LightZone is a free, open-source digital photo editor software application capable of editing JPEG and RAW files similar to Adobe Photoshop Lightroom.

LightZone can create and apply pre-determined image transformations, called "styles," to an entire batch of pictures in a single operation. Using styles, photographers make and save their preferred compensations for each RAW image based upon camera-specific characteristics. Once created, a style is easily applied to multiple images, allowing those standard camera compensations to be applied to every image before the photographer views or edits it.

LightZone is a non-destructive RAW editor. When LightZone edits an original digital image, a new resulting post-edit image file is created, and the original image is left unaltered. By being non-destructive, LightZone preserves the original "digital negative," which contains the maximum information captured by the camera and allows additional images with different transformations to be produced from the original image.

LightZone outputs JPEG files that contain metadata references to the original image file location and a record of the transformations applied during editing.

Because the JPEG output files that LightZone creates include the entire conversion history, edits can always be undone in a new edit session long after being saved. Indeed, the same transformations can be easily reordered, and additional changes applied subsequently to yield further image improvements. Additionally, since changes always begin with the original RAW image rather than an intermediate JPEG version, JPEG compression-related editing artifacts are avoided.

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