Editing Commons:First steps/Quality and description

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{{TNT|First steps tour}}

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This page gives a quick guide to making high quality contributions to Wikimedia.

==How to make perfect media uploads== <!--T:2-->

=== Images === <!--T:3-->

</translate>[[Image:Titan globe.jpg|thumb|<translate><!--T:4--> A space probe image of Saturn's moon Titan uploaded in the highest available quality as well as the recommended image description (click image in order to see the image page)</translate>]]
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Generally speaking, image quality and resolution should be as high as possible so images can be used in high-quality printouts, for example. [[w:MediaWiki|MediaWiki]], the server-side wiki software behind Wikimedia projects, can scale images in most formats on the fly as needed and storage space is not restricted, so concerns about download time and size should not keep you from uploading the highest resolution file available.

=== Size and scaling === <!--T:6-->

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As of November 2019, the MediaWiki software can't handle GIF larger than exactly 100&nbsp;megapixels — but otherwise images in such high resolutions are fine. For animated GIFs, you have to multiply the resolution with the frame count. 
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PNGs are thumbnailed if they are smaller than approximately <tvar|num1>{{LargePNG/limit/parse}}&nbsp;</>megapixels (<tvar|num2>{{LargePNG/limit/full|en}}&nbsp;</>pixels) — <tvar|num3>{{LargePNG/limit/square|en}}</> pixels square (1.00:1), <tvar|num4>{{LargePNG/limit/4:3|en}}</> pixels in the 4:3 [[w:Aspect ratio (image)|aspect ratio]] (1.33:1), <tvar|num5>{{LargePNG/limit/golden ratio}}</> pixels in the [[golden ratio]] (1.62:1), or <tvar|num6>{{LargePNG/limit/16:9}}</> pixels in the 16:9 ratio (1.78:1)

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The {{pg|Commons:Maximum file size|upload size limit}} was increased to 100 MB at the end of 2008. With {{pg|Commons:Chunked uploads|chunked uploading}}, e.g. available through {{pg|COM:Upload Wizard|Upload Wizard}} (a modern Browser is required), it is possible to upload files with a file size up to {{MaxSizeChunkeduploads/GiB}} GB.

=== Filetypes and naming === <!--T:9-->

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Only certain {{pg|Commons:File types|file types}} are allowed in Wikimedia Commons. If you try to upload a different file type, you'll receive an error message.

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The destination filename you give will be the title of the image description page; you may want to follow {{pg|Commons:File naming|naming conventions}}. If you modify an image of others, please upload it under a different filename and add links to and from the original.

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* {{Comseealso|Commons:First_steps/Upload form}}
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=== Format guidance === <!--T:12-->

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Different formats should be used for different types of images. [[w:JPEG|JPEG]] works well with images with lots of details like photographs. A diagram, however, suffers [[w:compression artifact|compression artifact]]s when saved as JPEG and, like [[w:GIF|GIF]] and [[w:Portable Network Graphics|PNG]], cannot be scaled without loss of quality. 
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[[w:Scalable Vector Graphics|SVG]] works well with charts, diagrams, and other images where there are few details. (However, if you can't get the diagram in vector form, PNG is still better than JPEG.) SVG can be edited easily and scaled with no loss of quality, but its use in photographs, for instance, is impractical. 
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GIF is cumbersome for use with the server software and due to inherent restrictions in the format, use of GIF should be restricted to animated images only. For further information on image formats, format conversion, and other format recommendations, see {{pg|Commons:Preparing images for upload}}.

