ImageMagick - Issue with Windows and convert function

Question

I'm trying to use imagemagick to create a simple .gif file from a few png files, using the general approach outlined here: http://www.r-bloggers.com/animated-plots-with-r/

However, I'm on a Windows 10 machine, and I think that's causing problems with the convert function as generally described here: http://www.imagemagick.org/discourse-server/viewtopic.php?t=19679

Can someone please explain how I can either change imagemagick or Windows so that it works?

Specifically the command I'm giving and the error that occurs is shown below:

convert *.png new.gif

The error:

Invalid Parameter - the.gif

Thank you for your help.

convert is a command, not a function.

Keith Thompson
– Keith Thompson

2016-08-22 19:47:36 +00:00
Commented Aug 22, 2016 at 19:47 — Keith Thompson
– Keith Thompson, Commented Aug 22, 2016 at 19:47

dlemstra · Accepted Answer · 2016-07-02 19:50:03Z

14

You probably installed ImageMagick 7.X on your machine. This version no longer includes convert.exe and the error that you are receiving is from the convert command of Windows. You can use magick.exe instead or select Install legacy utilities (e.g. convert) during the installation to install convert.exe on your machine..

answered Jul 2, 2016 at 19:50

dlemstra

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3 Comments

Bonzo Over a year ago

I thought convert was going to be a alias or whatever it is called for magick @dlemstra so it would still work.

AME Over a year ago

Thank you to both of you. The answer that @dlemstra indicates worked. Specifically, I installed the legacy utilities, and then the convert function worked. Thank you.

Xenos Over a year ago

Note that convert is also a windows command ("converts a FAT partition to NTFS") hence the erroneous parameter (you're actually calling the "FAT2NTFS" utility from windows, which do not know the Image magick's convert parameters)

Michel de Ruiter · Accepted Answer · 2016-08-23 07:58:15Z

5

Instead of convert.exe <args>, use magick.exe convert <args>.

edited Aug 23, 2016 at 7:58

answered Aug 22, 2016 at 19:35

Michel de Ruiter

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2 Comments

Bonzo Over a year ago

Imagick is a php API for Imagemagick; how is imagick.exe going to work in this case?

Michel de Ruiter Over a year ago

The name imagick has been proposed however.

Treefish Zhang · Accepted Answer · 2016-11-09 20:39:02Z

With Version: ImageMagick 7.0.3-4 Q8 x64 2016-10-10 on my Windows 10, adding 'magick' in front of 'convert' gets rid of the 'invalid parameter' error. For example, magick convert foo.jpg -quality 60 low_foo.jpg If preferring to define the steps in a file: save the following file as convert.sh:
SRC="$1" LOW=60 magick convert $SRC.jpg -quality $LOW low_$SRC.jpg magick convert $SRC.jpg -quality $LOW low_$SRC.webp magick convert $SRC.jpg -quality $LOW -resize 50% "$SRC"_"$LOW"q_50pc.jpg magick convert $SRC.jpg -quality $LOW -resize 50% "$SRC"_"$LOW"q_50pc.webp and running sh convert.sh foo at a bash command prompt processes foo.jpg in four different ways. It bears to mention that after the installment, 'C:\Program Files\ImageMagick-7.0.3-Q8' appears first on the list at the System/Advanced System Setting/System Variable/Path.

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