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Sigma Merrill vs. Sigma Quattro. 3. Color

Summary:  A Sigma DP2 Merrill and dp2 Quattro were used to photograph a 24-patch ColorChecker Classsic.  Image processing (X3F and TIFF) was limited to global adjustments to white balance and exposure.  Color reproduction of each of the 18 non-gray-scale patches was evaluated by comparison to the published ColorChecker (2005) L*a*b* coordinates.  For both cameras, portrait color mode produced the best match to the ColorChecker.  Overall, the Merrill images were a closer match to the reference values, although the difference between cameras was generally not large.

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Key words:  Sigma Quattro, Sigma Merrill, DP2, dp2, ColorChecker, Sigma Photo Pro, BabelColor, LCH color model

Sigma Merrill vs. Sigma Quattro. 2. Image Comparison

Summary:  Sigma Merrill (DP1M and DP2M) and Sigma Quattro (dp1Q and dp2Q) cameras were used to make six raw image comparisons.  For each pair, comparisons were made at Merrill native resolution (4,704 x 3,136) and at Quattro native resolution (5,424 x 3,616).  Images were evaluated for rendition of fine detail.  Quattro images were generally superior to Merrill images when the latter were up-sampled to Quattro dimensions.  Images were much more closely matched when Quattro images were down-sampled to Merrill dimensions.  In that case preference may be largely subjective, and perhaps significantly influenced by post-processing adjustments.  Actual-pixels central-area crops are provided for each of the twelve comparisons.

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Key words:  Sigma Quattro, Sigma Merrill, DP1, dp1, DP2, dp2, RawDigger, Sigma Photo Pro