Image Scaler

It is often necessary to create multiple versions of the same image for various purposes, such as application UIs. Generating them with regular image editors can be very time-consuming, but you can usually find specialized tools for these tasks.

Image Scaler is an open-source utility designed primarily for users who want to create skins for osu!, the popular rhythm game. While it can be used for other purposes as well, you need to be familiar with regular expressions to scale other types of images.

When you launch the application for the first time, all the necessary RegEx filters will already be available. You only need to select the source and destination folders, though you can also have the program save the output files in the same location.

Next, you can select the preferred scaling algorithm. Some will produce higher quality images while others will be faster. Once you’ve set the scaling factor as well, you’re good to go.

The file name and rename filters are fully customizable, but you need to know what you’re doing before modifying them. By default, they will only process images that have “@2x” in their name, and this part will then be removed from the output file names.

It is worth noting that the application does not save your settings after it is shut down, which can be a bit irritating. Setting the source and output folders is easy enough, but it would have been great if at least the RegEx filters were remembered between launches.

Overall, if you’re looking for an easy way to create SD variants of the HD images used by your osu! skins, this utility will do a great job. It is easy to use and doesn’t require installation, but it is not the best choice for processing other types of images.