Editing Command Line Image Tools

== Preview ==

To preview an image file from the command line:

<syntaxhighlight lang="bash">
$ qlmanage -p filename.jpg
</syntaxhighlight>

== Extracting metadata ==

=== Using ImageMagick ===

<syntaxhighlight lang="bash">
$ convert filename.jpg -print "%w x %h\n" /dev/null
</syntaxhighlight>

== sips ==

`sips` is a command line tool installed by default on Mac OS.

=== Editing images ===

It can be used to flip, crop, and resize image files.

<syntaxhighlight lang="bash">
# changes aspect ratio
$ sips -z [height] [width] path/to/image.jpg
# maintains aspect ratio; width and height cannot exceed value; N.B. uppercase "Z"
$ sips -Z [heightwidth] path/to/image.jpg
# rotate image
sips -r 90 path/to/file.jpg --out rotatedfile.jpg
</syntaxhighlight>

=== Inspecting metadata ===

`sips` supports NEF and PSD file format along with the more command image formats.

<syntaxhighlight lang="bash">
$ sips -g all path/file.extension

  pixelWidth: 1920
  pixelHeight: 1080
  typeIdentifier: public.jpeg
  format: jpeg
  formatOptions: default
  dpiWidth: 72.000
  dpiHeight: 72.000
  samplesPerPixel: 3
  bitsPerSample: 8
  hasAlpha: no
  space: RGB
  profile: sRGB IEC61966-2.1
</syntaxhighlight>

=== Converting file formats ===

<syntaxhighlight lang="bash">
$ sips -s format jpeg -s formatOptions 80 "source_image.tiff" --out "converted_image.jpg"
</syntaxhighlight>

`formatOptions` controls the JPEG compression of the destination image.

== exiftool ==

=== Inspecting metadata ===

Applying the following command to a Photoshop file results in a lot of overly verbose information.

<syntaxhighlight lang="bash">
$ exiftool paris-texas-00_05_34-00001.jpg

ExifTool Version Number         : 12.49
File Name                       : paris-texas-00_05_34-00001.jpg
Directory                       : .
File Size                       : 310 kB
File Modification Date/Time     : 2023:04:07 09:28:48-07:00
File Access Date/Time           : 2023:04:07 11:13:20-07:00
File Inode Change Date/Time     : 2023:04:07 09:28:48-07:00
File Permissions                : -rw-r--r--
File Type                       : JPEG
File Type Extension             : jpg
MIME Type                       : image/jpeg
JFIF Version                    : 1.01
Resolution Unit                 : None
X Resolution                    : 1
Y Resolution                    : 1
Image Width                     : 1920
Image Height                    : 1080
Encoding Process                : Baseline DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Image Size                      : 1920x1080
Megapixels                      : 2.1
</syntaxhighlight>

=== Editing images ===

`exiftool` can also edit images, e.g. [[Change Orientation of NEF Files in EXIF Data||rotating NEF files]].

== ffmpeg ==

`ffmpeg` is useful for [[Batch Converting Image Files|converting image files to different formats]].

== See also ==

* [[Batch Converting Image Files]]
* [[Change Orientation of NEF Files in EXIF Data]]

[[Category:Command Line]][[Category:Bash]][[Category:Zsh]]