SVN commit 556526 by cgilles:
digikam from trunk : thumbnail KIO-slave use now the IPTC preview image to render thumbs on album view (if exist of course).
This way is very fast. If you take a large RAW file and convert it to a new png in 16 bits color depth, an IPTC preview tag will be created. This one will be used instead the whole image !
For example : I take a MRW RAW file from my Dynax 5D (3000x2000 pixels), and i convert it to a new 16 bits PNG file using editor. The size of the target PNG file is around 27Mb. If i take the whole image, thumb rendering thumb take 3-5 seconds on my Laptop PIII-650Mhz. Using IPTC preview tag instead, it take 300-500 mili-seconds !
Note : IPTC preview tag embed a 800x600 JPEG image... This tag is always created when a new image is saved in digiKam editor
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M +10 -0 digikamthumbnail.cpp
--- trunk/extragear/graphics/digikam/kioslave/digikamthumbnail.cpp #556525:556526
@@ -246,6 +246,16 @@
if (!fileInfo.exists())
return false;
+ // Try to use embeded preview image from metadata.
+ DMetadata metadata(path);
+ if (metadata.getImagePreview(image))
+ {
+ kdDebug() << "Use Exif/Iptc preview extraction. Size of image: "
+ << image.width() << "x" << image.height() << endl;
+ return true;
+ }
+
+ // Else, use the right way depending of image file extension.
QString ext = fileInfo.extension().upper();
if (ext == QString("JPEG") || ext == QString("JPG"))
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