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Image Enhanced Scaling replaces the image scaling function used by the Image module with one that gives a better image quality. This is achieved by applying a sharpness filter to the image derivatives and converting them to a suitable color profile.

Note: This module has been replaced by ImageMagick Advanced Options which is bundled with Image module as of version 5.x-1.6. However, it doesn't actually depend on Image, and it will affect all image operations in Drupal.

Due to it's better integration with the ImageMagick toolkit, this has several other advantages compared to Image Enhanced Scaling. Performance should be a lot better, and thanks to the cleaner implementation it should be less likely to break.

See the README file for important information on how to install Image Enhanced Scaling. In short, it depends on the Image module and requires that the ImageMagick framework provided by the Image module is installed and properly configured. The GD framework won't work. This also means that you have to have ImageMagick (specifically the convert binary) installed on the server.

Note: Make sure you choose a version that is compatible with the version of Image that you're using:

Image 5.x-1.6 and above
Don't use Image Enhanced Scaling. Instead, check out ImageMagick Advanced Options which is bundled with Image
Image 5.x-1.3 to 1.5
Use 5.x-dev as of July 17 and please report any issues you might have
Image 5.x-1.2 and below
Use 5.x-1.2

Here is an example showing what kind of difference this module can make in some cases.

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