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Received-SPF: None (mx101.skynet.be: no sender authenticity
  information available from domain of
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  envelope-from="SRS0=Xg6B=76=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="tiff-bounces@lists.osgeo.org";
  x-conformance=sidf_compatible
Received-SPF: Pass (mx101.skynet.be: domain of
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  designates 140.211.15.3 as permitted sender)
  identity=mailfrom; client-ip=140.211.15.3;
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  x-sender="SRS0=Xg6B=76=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 mx a:mail.osgeo.org a:lists.osgeo.org
  a:mail.osgeo.osuosl.org ip4:140.211.15.3 a:osgeo7.osgeo.org
  a:trac.osgeo.org a:dev.trac.osgeo.org
  a:secure.osgeo.osuosl.org ip4:140.211.15.57
  ip4:140.211.15.32 ip4:140.211.15.26 ip4:140.211.15.6"
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  client-ip=140.211.15.3; receiver=mx101.skynet.be;
  envelope-from="SRS0=Xg6B=76=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="postmaster@lists.osgeo.org";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text=""
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From: "David C. Partridge" <david.partridge@perdrix.co.uk>
To: "'Sulau'" <sulau@freenet.de>
Cc: <tiff@lists.osgeo.org>
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Subject: Re: [Tiff] TIFF/EP
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Thank you I think I am OK now.  

 

From: Sulau <sulau@freenet.de> 
Sent: 07 April 2023 13:57
To: 'David C. Partridge' <david.partridge@perdrix.co.uk>
Cc: tiff@lists.osgeo.org
Subject: RE: [Tiff] TIFF/EP

 

Hi David,

 

You can find information /specification about the tags at:

               for EXIF:
https://www.cipa.jp/std/documents/download_e.html?DC-008-Translation-2019-E

               for TIFF/EP:         TIFF/EP Specification: Photography -
Electronic still picture imaging - Removable memory - Part 2: Image data
format - TIFF/EP

                                            (look for TAG2000-22 DIS 12234-2
and see at https://en.wikipedia.org/wiki/TIFF/EP )

               for DNG:              Digital Negative (DNG) Specification
Version 1.6.0.0  from Adobe  at
https://helpx.adobe.com/camera-raw/digital-negative.html 

 

Do you still need a sample code for reading/writing those tags with LibTiff?

 

Regards

Su

 

Von: David C. Partridge [mailto:david.partridge@perdrix.co.uk] 
Gesendet: Freitag, 7. April 2023 03:30
An: 'Sulau' <sulau@freenet.de <mailto:sulau@freenet.de> >
Cc: tiff@lists.osgeo.org <mailto:tiff@lists.osgeo.org> 
Betreff: RE: [Tiff] TIFF/EP

 

I found some information after a lot of googling!  I now have some sample
data that makes sense. 

Quick summary: Using data from the definition to the A302 TIFF Tag:

The value consists of:

 

- Two short, being the grid width and height of the repeated pattern.

- Next, for every pixel in that pattern, an identification code.

 

This identification code can be:

 

0 = Red

1 = Green

2 = Blue

3 = Cyan

4 = Magenta

5 = Yellow

6 = White 

 

and now looking at some data extracted from some TIFF files:

TIFF Tag(33421) 0x828d Type(3) ushort(2) ISO CFARepeatPattern: 2 2 

TIFF Tag(33422) 0x828e Type(1) ubyte(4) ISO CFAPattern: 0x00010102

EXIF Tag(41730) 0xa302 Type(7) undef(8) CFAPattern: 0x0002000200010102

It all begins to make sense.

 

Thanks

David

 

From: Sulau <sulau@freenet.de <mailto:sulau@freenet.de> > 
Sent: 06 April 2023 22:24
To: 'David C. Partridge' <david.partridge@perdrix.co.uk
<mailto:david.partridge@perdrix.co.uk> >
Cc: tiff@lists.osgeo.org <mailto:tiff@lists.osgeo.org> 
Subject: RE: [Tiff] TIFF/EP

 

I see. I can try to compile some easy understandable sample code for you to
explain how to write and read those tags using LibTiff.

But I have to take a closer look at the tags myself first. Maybe after
Easter.

I cannot say anything about their "interpretation" (i.e. meaning).  

 

Von: David C. Partridge [mailto:david.partridge@perdrix.co.uk] 
Gesendet: Donnerstag, 6. April 2023 21:36
An: tiff@lists.osgeo.org <mailto:tiff@lists.osgeo.org> 
Cc: 'Sulau' <sulau@freenet.de <mailto:sulau@freenet.de> >
Betreff: RE: [Tiff] TIFF/EP

 

A302 is an EXIF tag with the same name as 828E (CFAPattern).   I know all
three are defined in the source code (grep for CFA).

My concern is sample code to guide me to interpret them correctly.

