![]() ![]() There is no limitation problem with other image format, as TIFF, JPEG2000, or PNG. The IPTC tag relevant said that image must be limited to 256Ko, but With JPEG container, this break the IPTC metadata SEGMENT which is limited to. The preview image must be JPEG for interroperability. search ObjectPreviewFileFormat tag to see all the format supported. Preview can be written in image with a standard : IPTC. I suspect there is a simpler way to write a thumbnail directly into a segment in a JPEG (not embedded in the Exif data), however I have to do more research to understand this. Thumbnail : image/jpeg, 10837 Bytes <- Thumbnail in embedded tiff! Incidentally the exif data is an embedded tiff: $ exiv2 Stonehenge.exif # exif data is a TIFF ! It's unlikely that you can add/del/mod exif thumbnail until we implement thumbnail editing in Exiv2. The reverse process (to write the tags/binary thumbnail) is formidable. $ dd bs=1 skip=4442 count=10837 if=~/Stonehenge.exif | exiv2 - # extract thumbnail and pipe through exiv2ġ0837 bytes transferred in 0.039951 secs (271257 bytes/sec) We can manually extract the thumbnail from the image as follows:Į L Stonehenge.exifġ5288 bytes transferred in 0.164319 secs (93039 bytes/sec) There are a couple of tags explained on page 24 (physically p29) of the Exif standard: You can download my favourite test file from And for even more complexity, different formats (TIFF, JPEG, PNG etc) can store thumbnails in format specific ways which are not part of the Exif standard. Additionally there can be thumbnails embedded in the MakerNote. It's not a single tag and there can be multiple thumbnails at different resolutions. There is a project being discussed to add this capability, however it's still in early stages of discussion by private email. You cannot modify, delete, or add previews to images. Nano /usr/share/applications/nautilus.At the moment, exiv2 can only read previews in images. ![]() Or preferably for the current user: cp /usr/share/applications/sktop ~/.local/share/applications/ You can edit it using nano for the entire system: sudo nano /usr/share/applications/sktop Kdegraphics-thumbnailers - graphics file format thumbnailers for KDE SCįfmpegthumbnailer - fast and lightweight video thumbnailerįfmpegthumbnailer-dbg - debugging informations for ffmpegthumbnailerįfmpegthumbs - video thumbnail generator using ffmpegįor your second problem, remove this line from /usr/share/applications/sktop (The launcher file for Nautilus - EDIT: For newer versions of Ubuntu use instead of sktop) : OnlyShowIn=GNOME Unity Kdegraphics-strigi-plugins - transitional package for kdegraphics-related plugins Kde-thumbnailer-deb - KDE plugin to show thumbnails of Debian package files Ooo-thumbnailer - thumbnailer for documents Gnome-raw-thumbnailer - RAW file thumbnailer for GNOME exe and other executable thumbnailer for Gnome Libthumbnailer0 - generate thumbnails from files Libthumbnailer-dev - development files for thumbnailer Nautilus-actions - nautilus extension to configure programs to launch Libnautilus-extension1a - libraries for nautilus components - runtime version Probably atleast one of these - at a guess ( EDIT: this was for Ubuntu 13.04/10 - you can search here for thumbnailer packages - e.g. If that fails, you may need to install the programs to thumbnail the files: apt-get install. For the first one, you just may need to edit the settings: ![]()
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