ocr: TIFF5.0A Appendices If we don'tl have 8-bit samples, we necd to work: al little harder, so that we can make better use of the architecture of most CPUS. Suppose wel have 4-bit samples, packed (wo to a byte, in normal TIFF uncompressed (i.c., Compression=1) fashion, In order to find differences, we want to first expand each 4-bit sample into an 8-bit byte, so that we have one sample per byte, low-order justificd. We then perform the above horizontal differencing. Once the differencing has been completed, we then repack the 4-bit differences (wo to al byte. in normal TIFF uncompressed fashion, I ...
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