 

Thanks

David

 

From: Sulau <sulau@freenet.de <mailto:sulau@freenet.de> > 
Sent: 06 April 2023 19:58
To: 'David C. Partridge' <david.partridge@perdrix.co.uk
<mailto:david.partridge@perdrix.co.uk> >
Cc: tiff@lists.osgeo.org <mailto:tiff@lists.osgeo.org> 
Subject: RE: [Tiff] TIFF/EP

 

Dear David,

 

there is an initial merge request (see
https://gitlab.com/libtiff/libtiff/-/merge_requests/337).

However, there are some issues at this stage. I was preparing an improvement
at the time. I could update it and then upload it to my repository. From
there you could get it and try it. Would that help?

 

CFARepeatPatternDim (828D) and CFAPattern (828E) are define, but what is the
tag-definition of A302?

 

Regards,

Su

 

Von: Tiff [mailto:tiff-bounces@lists.osgeo.org] Im Auftrag von David C.
Partridge
Gesendet: Donnerstag, 6. April 2023 14:39
An: tiff@lists.osgeo.org <mailto:tiff@lists.osgeo.org> 
Betreff: [Tiff] TIFF/EP

 

Is there any support in 4.5.0 for TIFF/EP?

Does anyone know of any sample code that reads/processes/writes (e.g.)
CFARepeatPatternDim (828E) and CFAPattern (828E or possible A302).

 

Thanks

David 

 


