dcraw is an open-source computer program which is able to read numerous raw image formats, typically produced by high-end digital cameras. dcraw converts these images...
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dcraw is an opensource computer program which is able to read numerous raw image formats, typically produced by highend digital cameras. dcraw converts these images into the standard ppm and tiff image formats. this conversion is sometimes referred to as developing a raw image (by analogy with the process of film development) since it renders raw image sensor data (a "digital negative") into a viewable form.
motivationwhile most camera manufacturers supply raw image decoding software for their cameras, this software is almost always proprietary, and often becomes unsupported when a camera model is discontinued. the file formats themselves are often undocumented, and several manufacturers have gone so far as to encrypt all or part of the data in their raw image format, in an attempt to prevent thirdparty software from accessing it. given this everexpanding plethora of raw image formats, and uncertain and inconsistent support for them by the manufacturers, many photographers worry that their valuable raw images may become unreadable as the applications and operating systems required become obsolete.in contrast to proprietary decoding software, dcraw strives for simplicity, portability, and consistency, as expressed by its author: dcraw's open source nature is crucial in assuring this universality: even if its author loses interest in developing the software, or in supporting a particular model of camera, interested users are free to extend it. this helps ensure that it will be possible to decode supported raw image formats far into the future, even after the cameras that produced them are obsolete.
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