In my previous article to resize image in Magento, I had written direct code to resize any image. Here, I will be writing a simple function to resize image proportionally, which can be kept in the helper file of the module (as helper file can be accessed by any template (.phtml) file). Here is the [...]

Image functions are defined in catalog/image helper. getOriginalWidth gives width of image. getOriginalHeigh gives height of image. It is not getOriginalHeight().  Spelling mistake from Magento :- )

You can resize image with fixed height and variable width. Or, you can resize with fixed width and variable height. Following code shows how you do it in Magento. Fixed width of 600px