File Format

In order to avoid artifacts by image compression, which could degrade measurement accuracy and stereo-matching results, lossless image formats (RAW, lossless TIFF, lossless JPEG) are more favorable than lossy JPEG compression. Only RAW image storage allows preserving the full 12-bit image information and the customized postprocessing that is desirable for sophisticated exposure corrections. The possibility of fully controlling the conversion process of RAW measurement values is considered an advantage over in-camera conversion by professionals, although Rieke-Zapp et al. (2009) could show that different RAW development software may have significantly different effects on the photogrammetric measurement accuracy yielded with the images.

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