Removing Black Borders from Image

[sameersbn]

Hi,

I have developed application that uses ffmpeg to generate a thumbnail of a video. If the video has black borders then the black borders are also part of the image. I was wondering if it was possible to clip the black borders from the image using magick. Tried searching on google but could not find anything useful (still looking).

Here is a sample image with black borders


Thanks and Regards
~Sameer

[Bonzo]

-trim should do what you want http://www.imagemagick.org/script/comma ... s.php#trim

[sameersbn]

great! thanks for the info.
i was trying to figure out how -fuzz is specified. the doc says distance but couldn't figure out how it is specified.

[Bonzo]

I think fuzz is a percent so it would be something like this:

Code: Select all

convert image_in -fuzz 20% -trim image_out

[fmw42]

I think fuzz is a percent so it would be something like this:

Code: Select all

convert image_in -fuzz 20% -trim image_out

Don't forget the +repage after the -trim if the output is png or gif or tif and not jpg

see http://www.imagemagick.org/Usage/crop/#trim

P.S. Fuzz values can be absolute graylevel in the range of your compile Q8 (0-255) or Q16 (0-65535), but I find percents easier and more flexible and transportable

[sameersbn]

This is perfect.
Thanks guys.

[sameersbn]

For reference here's the command i am using:

Command:
convert before.jpg -bordercolor black -border 1x1 -fuzz 20% -trim after.jpg

References:
http://www.imagemagick.org/script/comma ... s.php#trim
http://www.imagemagick.org/Usage/crop/#trim

Regards
~Sameer