moin2mdwn: convert page Canon_CR2

2 files changed, 50 insertions, 39 deletions

diff --git a/Canon_CR2.mdwn b/Canon_CR2.mdwn
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+
+CR2 files are generated by Canon cameras, starting the 20D, 350D/Digital Rebel Xt and 1D. They supersede the older [[Canon CRW|CRW]]. 
+
+
+# MIME type
+
+image/x-canon-cr2 
+# Organisation
+
+Canon CR2 files are TIFF files. All is organised in a TIFF / IFD file. 
+
+On of the differenciation with the CR2 files is that they have a header before the IFD0. This does not violate the TIFF spec.  
+[[!table header="no" class="mointable" data="""
+ **offset**  |  **length**  |  **description** 
+ 0  |  8  |  TIFF header 
+ 8  |  2  |  litteral 'CR' 
+ 10  |  1  |  major version (2) 
+ 11  |  1  |  minor version (0) 
+ 12  |  4  |  (long) for the offset of the IFD3 that contain the RAW data. (in the TIFF byte order) 
+"""]]
+
+Exif is attached to the ExifIFD of IFD0. The CFA data is in IFD3. 
+
+
+# Compression
+
+Canon CR2 files use the old original [[Lossless_JPEG|Lossless_JPEG]] standard for the RAW data. The same used by [[Adobe DNG|Adobe DNG]]. 
+
+Source: [[http://www.adobeforums.com/cgi-bin/webx/.3bc36454/0|http://www.adobeforums.com/cgi-bin/webx/.3bc36454/0]] (Dead link) 
+
+The width dimension specified in the JPEG stream is actually half the reality because it takes into account 2 channels per sample (the dimension of the CFA pattern). 
+
+350D, 5D and 30D files have a different layout. IFD3 (where the CFA is located) has the tag 0xc640 that contains 3 SHORT. 1, x, y. x is the number of column of the first "slice" of the image, y is for the second "slice".** I don't know what the 1 mean.** 
+
+The slicing means that the output scanlines have to be reorganised as they are shorter to have a top -> bottom then left -> right, a bit like columns of text. (TODO: do a nice diagram) 
+
+
+# Modified files
+
+Apparently Canon's proprietary software modifies the RAW file. Other proprietary software seems to choke on said modified files ([[http://www.prophotohome.com/forum/raw-photo-processing-software-technique/62864-cr2-raws-converted-dpp-wont-open-aperture.html|http://www.prophotohome.com/forum/raw-photo-processing-software-technique/62864-cr2-raws-converted-dpp-wont-open-aperture.html]]). 
+
+[[ExifTool|ExifTool]] has some info: 
+
+* [[http://www.cpanforum.com/threads/1055|http://www.cpanforum.com/threads/1055]] 
+* [[http://www.cpanforum.com/threads/5170|http://www.cpanforum.com/threads/5170]] 
+
+# References
+
+* [[http://lclevy.free.fr/cr2/|http://lclevy.free.fr/cr2/]] 
+* [[http://web.archive.org/web/20061125031802/http://crousseau.free.fr/imgfmt_raw.htm|http://web.archive.org/web/20061125031802/http://crousseau.free.fr/imgfmt_raw.htm]] (in French, by one of the developers of DxO) 
\ No newline at end of file
diff --git a/Canon_CR2.moin b/Canon_CR2.moin
deleted file mode 100644
index 12527f4..0000000
--- a/Canon_CR2.moin
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@@ -1,39 +0,0 @@
-CR2 files are generated by Canon cameras, starting the 20D, 350D/Digital Rebel Xt and 1D. They supersede the older [[CRW|Canon CRW]].

-

-= MIME type =

-image/x-canon-cr2

-= Organisation =

-Canon CR2 files are TIFF files. All is organised in a TIFF / IFD file.

-

-On of the differenciation with the CR2 files is that they have a header before the IFD0. This does not violate the TIFF spec. 

-

-|| '''offset''' || '''length''' || '''description''' ||

-|| 0 || 8 || TIFF header ||

-|| 8 || 2 || litteral 'CR' ||

-|| 10 || 1 || major version (2) ||

-|| 11 || 1 || minor version (0) ||

-|| 12 || 4 || (long) for the offset of the IFD3 that contain the RAW data. (in the TIFF byte order) ||

-

-Exif is attached to the ExifIFD of IFD0. The CFA data is in IFD3.

-

-= Compression =

-Canon CR2 files use the old original [[Lossless_JPEG]] standard for the RAW data. The same used by [[Adobe DNG]].

-

-Source: http://www.adobeforums.com/cgi-bin/webx/.3bc36454/0 (Dead link)

-

-The width dimension specified in the JPEG stream is actually half the reality because it takes into account 2 channels per sample (the dimension of the CFA pattern).

-

-350D, 5D and 30D files have a different layout. IFD3 (where the CFA is located) has the tag 0xc640 that contains 3 SHORT. 1, x, y. x is the number of column of the first "slice" of the image, y is for the second "slice".''' I don't know what the 1 mean.'''

-

-The slicing means that the output scanlines have to be reorganised as they are shorter to have a top -> bottom then left -> right, a bit like columns of text. (TODO: do a nice diagram)

-

-= Modified files =

-Apparently Canon's proprietary software modifies the RAW file. Other proprietary software seems to choke on said modified files (http://www.prophotohome.com/forum/raw-photo-processing-software-technique/62864-cr2-raws-converted-dpp-wont-open-aperture.html).

-

-ExifTool has some info:

- * http://www.cpanforum.com/threads/1055

- * http://www.cpanforum.com/threads/5170

-

-= References =

- * http://lclevy.free.fr/cr2/

- * http://web.archive.org/web/20061125031802/http://crousseau.free.fr/imgfmt_raw.htm (in French, by one of the developers of DxO)