Commons:Primeros pasos/Calidad y descripción

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This page is a translated version of a page Commons:First steps/Quality and description and the translation is 23% complete. Changes to the translation template, respectively the source language can be submitted through Commons:First steps/Quality and description and have to be approved by a translation administrator.

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

How to make perfect media uploads

Images

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)

Generally speaking, image quality and resolution should be as high as possible so images can be used in high-quality printouts, for example. 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

As of May 1, 2013, the MediaWiki software can't handle GIF and TIFF images larger than exactly 50 megapixels — but otherwise images in such high resolutions are fine. For animated GIFs, you have to multiply the resolution with the frame count. PNGs are thumbnailed if they are smaller than approximately 2,500 megapixels (2,500,000,000 pixels) — 50,000×50,000 pixels square (1.00:1), 57,732×43,299 pixels in the 4:3 aspect ratio (1.33:1), 63,600×39,307 pixels in the golden ratio (1.62:1), or 66,656×37,494 pixels in the 16:9 ratio (1.78:1)

The upload size limit was increased to 100 MB at the end of 2008. With chunked uploading, e.g. available through Upload Wizard (a modern Browser is required), it is possible to upload files with a file size up to 4 GB.

Filetypes and naming

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

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

Format guidance

Different formats should be used for different types of images. JPEG works well with images with lots of details like photographs. A diagram, however, suffers compression artifacts when saved as JPEG and, like GIF and PNG, cannot be scaled without loss of quality. 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. 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 Commons:Preparing images for upload.

  • Photographs: For photographs, use JPEG (file extension .jpg or .jpeg). While TIFF offers higher quality, these files tend to be rather large, especially when they are not compressed. PNG uses a 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. 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".[1] Please optimize JPEG images (this reduces size at no cost to decoding).[Por favor aclarar]
  • Animated images: For animated images, use GIF (file extension .gif).
  • Diagrams: For diagrams, charts, etc., SVG (Scalable Vector Graphics, file extension .svg) is the preferred type (or, if you can't get vectors, use PNG).

Audio and video

Supported sound types are MIDI (file extension: .mid) and Ogg Vorbis (.ogg) and for video files WebM (.webm) or Ogg Theora (also .ogg or .ogv). Other widely used sound file formats like MP3 or WMA and video formats like MPEG and WMV are not allowed at Wikimedia Commons due to patent issues.

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

Descripción detallada del archivo

Una buena descripción provee información completa y detallada del archivo, incluyendo información legal requerida como el estado del copyright o las fuentes, e información descriptiva sobre qué es lo que se muestra y cómo se hizo.

The following is neither possible nor required if you use Commons:Upload Wizard for uploading, which is the default way for uploading at Commons now.

Para guiarle en la cumplimentación de la información sobre el archivo existe una plantilla estandarizada. Se recomienda su uso. Para usarla, copia el código que se muestra a continuación y pégalo en el apartado "Resumen" del formulario de subida de archivos:

N.B. there are special templates for works of art {{Artwork}} and books {{Book}} that should be used in place of (or, in the case of some photographs, in addition to) the template {{Information}} shown hereafter, see the relevant template documentation pages for more information. Just copy the code below, paste it into the "Summary" field during upload and fill in the blanks:

{{Information
|Description = 
|Source = 
|Date =
|Author = 
|Permission = 
|other_versions = 
}}
Fotografía de la nebulosa de Orión, con la información recomendada describiendo cómo se hizo la imagen y el permiso explícito de su autor (haga clic sobre la imagen para ver su página de descripción)
Los campos de la plantilla son usados de la siguiente forma

Si no puedes rellenar todos los campos escribe un guión (–) en los campos vacíos. Por favor, no dejes campos en blanco o la plantilla no funcionará como se espera.

Description
Descripción del contenido. ¿Qué es lo que se puede ver, oír o percibir? Si es una obra de arte, por favor, añade una pequeña reseña histórica. Si se trata de datos científicos, un breve resumen. La descripción puede estar en cualquier idioma. Sin embargo, es una buena idea incluir una descripción en inglés. Si conoces varios idiomas considera la opción de añadir una descripción en cada idioma.

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 this note about creating wikilinks.

The following is neither possible nor required if you use Commons:Upload Wizard for uploading, which is the default way for uploading at Commons now.
You should use templates to declare language(s) of the description. It can look like:
{{Information
|Description=
{{cs|1=Nějaký český popisek.}}
{{en|1=Some description in English.}}
…
|Source=…
Source
Utiliza una frase como "Own Work" (trabajo propio) o similar si el archivo lo has creado tú. En caso contrario, por favor, proporciona:
  • Un enlace a la página web que contiene el archivo original y un enlace directo a ese archivo.
  • Número del catálogo
  • Nombre de la institución
  • Fuente bibliográfica
  • etc.
Date
Fecha de creación o publicación, preferiblemente en formato ISO 8601, como “2006-01-08” para el 8 de enero de 2006.
Author
Autor del archivo. Si no sabes el nombre de ninguno de los autores, utiliza el nombre de la(s) institución(es) que lo publicaron. Si se trata de una obra propia escribe tu nombre real y, entre paréntesis, un enlace a tu nombre de usuario como, por ejemplo, “John Q. Public ([[User:JQPublic|JQPublic]])”, que aparecerá como “John Q. Public (JQPublic)”. También puedes enlazar diréctamente tu nombre real con tu usuario como, por ejemplo, “[[User:JQPublic|John Q. Public]]”.
The following is neither possible nor required if you use Commons:Upload Wizard for uploading, which is the default way for uploading at Commons now.
Permission
Nota: Aún así, necesitas identificar correctamente la licencia de la imagen con la plantilla apropiada. Si no sabes cómo, mírate Primeros pasos/Selección de licencia.
Incluye una pequeña descripción de los permisos que el poseedor de los derechos sobre el archivo te ha concedido. En caso de que se trate de permisos generales (como el Dominio Público de los Estados Unidos o licencias de contenido libre) proporciona un enlace al aviso legal o al acuerdo de licencia. Si eres el poseedor de los derechos de copia, proporciona un pequeño aviso como, por ejemplo, “Licencia dual bajo la GFDL y CC-By-SA-2.5, 2.0, y 1.0”. También puedes escribir “See Below” (ver más abajo) para apuntar a la etiqueta de licencia que sigue a esta información.
other_versions
Si existen otras versiones de este archivo en Wikimedia Commons (por ejemplo, una versión en blanco y negro de una imagen en color) usa este campo para enlazar esas versiones.

Nota: Por favor, lee también Primeros pasos/Clasificación.

Upload summary

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.

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 hereinbefore.

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:

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

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

  1. Progressive images break the thumbnailer, because the whole image must be rendered, thus exhausting memory. See archived discussion and example.

Further reading

Wikimedia Commons pages:

Wikipedia page:

MediaWiki handbook: