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Software should have come with your Canon camera for managing CR2 format raw images. If not you should be able to download this software from the Canon website. Other free software for this purpose is UFRaw which can be used as stadandalone software or as a plugin for GIMP (free image editing software). If you are getting serious about photography than you may need to bite the bullet and get a commercial product like Adobe Photoshop Lightbench, Phase One's Capture One raw converter, or DxO Optics pro.