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* '''Photographs:''' For photographs, use [[w:JPEG|JPEG]] (file extension <tt>.jpg</tt> or <tt>.jpeg</tt>). While [[w:TIFF|TIFF]] offers higher quality, these files tend to be rather large, especially when they are not compressed. PNG uses a [[w:Lossless data compression|lossless compression]] (that is: no information is removed) and is thus theoretically better for photographs, but it too produces excessively large file sizes for high-resolution photographs. </translate><translate><!--T:58-->
PNG should be reserved for images that require high quality and/or that it can more easily compress, such as computer screenshots (or diagrams only available in raster form). Do not save JPEG images as "progressive".<ref>Progressive images break the thumbnailer, because the whole image must be rendered, thus exhausting memory. See [[Commons:Village_pump/Archive/2006Nov#Jpeg_format_issue|archived discussion]] and [[Commons:Village_pump/Archive/35#Corrupted_images.3F|example]].</ref> Please optimize JPEG images (this reduces size at no cost to decoding).{{clarify|reason=how?}}
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* '''Animated images:''' For animated images, use [[w:GIF|GIF]] (file extension <tt>.gif</tt>).
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* '''Diagrams:''' For diagrams, charts, etc., [[w:Scalable Vector Graphics|SVG]] (Scalable Vector Graphics, file extension <tt>.svg</tt>) is the preferred type (or, if you can't get vectors, use PNG).

== Audio and video == <!--T:17-->

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Supported sound types are [[w:Musical Instrument Digital Interface|MIDI]] (file extension: <tt>.mid</tt>) and [[w:Vorbis|Ogg Vorbis]] (<tt>.ogg</tt>) and for video files [[w:WebM|WebM]] (<tt>.webm</tt>) or [[w:Theora|Ogg Theora]] (also <tt>.ogg</tt> or <tt>.ogv</tt>). Other widely used sound file formats like [[w:MP3|MP3]] or [[w:Windows Media Audio|WMA]] and video formats like [[w:MPEG|MPEG]] and [[w:Windows Media Video|WMV]] are not allowed at Wikimedia Commons due to patent issues. 

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Like images, quality of sound and video files should not be too low. The upper limit for file sizes [[#Size_and_scaling|is 100 megabytes]], so choose quality depending on the duration of your media file. For information on format conversion and encoding, see {{pg|Commons:Software}}.

== Good file descriptions == <!--T:20-->

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A good file description provides complete information about the file, including legally required information such as its copyright status and source, as well as descriptive information about what it shows and how it was made. Without this information making judgements about the provenance of an image is very difficult and its value is much reduced to editors and researchers.

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To assist you in creating such a description, there is a standardized template for images. Additionally, this template is rendered in a typographically sound way and provides {{pg|Commons:Machine-readable data|Machine-readable data}} which in turn is used for creating [[Help:Gadget-Stockphoto|information for reusers]]. It is therefore highly recommended to use the template.
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'''N.B.''' there are special templates for works of art {{tl|Artwork}} and books {{tl|Book}} that should be used in place of (or, in the case of some photographs, in addition to) the template {{tl|Information}} shown hereafter, see the relevant template documentation pages for more information. 
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Just copy the code below, paste it into the "Summary" field during upload and fill in the blanks:

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<pre><nowiki>
{{Information
|Description=
|Date=
|Source=
|Author=
|Permission=
|Other versions=
}}
</nowiki></pre>

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[[File:Messier-42-10.12.2004-filtered.jpeg|thumb|
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Photo of the Orion Nebula with the recommended description describing how the image was made and a quoted grant from the copyright owner (click image in order to see the image page)</translate>]]
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;The fields are used the following way:
If you can't fill in everything, leave them blank, as the template won't work as advertised otherwise (internationalization, categorization).

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</div>
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;Description:

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Description of the content. What do you see, hear, or otherwise perceive? If it's an artwork, please provide brief historical background. In case of scientific data, a brief scientific abstract of the file. If you have detailed information about an image, for example the name of the species or the size of the object, please add it. Especially with mineral images, including the size is helpful. Stating where a photograph was taken never hurts and is often essential, as for almost any non-astronomical photograph taken outdoors, among others. 
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Descriptions can be in any language, but it is always a good idea to include an English description as well.  If you can write in more than one language, consider adding the description in all of them. See [[:en:Wikipedia:Wikilinks from the Commons|this note about creating wikilinks]].

