| Summary: | digikam,exif rotation, thumbnail not rotated | ||
|---|---|---|---|
| Product: | [Applications] digikam | Reporter: | Philippe ROUBACH <philippe.roubach> |
| Component: | Thumbs-Image | Assignee: | Digikam Developers <digikam-bugs-null> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | ahuggel, marcel.wiesweg |
| Priority: | NOR | ||
| Version: | 1.0.0 | ||
| Target Milestone: | --- | ||
| Platform: | unspecified | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | 1.0.0 | |
| Sentry Crash Report: | |||
| Attachments: | picture to test | ||
|
Description
Philippe ROUBACH
2009-07-15 20:51:56 UTC
Andreas, I CC your for some info here. My problem is which orientation flag is taken into account for the Exif or the Iptc preview. 1) From the spec it seems there is an optional Exif.Thumbnail.Orientation which determines the rotation of the Exif thumbnail. 2) If there is no Exif.Thumbnail.Orientation, the Exif thumbnail need not be rotated according to Exif.Image.Orientation? 3) If I change the Exif.Image.Orientation, do I need to change the Exif.Thumbnail.Orientation or even rotate the thumbnail image data? 4) Does the Exif.Image.Orientation affect the Iptc.Application2.Preview image? 5) So when I change the Exif.Image.Orientation, do I need to do anything about the IPTC preview? Rotate the actual image data? Thanks! Hi Marcel, For 1), 2) and 3), I suggest to follow the "Guidelines For Handling Image Metadata" from the Metadata Working Group (http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf page 36) For 4) and 5), in the spirit of the guidelines above, it is good practice to write the IPTC thumbnail Image also in the same orientation as the Primary Image, in my opinion, although the two specs are not related. Andreas Philippe, can you send me a sampe picture to test? I dont find one currently with extra thumnail orientation. SVN commit 1006456 by mwiesweg: If a dedicated orientation flag for the EXIF thumbnail exists adjust it as well. CCBUG: 200357 M +12 -0 kexiv2image.cpp WebSVN link: http://websvn.kde.org/?view=rev&revision=1006456 Philippe, To test Marcel changes, you need to use libkexiv2 from trunk and recompile digiKam against. Gilles Caulier Created attachment 36654 [details] picture to test (In reply to comment #3) > Philippe, can you send me a sampe picture to test? I dont find one currently > with extra thumnail orientation. digikam 1.0.0b4 kipi-plugins 0.5.0 pb still there Test image unchanged: Exif.Image.Orientation Short 1 top, left Exif.Thumbnail.Orientation Short 1 top, left Test image after assigning Exif rotation tag: Exif.Image.Orientation Short 1 left, bottom Exif.Thumbnail.Orientation Short 1 left, bottom Xmp.tiff.Orientation XmpText 1 left, bottom as requested in original report. digikam 1.0.0b5 kipi-plugins 0.7 LibKExiv2: 0.6.0 pb still there this bug must be reopened (i can't) You will see this change only with libkexiv2 versions after SVN revision 1006456. Coming with KDE4.4 packages at least. (In reply to comment #10) > You will see this change only with libkexiv2 versions after SVN revision > 1006456. Coming with KDE4.4 packages at least. i updated my test system now i have kde 4.4b1 (4.3.80) and libkexiv2_8 /usr/lib/libkexiv2.so.8 /usr/lib/libkexiv2.so.8.0.0 is it the libkexiv2 you speak about ? /usr/share/apps/libkexiv2/data/topicset.iptc-subjectcode.xml i made this experiment : assume a landscape photo 3472(x)x2604(y) thus with "top,left" orientation i rotate 90° counterclock with "exif orientation/left rotate" then i see a portrait photo with following data : 3472(x)x2604(y) : unchanged : good orientation : left,bottom : good preview orientation : left,bottom : good which is now all good if i understand the principle : change "orientation" parameter but don't touch the photo thus leave it in landscape orientation now i must check the photo in the file is well still in landscape orientation i check with exiftool that the preview and the photo are landscape oriented this is good this bug report may be closed ? |