-wrap:break-word;color:rgb(0,0=
,0);font-size:14px;font-family:Calibri,sans-serif"><div><div><div>Hi all:</=
div><div><br></div><div>What is the =E2=80=9Ccorrect=E2=80=9D or canonical =
way to make a (tiled) multi-resolution pyramid in TIFF?</div><div><br></div=
><div>Most implementations I=E2=80=99ve seen simply chain top-level IFDs to=
gether, starting with the base or full-res layer, and going smaller from th=
ere to the apex. this seems wrong to me.</div><div><br></div><div>The descr=
iption of the SubIFD tag indicates it should be used for reduced-resolution=
 images. To make matters more complex, the NewSubfileType tag, which appear=
s to be a different =E2=80=9Csub-file=E2=80=9D type than a SubIFD, since it=
 can be used for top-level pages/images, also indicates a value for a reduc=
ed-resolution image.</div><div><br></div><div>And, if a SubIFD is used, sho=
uld it point to a chain of IFDs at the second level, or to an image with a =
SubIFD pointing to an image, ongoing recursively (which appears to me most =
correct, but most complex)?</div><div><div><br></div><div><div><b style=3D"=
font-size:medium;font-family:&#39;Myriad Pro&#39;"><span style=3D"font-fami=
ly:Calibri"><font class=3D"m_-2837088869412782184Apple-style-span" color=3D=
"#1188ff">W. Kemp Watson<br></font></span></b></div><div><b style=3D"font-s=
ize:medium;font-family:&#39;Myriad Pro&#39;"><span style=3D"font-family:Cal=
ibri"><font class=3D"m_-2837088869412782184Apple-style-span" color=3D"#1188=
ff"><a href=3D"mailto:kemp@objectivepathology.com" target=3D"_blank">kemp@o=
bjectivepathology.com</a></font></span></b></div></div><div><br></div><div>=
<img src=3D"cid:71FA2EF8-85BD-4300-8B68-8197D558237C" type=3D"image/png"></=
div><div><br></div><div><div><b style=3D"font-size:medium;font-family:&#39;=
Myriad Pro&#39;"><span style=3D"font-family:Calibri"><font class=3D"m_-2837=
088869412782184Apple-style-span" color=3D"#1188ff">Objective Pathology Serv=
ices Limited</font></span></b></div><div><span class=3D"m_-2837088869412782=
184Apple-style-span" style=3D"font-family:Calibri;font-size:13px"><a href=
=3D"http://www.objectivepathology.com" target=3D"_blank">www.objectivepatho=
logy.com</a><br>tel. <a href=3D"tel:%2B1%20%28416%29%20970-7284" value=3D"+=
14169707284" target=3D"_blank">+1 (416) 970-7284</a><br><br></span></div><d=
iv><p></p></div></div></div></div></div></div>
<br>______________________________<wbr>_________________<br>
Tiff mailing list: <a href=3D"mailto:Tiff@lists.maptools.org">Tiff@lists.ma=
ptools.org</a><br>
<a href=3D"http://lists.maptools.org/mailman/listinfo/tiff" rel=3D"noreferr=
er" target=3D"_blank">http://lists.maptools.org/<wbr>mailman/listinfo/tiff<=
/a><br>
<a href=3D"http://www.remotesensing.org/libtiff/" rel=3D"noreferrer" target=
=3D"_blank">http://www.remotesensing.org/<wbr>libtiff/</a><br></blockquote>=
</div><br><br clear=3D"all"><div><br></div>-- <br><div class=3D"gmail_signa=
ture" data-smartmail=3D"gmail_signature">__________________________________=
<br><br>Dmitry Fedorov Levit &lt;<a href=3D"mailto:dima@dimin.net" target=
=3D"_blank">dima@dimin.net</a>&gt;<br>Web: <a href=3D"http://www.dimin.net/=
" target=3D"_blank">http://www.dimin.net/</a><br>__________________________=
________</div>
</div>

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