Hoy vamos a ver como optimizar un SVG que hemos generado a través de Adobe Illustrator.

Cuando exportamos código desde un programa ya sabemos de antemano que va a generar mas código de lo normal, un SVG por su composición no suele ocupar mucho espacio, aun así podemos hacer que ocupe todavía menos si limpiamos el código.

El SVG que vamos a utilizar para este ejemplo es el buzón y sobre que ilustra mi página de contacto: http://jorgeatgu.com/img/iconosobre.svg

Este es el código que genera Illustrator con las opciones por defecto. El archivo en total pesa 19KB.

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129 	<path fill="#FFFFFF" d="M454.956,381.505c-0.783,0.135-3.592,0.107-4.456,0.026h-0.054c-0.027,0.324,0,0.216-0.027,0.973
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156 	<path fill="#FFFFFF" d="M480.504,375.914c0.351,0.135-0.108,0.675,0.026,3.052c0,2.053-0.188,2.458,0.162,4.537
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159 		c-1.296,2.323-4.618,1.513-5.186-0.702c-0.594-2.322-0.405-3.079-0.324-5.429c0-0.729,0.136-2.188,0-2.862
160 		C479.423,375.752,480.287,375.833,480.504,375.914z"/>
161 	<path fill="#FFFFFF" d="M487.985,386.258c-0.513-0.216-0.647-0.729-0.081-1.296c0.027-0.027,0.081-0.055,0.136-0.055
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163 	<path fill="#FFFFFF" d="M497.302,377.372c-0.107,0.135-0.297,0.297-0.378,0.324c-0.648-1.351-3.079-1.756-3.538-0.648
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175 	<path fill="#FFFFFF" d="M509.833,377.075c-0.026,0.405-0.054,0.648-0.026,0.675c-0.055,1.323-0.081,2.215-0.081,2.674
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185 </g>
186 </svg>

ETIQUETA LINE

En las etiquetas line al no tener un color de fondo definido añade un fill="none" el cual no cumple ninguna función ya que el color de la línea lo vamos a definir en stroke="", así que lo borramos.

También añade un stroke-miterlimit="10" esta propiedad se utiliza para limitar el impacto que ocasiona la unión de dos puntos en un segmento. Mucho mejor ver un ejemplo: http://tutorials.jenkov.com/svg/stroke.html#stroke-miterlimit También borraremos esta propiedad ya que en este caso no nos sirve para nada.

Las coordenadas en este ejemplo podemos ver se generan con tres decimales, esta opción la podemos configurar a la hora de exportar desde el panel de Illustrator, en el propio panel nos aconsejan dejarlo en tres, si bajamos de número vamos a perder precisión a la hora de posicionar los puntos. Exportar SVG con un decimal.

Veamos el antes y el después de las tres primeras etiquetas line.

1 <line fill="none" stroke="#95A5A6" stroke-width="7" stroke-miterlimit="10"
2 					x1="261.769" y1="395.169" x2="126.766" y2="395.169"/>
3 <line fill="none" stroke="#95A5A6" stroke-width="15" stroke-miterlimit="10"
4 					x1="410.313" y1="532.349" x2="410.313" y2="398.792"/>
5 <line fill="none" stroke="#6D7575" stroke-width="15" stroke-miterlimit="10"
6 					x1="410.313" y1="417.632" x2="410.313" y2="398.792"/>
1 <line stroke="#95A5A6" stroke-width="7" x1="261.769" y1="395.169" x2="126.766" y2="395.169"/>
2 <line stroke="#95A5A6" stroke-width="15" x1="410.313" y1="532.349" x2="410.313" y2="398.792"/>
3 <line stroke="#6D7575" stroke-width="15" x1="410.313" y1="417.632" x2="410.313" y2="398.792"/>

ETIQUETAS G

En el código podemos ver que Illustrator genera etiquetas g para cada capa, dentro de ellas engloba el contenido de cada capa y lo identifica con un id, si no vamos a animar nuestro SVG podemos prescindir de ellas. Una recomendación es no borrarlas hasta que terminemos nuestro SVG, ya que con los nombres de los id vamos a identificar rápidamente a que pertenece cada parte de nuestro código.

