Page 1 of 1

Batch convert jpegs to monochrome GIFs

Posted: 2014-07-31T04:57:54-07:00
by pgON4ID
Hi. What settings should I use to batch convert 300 jpegs to GIFs that have the following settings:

Image

Re: Batch convert jpegs to monochrome GIFs

Posted: 2014-07-31T09:31:03-07:00
by fmw42
try

Code: Select all

-colorspace gray +dither -colors 2 -auto-level

Re: Batch convert jpegs to monochrome GIFs

Posted: 2014-07-31T16:06:31-07:00
by pgON4ID
I get nothing but garbage no matter what I try. Can't believe this.

Re: Batch convert jpegs to monochrome GIFs

Posted: 2014-07-31T16:45:19-07:00
by fmw42
What version of IM and platform? If an old version of IM, you might consider upgrading.

What was your exact command line?

This worked fine for me on IM 6.8.9.6 Q16 Mac OSX

Code: Select all

convert rose: -colorspace gray +dither -colors 2 -auto-level rose_binary.gif

Re: Batch convert jpegs to monochrome GIFs

Posted: 2014-07-31T17:09:18-07:00
by pgON4ID
Downloaded it for the first time today off of ImageMagick's website. Seems like nothing works. For example, while the two example codes in this article produce new images and don't give me any errors, the specified image modifications are not performed: http://www.ioncannon.net/linux/81/5-ima ... es-part-1/


And the example (convert –resize 800x800 *.jpg) in this nice introductory guide produces the following error:

Image


And as you can see, I need to move the images into ImageMagick's directory to get it to work at all, which is in contrast with the above tutorial as well as a youtube video I watched.

Re: Batch convert jpegs to monochrome GIFs

Posted: 2014-07-31T18:13:16-07:00
by fmw42
convert –resize 800x800 *.jpg
Convert does not work this way. It requires one input and makes one output. If you want to process all files in a folder, then use mogrify.

Code: Select all

convert input -resize 800x800 output
or
cd to some directory, then

Code: Select all

mogrify -resize 800x800 *.jpg
But be careful, this will overwrite your image. If you do not want that, then create a new empty directory and use the -path option in mogrify.


see

http://www.imagemagick.org/script/convert.php
http://www.imagemagick.org/script/mogrify.php
http://www.imagemagick.org/Usage/basics/#syntax
http://www.imagemagick.org/Usage/basics/#mogrify

For new users, see
http://www.imagemagick.org/Usage/reference.html
http://www.imagemagick.org/Usage/
http://www.imagemagick.org/script/comma ... -tools.php
http://www.imagemagick.org/Usage/windows/