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: You should use {{pg|Commons:Language templates|templates}} to declare language(s) of the description. It can look like:
<pre><nowiki>
{{Information
|Description=
{{cs|1=Nějaký český popisek.}}
{{en|1=Some description in English.}}
…
|Source=…
</nowiki></pre>
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;Source:

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: Use the template {{t|own}}, if you created that file yourself. Otherwise please supply a
:* Link to a website, with a direct link to the page embedding the file and a direct link to the file
:* Catalog number
:* Name of institution
:* Book source
:* Etc.
:See also {{pg|Commons:Essential information|anchor=Source|Commons:Essential information: Source}}.

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;Date:

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: Date of creation (or date of release), preferably in [[w:en:ISO 8601|ISO 8601]] format, such as <code><nowiki>2006-01-15</nowiki></code> for 15 January 2006.

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;Author:

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: Author(s) of the file. If you don't know any individual, use the name of the institution(s) which released it. In case of self-made work, put your real name (or pseudonym), and link to your username such as "<tt><nowiki>[[User:JQPublic|John Q. Public]]</nowiki></tt>", which will be rendered as "[[User:JQPublic|John Q. Public]]". Alternatively, link to your username in parentheses, such as "<tt><nowiki>John Q. Public ([[User:JQPublic|JQPublic]])</nowiki></tt>" or "<tt><nowiki>John Q. Public ({{U|JQPublic}})</nowiki></tt>", which will be rendered as "John Q. Public ({{U|JQPublic}})".

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;Permission:

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: ''Note:'' You still need to tag the image in any case with the appropriate {{pg|Commons:Copyright tags|license template}} (aka ''Copyright tag'')!
: Supply a short quote of the permission the copyright owner of the file gave you. In case of a general permission (e. g. US Public Domain or free content licenses) supply a short link to that legal disclaimer or an according hint. If you are the copyright owner, but not the author, please indicate this here; if you are the author and copyright-holder, leave it blank and use {{tl|own}} as the source and make sure, you wrap your Copyright tag in {{tl|self}} (e.g. {{tlx|self|Cc-by-sa-3.0}}).

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;Other versions of this file:

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:If there are other version of this file within Wikimedia Commons (for example a black and white version of a color image, or a cropped or uncropped version) use this field to link to these versions with a {{pg|Commons:First steps/Reuse|wikilink}}.
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'''Note:''' For many media it is desirable to use a [[:Category:Geocoding templates|geocoding template]] in addition to the Information template. Please also read {{pg|Commons:First steps/Sorting|First steps/Sorting}}.

=== Upload summary === <!--T:39-->

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When you are uploading a file, the upload form gives you a place for a '''summary'''.  Everything you enter will appear permanently on the image description page, in the "File history" section.

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If you are uploading the first version of a file (there is not already a file with the title you selected), then your upload summary will also be copied to the image description page. It is common in this case to provide complete information in the summary, as detailed under [[#Good file descriptions|Good file descriptions]] hereinbefore.

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If you are uploading a new version of a file, it is important to specify in as much detail as possible '''how you changed the file'''. This information is important because it can be difficult for others to tell the difference between two files. For example, for an image, you could say:

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: ''Cropped 25 pixels off the top, brightened with Photoshop, saved at 95% quality''

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Ideally, one will provide a command line or exact list of commands that reproduces the changes, though this is by no means necessary, and often not possible.

== Notes == <!--T:45-->

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{{reflist}}

== Further reading == <!--T:47-->

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Wikimedia Commons pages:

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* {{pg|Commons:File types}}
* {{pg|Commons:Software}}
* {{pg|Commons:Licensing}}
* {{pg|Commons:Copyright tags}}
* {{pg|Commons:Project scope}}

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Wikipedia page:

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* [[w:Wikipedia:Preparing images for upload|Preparing images for upload]] guide

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[[w:MediaWiki|MediaWiki]] handbook:

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* [[meta:Help:Images and other uploaded files|Images and other uploaded files]]
* [[meta:Help:Image page|Image page]]
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[[Category:Commons image resources]]