ETIQUETAS PATH Y DEFS

Las etiquetas path de la parte final de este SVG pertenecen a las letras de mi dirección de correo electrónico las cuales he convertido a trazado en Illustrator. La conversión a trazado genera mucho código así que vamos aprovechar parte de ese código para las letras que se repiten a lo largo del documento.

Abrimos una etiqueta defs y dentro de ella vamos a colocar la primera etiqueta path que pertenece a la letra c, y le añadiremos un id="C" para identificar la letra y poder repetir el código a través de la etiqueta use.

1 <defs>
2     <path id="C" fill="#FFFFFF" d="M339.61,377.372c-0.107,0.135-0.297,0.297-0.378,0.324c-0.648-1.351-3.079-1.756-3.538-0.648
3     c-0.513,1.188-0.513,2.053-0.432,3.214c0.107,1.945-0.027,2.782,0.107,3.538c0.136,0.757,0.54,1.216,1.81,1.404
4     c0.54,0.081,1.783-1.053,1.999-1.944c0.081-0.216,1.026,0.243,0.972,0.378c-0.864,1.432-0.566,1.918-2.646,2.566
5     c-2.241,0.729-3.214-1.837-3.295-2.188c-0.189-0.729-0.189-1.162-0.189-1.566c0-0.217,0-0.433,0.027-0.648
6     c0.027-0.243,0.027-0.702,0-1.432c-0.081-1.944-0.297-2.161,0.675-3.97c0.729-1.486,4.564-0.945,4.916,0.351
7     C339.988,377.156,339.718,377.237,339.61,377.372z"/>
8 </defs>

Ahora lo que haremos será invocar este path a través de la etiqueta use.

1 <use xlink:href="#C"/>
2 <use xlink:href="#C" transform="translate(39.5)"/>
3 <use xlink:href="#C" transform="translate(158)"/>

El primer use corresponde a la primera letra C. El segundo y terceruse corresponde a la segunda letra C, le añadimos translate para mover la letra horizontalmente a lo largo del documento. En los parentesis de translate indicamos con el primer valor el movimiento horizontal y con el segundo valor el movimiento vertical.

Ahora repetiremos esta acción con el resto de letras que se repiten.

Vamos a ver todo el código que hemos generado dentro de la etiqueta defs y que corresponde a las letras que se repiten.

 1 <defs>
 2     <path id="C" fill="#FFFFFF" d="M339.61,377.372c-0.107,0.135-0.297,0.297-0.378,0.324c-0.648-1.351-3.079-1.756-3.538-0.648
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 6     c0.027-0.243,0.027-0.702,0-1.432c-0.081-1.944-0.297-2.161,0.675-3.97c0.729-1.486,4.564-0.945,4.916,0.351
 7     C339.988,377.156,339.718,377.237,339.61,377.372z"/>
 8     <path id="O" fill="#FFFFFF" d="M342.203,379.776c0-1.297,0.08-2.593,1.025-3.538c0.541-0.541,1.378-0.702,2.377-0.702
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14     <path id="T" fill="#FFFFFF" d="M359.568,373.564c0-2.242,0.027-2.512,0.108-3.079c0.162-0.081,0.891-0.027,1.107-0.027
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18     <path id="A" fill="#FFFFFF" d="M365.509,376.184c1.243-0.297,1.351-0.702,2.674-0.567c3.809,0.379,2.674,4.511,2.81,7.266
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20     c-0.999,0-3.511,0.676-4.159-1.026c-0.594-1.539-0.647-4.456,0.676-5.536c1.107-0.892,1.998-0.486,3.483-0.243
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24     c0.081,0,0.162-0.026,0.243-0.026c0-0.648,0.135-1.351,0.162-1.972V382.99z"/>
25     <path id="G" fill="#FFFFFF" d="M442.263,388.176c0.027,0.485,0.055,0.864,0.081,1.161c0.108,0.621,0.729,0.783,1.242,0.783
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28     c-0.026-2.484-0.107-6.022,2.377-6.293c0.864-0.081,2.62-0.378,3.133,0.135c0.136,0.136,0.027,3.025,0.162,4.214
29     c0.055,0.459,0.055,0.864,0.027,1.188s-0.054,0.647-0.081,0.945c0,0.297,0,0.81-0.027,1.593v1.054c0,0.918,0.055,1.054,0.055,1.999
30     c0,1.161,0.081,2.646-1.026,3.537c-0.621,0.46-1.054,0.703-1.837,0.703c-0.729,0-1.08-0.027-1.539-0.433
31     c-0.46-0.351-0.783-1.08-0.811-2.377C441.264,387.905,441.966,387.852,442.263,388.176z M441.723,379.884
32     c-0.081,1.161-0.027,0.838-0.027,1.999c0.027,0.351,0.108,0.756,0.271,1.242c0.162,0.459,0.352,0.783,0.567,0.918
33     c0.729,0.433,1.053,0.378,2.7,0.271c-0.081-0.892,0-1.918,0-3.431c0-1.539-0.054-3.078-0.026-4.051
34     c-0.027-0.108-0.676-0.108-0.757-0.108c-0.864-0.026-1.269,0-1.782,0.433c-0.459,0.405-0.811,1.161-0.945,2.565V379.884z"/>
35 </defs>