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB =
link=3D"#0563C1" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>Thank you I think I am OK =
now.&nbsp; <o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'>From:</span></b><=
span lang=3DEN-US =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'> Sulau =
&lt;sulau@freenet.de&gt; <br><b>Sent:</b> 07 April 2023 =
13:57<br><b>To:</b> 'David C. Partridge' =
&lt;david.partridge@perdrix.co.uk&gt;<br><b>Cc:</b> =
tiff@lists.osgeo.org<br><b>Subject:</b> RE: [Tiff] =
TIFF/EP<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Hi David,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>You can find information =
/specification about the tags at:<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for =
EXIF:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; <a =
href=3D"https://www.cipa.jp/std/documents/download_e.html?DC-008-Translat=
ion-2019-E">https://www.cipa.jp/std/documents/download_e.html?DC-008-Tran=
slation-2019-E</a><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for =
TIFF/EP:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TIFF/EP =
Specification: Photography &#8212; Electronic still picture imaging =
&#8212; Removable memory &#8212; Part 2: Image data format &#8212; =
TIFF/EP<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (look =
for TAG2000-22 DIS 12234-2 and see at <a =
href=3D"https://en.wikipedia.org/wiki/TIFF/EP">https://en.wikipedia.org/w=
iki/TIFF/EP</a> )<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for =
DNG:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; Digital Negative (DNG) Specification&nbsp; Version =
1.6.0.0&nbsp; from Adobe&nbsp; at&nbsp; <a =
href=3D"https://helpx.adobe.com/camera-raw/digital-negative.html">https:/=
/helpx.adobe.com/camera-raw/digital-negative.html</a> =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Do you still need a =
sample code for reading/writing those tags with =
LibTiff?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Regards<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Su<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE =
style=3D'mso-ligatures:none;mso-fareast-language:DE'>Von:</span></b><span=
 lang=3DDE style=3D'mso-ligatures:none;mso-fareast-language:DE'> David =
C. Partridge [<a =
href=3D"mailto:david.partridge@perdrix.co.uk">mailto:david.partridge@perd=
rix.co.uk</a>] <br><b>Gesendet:</b> Freitag, 7. April 2023 =
03:30<br><b>An:</b> 'Sulau' &lt;<a =
href=3D"mailto:sulau@freenet.de">sulau@freenet.de</a>&gt;<br><b>Cc:</b> =
<a =
href=3D"mailto:tiff@lists.osgeo.org">tiff@lists.osgeo.org</a><br><b>Betre=
ff:</b> RE: [Tiff] TIFF/EP<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span lang=3DDE><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'>I found some =
information after a lot of googling!&nbsp; I now have some sample data =
that makes sense. <br><br>Quick summary: Using data from the definition =
to the A302 TIFF Tag:<o:p></o:p></p><p class=3DMsoNormal>The value =
consists of:<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>- Two short, being the grid width and height of the =
repeated pattern.<o:p></o:p></p><p class=3DMsoNormal>- Next, for every =
pixel in that pattern, an identification code.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>This =
identification code can be:<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>0 =3D =
Red<o:p></o:p></p><p class=3DMsoNormal>1 =3D Green<o:p></o:p></p><p =
class=3DMsoNormal>2 =3D Blue<o:p></o:p></p><p class=3DMsoNormal>3 =3D =
Cyan<o:p></o:p></p><p class=3DMsoNormal>4 =3D Magenta<o:p></o:p></p><p =
class=3DMsoNormal>5 =3D Yellow<o:p></o:p></p><p class=3DMsoNormal>6 =3D =
White <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>and now looking at some data extracted from some TIFF =
files:<br><br>TIFF Tag(33421) 0x828d Type(3) ushort(2) ISO =
CFARepeatPattern: 2 2 <o:p></o:p></p><p class=3DMsoNormal>TIFF =
Tag(33422) 0x828e Type(1) ubyte(4) ISO CFAPattern: =
0x00010102<o:p></o:p></p><p class=3DMsoNormal>EXIF Tag(41730) 0xa302 =
Type(7) undef(8) CFAPattern: 0x0002000200010102<br><br>It all begins to =
make sense.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thanks<o:p></o:p></p><p =
class=3DMsoNormal>David<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'>From:</span></b><=
span lang=3DEN-US =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'> Sulau &lt;<a =
href=3D"mailto:sulau@freenet.de">sulau@freenet.de</a>&gt; =
<br><b>Sent:</b> 06 April 2023 22:24<br><b>To:</b> 'David C. Partridge' =
&lt;<a =
href=3D"mailto:david.partridge@perdrix.co.uk">david.partridge@perdrix.co.=
uk</a>&gt;<br><b>Cc:</b> <a =
href=3D"mailto:tiff@lists.osgeo.org">tiff@lists.osgeo.org</a><br><b>Subje=
ct:</b> RE: [Tiff] TIFF/EP<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>I see. I can try to compile some easy =
understandable sample code for you to explain how to write and read =
those tags using LibTiff.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>But I have to take a =
closer look at the tags myself first. Maybe after =
Easter.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>I cannot say anything about their =
&#8220;interpretation&#8221; (i.e. meaning). =
&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE =
style=3D'mso-ligatures:none;mso-fareast-language:DE'>Von:</span></b><span=
 lang=3DDE style=3D'mso-ligatures:none;mso-fareast-language:DE'> David =
C. Partridge [<a =
href=3D"mailto:david.partridge@perdrix.co.uk">mailto:david.partridge@perd=
rix.co.uk</a>] <br><b>Gesendet:</b> Donnerstag, 6. April 2023 =
21:36<br><b>An:</b> <a =
href=3D"mailto:tiff@lists.osgeo.org">tiff@lists.osgeo.org</a><br><b>Cc:</=
b> 'Sulau' &lt;<a =
href=3D"mailto:sulau@freenet.de">sulau@freenet.de</a>&gt;<br><b>Betreff:<=
/b> RE: [Tiff] TIFF/EP<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span lang=3DDE><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal>A302 is an EXIF tag with the same name as 828E =
(CFAPattern).&nbsp;&nbsp; I know all three are defined in the source =
code (grep for CFA).<br><br>My concern is sample code to guide me to =
interpret them correctly.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thanks<o:p></o:p></p><p =
class=3DMsoNormal>David<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'>From:</span></b><=
span lang=3DEN-US =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'> Sulau &lt;<a =
href=3D"mailto:sulau@freenet.de">sulau@freenet.de</a>&gt; =
<br><b>Sent:</b> 06 April 2023 19:58<br><b>To:</b> 'David C. Partridge' =
&lt;<a =
href=3D"mailto:david.partridge@perdrix.co.uk">david.partridge@perdrix.co.=
uk</a>&gt;<br><b>Cc:</b> <a =
href=3D"mailto:tiff@lists.osgeo.org">tiff@lists.osgeo.org</a><br><b>Subje=
ct:</b> RE: [Tiff] TIFF/EP<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DDE style=3D'color:#1F497D'>Dear David,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DDE =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>there is an initial =
merge request (see <a =
href=3D"https://gitlab.com/libtiff/libtiff/-/merge_requests/337">https://=
gitlab.com/libtiff/libtiff/-/merge_requests/337</a>).<o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'color:#1F497D'>However, there are =
some issues at this stage.</span> <span style=3D'color:#1F497D'>I was =
preparing an improvement at the time. I could update it and then upload =
it to my repository. From there you could get it and try it. Would that =
help?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>CFARepeatPatternDim =
(828D) and CFAPattern (828E) are define, but what is the tag-definition =
of A302?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Regards,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Su<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE =
style=3D'mso-ligatures:none;mso-fareast-language:DE'>Von:</span></b><span=
 lang=3DDE style=3D'mso-ligatures:none;mso-fareast-language:DE'> Tiff =
[<a =
href=3D"mailto:tiff-bounces@lists.osgeo.org">mailto:tiff-bounces@lists.os=
geo.org</a>] <b>Im Auftrag von </b>David C. =
Partridge<br><b>Gesendet:</b> Donnerstag, 6. April 2023 =
14:39<br><b>An:</b> <a =
href=3D"mailto:tiff@lists.osgeo.org">tiff@lists.osgeo.org</a><br><b>Betre=
ff:</b> [Tiff] TIFF/EP<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span lang=3DDE><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal>Is there any support in 4.5.0 for TIFF/EP?<br><br>Does =
anyone know of any sample code that reads/processes/writes (e.g.) =
CFARepeatPatternDim (828E) and CFAPattern (828E or possible =
A302).<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thanks<o:p></o:p></p><p class=3DMsoNormal>David<span =
style=3D'mso-ligatures:none;mso-fareast-language:EN-GB'> =
<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></body></html>
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