====== Imagemagick ======

===== Tools =====

^ convert | convert between image formats as well as resize an image,  blur, crop,  despeckle,  dither,  draw on, flip, join, re-sample, and much more. |
^ identify | describes the format and characteristics of one or more image files. |

([[http://linux.die.net/man/1/imagemagick|manpage]])

===== Verwendung =====

^ Option ^ Wirkung |
| **-alpha** remove | entfernt Transparenz |
| **-background** white | setzt weißen Hintergrund |
| **-trim** | schneidet den Rand des Bildes weg |

==== JPG → PDF ====

<code>
# general JPG to PDF
convert img1 img2 img3 ... out.pdf

# multiple JPGs to one PDF
convert -append img1 img2 img3 ... out.pdf
</code>

([[http://www.reddit.com/r/linuxquestions/comments/3261to/merge_multiple_jpgs_into_one_pdf/|Quelle [reddit]]])

==== PDF → JPG ====

<code>
# convert page 17 in 300dpi
convert -density 300 input.pdf[16] output.jpg
</code>

==== Qualität und Größe von JPGs in-place verringern ====

  find -name "*.jpg" -exec mogrify -resize 75% -quality 80 {} \;

==== EXIF-Daten entfernen ====

  find -name "*.jpg" -exec mogrify -strip {} \;