What is CRW?
Image Format DescriptionCRW is the file extension for Canon RAW file format. RAW image files are what may be called the “negatives” of digital images. They have all the information available to create an image, and may be converted or processed into images – much like “developing” photographic negatives into pictures. CRW is the name of this unprocessed and uncompressed RAW file format that Canon uses for its digital cameras.
The Canon RAW file format is based on the CIFF (Camera Image File Format) format. Its structure is very similar TIFF’s in the sense that its directories point to data within the file. The only difference is that whereas TIFF’s offsets are absolute, CRW’s are at the beginning of the data block for each directory. This feature is of major importance as it makes it very easy for the re-writer software to successfully re-write the file without having to understand the complete format.
Another important feature of CRW is that the data in the file comes before the directories. This minimizes the amount of memory needed to shield the data within the file. Besides the image data, CRW files can also contain text information, such as on what day and at what time the picture was taken.
The programs that can open CRW files are Canon’s photo viewing software included with the digital camera, Adobe Photoshop AS, and Photoshop Elements versions 3.0 and later on both Microsoft Windows and Mac OS. Factory Image Converter can convert CRW files to other image formats.
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