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Only certain dosya tipleri are accepted on the Commons. These are (as of Haziran 24, 2006):
- Resimler: SVG, PNG, JPEG, ve XCF (GIMP) ve SXD (OpenOffice.org 1.x)
- Sesler: Ogg (using FLAC, Speex, ya da Vorbis codecler) ya da MIDI (with extension
- Animasyonlar: currently, only GIF is supported.
- Video: Ogg (using Theora codec)
- Yazılar: PDF for rich yazı dökümanları ve DjVu
- Biraz diğerleri OpenOffice.org 1.x formats: SXW (yazı), SXI (slayt), SXC (spreadsheet)
- DjVu (for scanned documents)
If you need help with viewing or creating these formats please see Commons:Software.
Note that text articles do not belong on the Commons. Please see the Project scope for more information about what is acceptable on the Commons.
Formats not listed above must be converted to one of these before uploading. There is currently no legit way to store pristine original data for conversion to future formats or for use when patents expire, even if the license of a given work requires distributing such pristine original data (as is often the case for works distributed under the GNU Free Documentation License or other copyleft licenses).
JPEG is appropriate for photographs; SVG or PNG are better for drawings / diagrams (SVG is preferred when creating diagrams etc, PNG is good for scanned images, or for print-quality photographs); GIF should only be used for animated images. PNG is a "lossless" format, meaning that the exact pixel color is preserved when saving. GIF also uses lossless compression, but only supports up to 256 colors. JPEG, in contrast, uses "lossy compression", sacrificing precision for smaller file size. SVG is a vector graphics format, so it can be scaled at will without getting blurry or "pixelated", is easy to edit, and usually produces very small files.
Unfortunately the image scaling system is still fairly bad. Currently, thumbnails are generated in the same format as the original image and are always in 24-bit color unless the image is GIF, in which case the resulting image will have 256 colors (the maximum that the GIF format allows). This means that scaling PNG images produces fairly large files even if the original image contained a palette. This also means that if you want to upload a lossless PNG of a photo for editing and archival, but want to use JPEG thumbnails in articles, you have to upload a (full scale) JPEG version manually.
Note that scaling of images may fail if the image is very large and rendering takes too much time or memory (in that case, either no scaled image is shown, or the full image is served to the browser, often causing it to lock up). For PNG images, a hard limit of 12 megapixels is in effect. Large JPEGs are only problematic if they are saved in progressive mode, use baseline mode instead. In case the full scale original is too large to process for the software, please overwrite it with a scaled down version (around 6 megapixels in size); the full scale version will still be available in the upload history, and you can add a reference to it in the image description.
The Commons doesn't accept MP3 sound files (there are numerous patent claims on MP3, making it illegal in some countries to use open source software with MP3, and even proprietary software companies are being threatened with various lawsuits). These should be converted to Ogg files and use the FLAC, Speex, or Vorbis codecs depending on your needs. Speex is intended for recordings of speech, Vorbis is for general audio and is lossy (quality is reduced) — FLAC is for general audio and is lossless (quality is preserved), but current filesize caps prevent its use for anything but short clips. In most cases, Vorbis should be used.
The Commons also does not accept tracker formats, nor does it accept sound fonts for use with MIDI files. If it is important that a musical passage be heard with specific instrument definitions that General MIDI does not provide for, and the license allows it, use your tracker software to render the passage to RIFF WAVE, and then encode it to Ogg Vorbis.
- "." is not an allowed file format. See Commons:File types for more information.
- Make sure that the file you're uploading has one of the allowed extensions (or with this specific error, make sure it has an extension at all!).
- In the field Destination filename be sure to write an extension here as well. For example "Orange_grove_in_summer.jpg" not just "Orange_grove_in_summer".
- A better error message for the case of a missing file extension has been requested on bugzilla:8907