How do I crop only height?

Question

I want to crop an image that is anchored at the center, but only crop the height. How can this be done in Drupal 7?

EDIT: The process needs to be automated. Basically I desire the functionality of the existing crop process for an image style, but without the requirement for having to enter a value for both width and height.

EDIT #2: The width needs to be variable :)

Answer 1

You'll have to use custom GD methods I think.

Have a look at this module : https://drupal.org/project/imagecache_actions

With the embed "Custom Actions" module you'll be able to use any gd method you want.

Add a custom filter to an image filter, and find the gd function to use.

In example, to get a B&W picture, the php code to use is :

return imagefilter($image->resource, IMG_FILTER_GRAYSCALE);

Answer 2

Just came across this, and I had a similar issue: crop an image to a fixed height, but leave the width untouched.

ImageCache Actions has a "Define Canvas" option that can take a percentage for one axis ("100% width") and a pixel measurement ("450px") for the other.

I was all set to dig in and monkey with the "Custom Actions" module when I stumbled across "Define Canvas".

Answer 3

I had the same problem today, and luckily found the Image max size crop module.

This module adds an image-style which crops an image when the image dimensions are larger then the given dimensions.

In contrary to the core image style crop only one dimension is required.

In my own tests it does work as advertised. Although more accurate would be:

• ... adds an "image effect", not an "image-style".