Batch Converting Image Files: Difference between revisions
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(Created page with "== `ffmpeg` == Use `ffmpeg`. If `ffmpeg` is not available on the command line, install with `brew install ffmpeg`. == Batch convert `webp` to `jpg` == <syntaxhighlight lang=bash> $ for i in *.webp; do ffmpeg -i "$i" "{i%.webp}.jpg"; done </syntaxhighlight> == Batch convert `png` to `jpg` and scaling images proportionally == The `scale=1024:-1` tells ffmpeg to scale the images to 1024 pixels wide. The height will be scaled proportionally. To scale to a consistent h...") |
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== | == Converting file formats == | ||
Use `ffmpeg`. | Use `ffmpeg`. | ||
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If `ffmpeg` is not available on the command line, install with `brew install ffmpeg`. | If `ffmpeg` is not available on the command line, install with `brew install ffmpeg`. | ||
== Batch convert `webp` to `jpg` == | === Batch convert `webp` to `jpg` === | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
== Batch convert `png` to `jpg` and scaling images proportionally == | === Batch convert `png` to `jpg` and scaling images proportionally === | ||
The `scale=1024:-1` tells ffmpeg to scale the images to 1024 pixels wide. The height will be scaled proportionally. To scale to a consistent height of 800 pixels, `scale=-1:800`. | The `scale=1024:-1` tells ffmpeg to scale the images to 1024 pixels wide. The height will be scaled proportionally. To scale to a consistent height of 800 pixels, `scale=-1:800`. | ||
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<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
$ for i in *.png; do ffmpeg -i "$i" -vf scale=1024:-1 "converted/${i%.*}.jpg"; done | $ for i in *.png; do ffmpeg -i "$i" -vf scale=1024:-1 "converted/${i%.*}.jpg"; done | ||
</syntaxhighlight> | |||
== Batch renaming files == | |||
Use `rename` which can be installed with `brew install rename`. | |||
In the following example, the `-n` option indicates "dry run" for testing purposes. The `-e` option indicates the regex pattern that should be applied. | |||
<syntaxhighlight lang=bash> | |||
$ for i in *.png; do rename -n -e 's/foo(\d\d)_/bar$1/g'; done | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 17:34, 26 April 2022
Converting file formats
Use ffmpeg.
If ffmpeg is not available on the command line, install with brew install ffmpeg.
Batch convert webp to jpg
$ for i in *.webp; do ffmpeg -i "$i" "{i%.webp}.jpg"; done
Batch convert png to jpg and scaling images proportionally
The scale=1024:-1 tells ffmpeg to scale the images to 1024 pixels wide. The height will be scaled proportionally. To scale to a consistent height of 800 pixels, scale=-1:800.
$ for i in *.png; do ffmpeg -i "$i" -vf scale=1024:-1 "converted/${i%.*}.jpg"; done
Batch renaming files
Use rename which can be installed with brew install rename.
In the following example, the -n option indicates "dry run" for testing purposes. The -e option indicates the regex pattern that should be applied.
$ for i in *.png; do rename -n -e 's/foo(\d\d)_/bar$1/g'; done