ArtRage uses a proprietary file type, ".ptg", which stands for "painting". It can only save as PTG and can only open PSD and PTG files using the File|Open command. However, images can be exported to the following formats: PNG, JPEG, GIF, BMP, TIFF and Adobe Photoshop's .psd format. ArtRage can import all of these file types using the File > Import Image or Import Image as Layer command. Importing PTG files will open the PNG used for thumbnail images instead (this can be used to rescue images from corrupted PTG files).
