Batch convert jpegs to monochrome GIFs

[pgON4ID]

Hi. What settings should I use to batch convert 300 jpegs to GIFs that have the following settings:

[fmw42]

try

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

[pgON4ID]

I get nothing but garbage no matter what I try. Can't believe this.

[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

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

[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:




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.

[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.

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convert input -resize 800x800 output

or
cd to some directory, then

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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/