Y ahora todo el código correspondiente a la dirección de correo electrónico.

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12     <use xlink:href="#T"/>
13     <use xlink:href="#A"/>
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16     <use xlink:href="#O" transform="translate(44.5)"/>
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22     <use xlink:href="#A" transform="translate(36.5)"/>
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37     <use xlink:href="#O" transform="translate(83.5)"/>
38     <path fill="#FFFFFF" d="M439.022,377.372c-0.729-0.648-1.485-1.08-2.484-0.675c-1.135,0.432-0.864,2.296-0.945,3.295
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42     c-0.189-0.135,0.216-0.514,0.513-0.756c0.405,0,1.188,0.566,1.135,0.891c0.54-0.432,1.404-0.891,2.7-0.756
43     c0.757,0.081,0.838,0.486,1.54,0.702C439.535,376.616,439.239,377.291,439.022,377.372z"/>
44     <use xlink:href="#G"/>
45     <path fill="#FFFFFF" d="M454.956,381.505c-0.783,0.135-3.592,0.107-4.456,0.026h-0.054c-0.027,0.324,0,0.216-0.027,0.973
46     c0,1.026,0.297,2.484,1.026,2.7c1.161,0.379,2.484-0.459,2.619-1.458c0-0.271,1-0.054,1.054,0.135
47     c-0.351,1.675-3.024,3.35-4.753,2.106c-1.216-0.837-1.135-3.942-1.216-5.293c-0.081-1.297-0.027-3.295,0.756-4.43
48     c0.486-0.702,0.676-0.648,1.621-0.945c0.405-0.135,0.945-0.107,1.351,0c2.16,0.081,2.269,4.187,2.188,5.563
49     C455.037,381.126,454.956,381.505,454.956,381.505z M450.716,377.21c-0.351,0.892-0.513,2.134-0.405,3.241
50     c1.054,0.243,2.296,0.271,3.674,0.108c0.323-1.513-0.081-5.564-2.647-4.079C451.04,376.643,450.851,376.886,450.716,377.21z"/>
51     <use xlink:href="#A" transform="translate(92)"/>
52     <use xlink:href="#T" transform="translate(106)"/>
53     <use xlink:href="#G" transform="translate(30)"/>
54     <path fill="#FFFFFF" d="M480.504,375.914c0.351,0.135-0.108,0.675,0.026,3.052c0,2.053-0.188,2.458,0.162,4.537
55     c0.297,1.729,2.269,3.106,3.35,1.107c0.242-0.432,0.188-2.322,0.188-4.213c0.027-1.647,0.054-2.755,0.054-4.402
56     c0-0.189,0.838-0.189,1.243-0.027c0,1.647-0.055,2.728-0.055,4.402c0,1.566,0.405,3.187-0.459,4.699
57     c-1.296,2.323-4.618,1.513-5.186-0.702c-0.594-2.322-0.405-3.079-0.324-5.429c0-0.729,0.136-2.188,0-2.862
58     C479.423,375.752,480.287,375.833,480.504,375.914z"/>
59     <path fill="#FFFFFF" d="M487.985,386.258c-0.513-0.216-0.647-0.729-0.081-1.296c0.027-0.027,0.081-0.055,0.136-0.055
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61     <use xlink:href="#C" transform="translate(158)"/>
62     <use xlink:href="#O" transform="translate(158)"/>
