The ImageScaler scales all images dragged to one of its tiles. The tile's configuration specififes the most long side of the target image. So either if this is the width or the height, the scaler will adapt the target size to this setting automatically. The orientation of the image will not be changed.
The general tile handing is described here
The general configuration handling is described here.
|Size of the most long side||The target length of the most long side of the image in pixels|