Removes the height attribute and adds a class to img tags. Set max-width:100% for the class in your CSS and you have fluid images.
TextformatterFluidImages
A textformatting module for ProcessWire that strips the height attribute from any <img> tag and adds a
configurable CSS class. By default, the class image-width-control will be used.
To complete making the image tags fluid, add the following to your stylesheet
.image-width-control {
max-width:100%;
}Credits
This is based upon the RemoveHeights textformatter by Diogo Oliveira.
Install and use modules at your own risk. Always have a site and database backup before installing new modules.