scanned image red lines linux imagemagick

Scanned Image Red Lines on Linux Using Imagemagick

When working with scanned images that have red lines around the edges, it can be frustrating to remove them manually one by one. Luckily, there is a way to batch trim these images using Linux and Imagemagick. In this tutorial, we will explore how to use mogrify and find commands to achieve this.

Firstly, note that mogrify overwrites all files without asking for confirmation. This means you should be careful when running the command. To avoid accidentally deleting files, make sure to test your command in a different directory or with a copy of the original files.

To trim the red lines from your scanned images, you can use the following commands:

* `mogrify -trim *.png`

* `mogrify -trim -fuzz 10% *.png`

The `-trim` option tells Imagemagick to remove any borders of the same color as the corners of the image. The `-fuzz` option is used to specify a percentage of pixels that can be different from the trim color and still be considered part of the border.

To use these commands in combination with find, you can run:

* `find . -type f -name '*.png' -exec mogrify -trim {} \;`

* `find . -type f -name '*.png' -exec mogrify -trim -fuzz 10% {} \;`

The `{}` placeholder is replaced with the name of each file found by find, and the `\;` at the end of the command tells find to execute the command on each file.

If you want to remove a canvas (i.e., a white or transparent border) from your images, you can use the `-repage` option:

* `find . -type f -name '*.png' -exec mogrify -repage {} \;`

When using the trim and fuzz options together, make sure that `-fuzz` comes before `-trim`, as the order of options matters.

In conclusion, using Imagemagick and find commands on Linux, you can batch trim scanned images with red lines and remove unwanted borders. With these simple commands, you can save time and effort when processing your image files.

Scanned image red lines linux imagemagick