[SOLVED] Resizing image using fractional number

[RyanBram]

As far as I am aware, the -resize command only support natural number or percentage.
I want to resize an image into one-third of its current size. How to achieve this in ImageMagick?

Thanks

[snibgo]

How about 33.33333%?

[fmw42]

In IM 7 (Unix),

Code: Select all

magick -precision 15 image -resize "%[fx:100/3]\%" result

Please always provide your IM version and platform, since syntax may differ.

[RyanBram]

How about 33.33333%?

This is my current workaround. But sometimes I feel that I can work faster if I can use fraction directly without need to converting into percentage.
Eg: Sometimes it will get faster if I can set 4/16 instead of 25% or converting it to simplest fraction 1/4.

In IM 7 (Unix),

Code: Select all

magick -precision 15 image -resize "%[fx:100/3]\%" result

Please always provide your IM version and platform, since syntax may differ.

Currently I am using Windows 10 with ImageMagick 7.
Is "%[fx:100/3]\%" a built in math in Unix shell or feature from ImageMagick? If it is a feature of Unix shell, is there any Windows equivalent to get similar result?

Many thanks to all of you.

[snibgo]

That is a feature of IM v7. For Windows, don't escape the percentage with a backslash.

[fmw42]

It is built into IM 7. See

https://www.imagemagick.org/Usage/transform/#fx_escapes
https://www.imagemagick.org/script/fx.php

[RyanBram]

I created a .bat script in Windows with the following command:

Code: Select all

MAGICK -precision 15 input.png -resize "%[fx:100/3]%" output.png

But resulting the following error:
magick.exe: MissingArgument `-resize' at CLI arg 4 @ fatal/magick-cli.c/ProcessCommandOptions/444

What am I doing wrong?

[snibgo]

In Windows BAT, you need to double the % signs: "%%[fx:100/3]%%"

[RyanBram]

It solved.

Thank you very much for your help.