UNIX tool on MacOS that can increase resolution of a file


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# 1  
UNIX tool on MacOS that can increase resolution of a file

hi,


I am searching for a native tool on MacOS that can increase the resolution of a group of image files whose aspect ratios (file width versus height) vary widely. There are numerous files so I don't wish to do this manually. Someone suggested the sips command with the resampling option but it appears this requires you to input a desired width and height. As found on the sips man page.


Is there some other UNIX command that can do what I wish? All I need to do (I think) is increase the number of pixels so that when the image is blown up then it appears smooth and not grainy or 'washed-out'.


thanks so much for your suggestions.


postscript - These image files are used in an iOS program and the problem appears on the large screen sizes of the ipad pro third generation.
# 2  
You can try ImageMagick on macOS:

Code:
https://imagemagick.org/script/download.php#macosx

Quote:
Use ImageMagick® to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, GIF, HEIC, TIFF, DPX, EXR, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.

ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you may use, copy, modify, and distribute in both open and proprietary applications. It is distributed under a derived Apache 2.0 license.

ImageMagick utilizes multiple computational threads to increase performance and can read, process, or write mega-, giga-, or tera-pixel image sizes.

The current release is ImageMagick 7.0.8-60. It runs on Linux, Windows, Mac Os X, iOS, Android OS, and others.
# 3  
Thanks for the suggestion, however, after investigating that software more carefully it appears that it requires Xquartz/X11 and my understanding is that software is obsolete and doesn't play well with the current version of MacOS. It's a pity because otherwise it appears to be exactly what I need.





Could anyone suggest anything else?
# 4  
I run the latest version of Mojave so let me try to install and see what happens:

Code:
:tmp Tim$ brew install ImageMagick
Updating Homebrew...

# 5  
Seems to install OK on Mojave ...

end of log ..

Code:
...


=> Pouring imagemagick-7.0.8-59.mojave.bottle.tar.gz
  /usr/local/Cellar/imagemagick/7.0.8-59: 1,479 files, 23.4MB
==> `brew cleanup` has not been run in 30 days, running now...
Removing: /usr/local/Cellar/gettext/0.19.8.1... (1,935 files, 16.9MB)
Removing: /Users/Tim/Library/Caches/Homebrew/mtr--0.92.mojave.bottle.tar.gz... (70.1KB)
Removing: /usr/local/Cellar/openssl/1.0.2r... (1,795 files, 12.1MB)
Removing: /Users/Tim/Library/Logs/Homebrew/mtr... (64B)
Removing: /Users/Tim/Library/Logs/Homebrew/rsync... (64B)
Pruned 0 symbolic links and 4 directories from /usr/local
==> Caveats
==> gettext
gettext is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD gettext library & some software gets confused if both are in the library path.

If you need to have gettext first in your PATH run:
  echo 'export PATH="/usr/local/opt/gettext/bin:$PATH"' >> ~/.bash_profile

For compilers to find gettext you may need to set:
  export LDFLAGS="-L/usr/local/opt/gettext/lib"
  export CPPFLAGS="-I/usr/local/opt/gettext/include"

==> libffi
libffi is keg-only, which means it was not symlinked into /usr/local,
because some formulae require a newer version of libffi.

For compilers to find libffi you may need to set:
  export LDFLAGS="-L/usr/local/opt/libffi/lib"

==> openssl
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

openssl is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

If you need to have openssl first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

For compilers to find openssl you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl/include"

==> readline
readline is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only.

For compilers to find readline you may need to set:
  export LDFLAGS="-L/usr/local/opt/readline/lib"
  export CPPFLAGS="-I/usr/local/opt/readline/include"

==> sqlite
sqlite is keg-only, which means it was not symlinked into /usr/local,
because macOS provides an older sqlite3.

If you need to have sqlite first in your PATH run:
  echo 'export PATH="/usr/local/opt/sqlite/bin:$PATH"' >> ~/.bash_profile

For compilers to find sqlite you may need to set:
  export LDFLAGS="-L/usr/local/opt/sqlite/lib"
  export CPPFLAGS="-I/usr/local/opt/sqlite/include"

==> python
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin

If you need Homebrew's Python 2.7 run
  brew install python@2

You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python
==> libtool
In order to prevent conflicts with Apple's own libtool we have prepended a "g"
so, you have instead: glibtool and glibtoolize.

# 6  
Install complete.

Code:
:tmp Tim$ magick logo: logo.gif
:tmp Tim$ identify logo.gif
logo.gif GIF 640x480 640x480+0+0 8-bit sRGB 256c 28576B 0.000u 0:00.000

Seems to work fine for me on macOS Mojave 10.14.6, the above created this logo:

Image
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