63     <path fill="#FFFFFF" d="M509.833,377.075c-0.026,0.405-0.054,0.648-0.026,0.675c-0.055,1.323-0.081,2.215-0.081,2.674
64     c-0.027,3.133-0.055,5.051-0.055,5.726c0,0.189-0.999,0.298-1.188,0.027c0-0.675,0.027-2.593,0.081-5.698
65     c0-0.892-0.081-1.837-0.081-2.701c0-0.271,0.055-1.485-0.026-2.646c0.135-0.136,1.161-0.108,1.323,0.188
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67     c0.54-0.216,0.351-0.242,0.944-0.378c1.837-0.297,2.188,2.106,2.053,3.862c-0.026,0.324-0.054,1.404-0.081,3.241
68     c0,1.81,0.027,3.052,0.055,3.727c-0.055,0.162-0.54,0.081-0.973,0.136c-0.243,0.026-0.297-0.271-0.216-1.459
69     c0.027-0.621,0.054-1.566,0.027-2.836v-3.024c0.135-2.053-0.243-2.944-1.351-2.323c-0.54,0.298-0.648,0.324-1.081,0.757
70     c0.027,1.026,0.055,2.377,0.027,4.078v2.781c0,0.324,0.027,0.676,0.108,1.621c0.026,0.054,0.026,0.135,0.026,0.27v0.108
71     c-0.243,0-1.404,0-1.296-0.135c0-0.757,0-2.025,0.027-3.781c0.026-1.782,0.026-3.079,0-3.916c0.107-1.972-0.838-2.485-1.675-1.837
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Con estos pasos hemos conseguido reducir nuestro SVG de 19KB a 12KB, quizás no sea mucho pero si optimizamos todos nuestros SVG la reducción total seguro que es una cantidad poco despreciable.

Por último para todo aquel que prefiera ir mas rápido tiene a su disposición una web para optimizar online.

http://petercollingridge.appspot.com/svg-editor

Simplemente copiamos nuestro código SVG y le damos a load, ahora veremos un editor con varias opciones y lo mas importante, un visor donde podemos ver al instante los cambios y la reducción que vamos haciendo nuestro SVG a medida que vamos seleccionado las diferentes opciones.

Yo lo he estado probando y no esta mal pero prefiero hacerlo a mano, si probamos el visor con el SVG de este ejemplo y seleccionamos la optimización extrema conseguimos reducirlo a 11.3kb pero el resultado la verdad es que deja mucho que desear ya que acopla muchos elementos y al final perdemos parte del SVG.

ACTUALIZACIÓN 29.11.2013

Si queremos optimizar todavía mas nuestro SVG podemos seguir los pasos del post: crear SVG con Adobe Illustrator y Sublime Text, la idea es ayudarnos de Illustrator y el panel de información para conseguir sustituir los path por formas básicas como rect, circle y así reducir el código sin perder precisión.

SCALABLE, un libro sobre SVGA lo largo de 15 capítulos, 120 páginas y más de 70 ejemplos vamos a ver todo lo que podemos hacer con SVG. Tu pones el precio, disponible desde 0$ para descargar desde LeanPub(PDF, ePUB y MOBI).