add dennis image

examples/README.md

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+
+## Issues
+
+### Values too high
+
+This is supposed to be 1200°C, but is yielding much higher values:
+
+```
+
+DSC1022 (Dennis Calibration Image, 1200°C)
+
+RED     GREEN   RNORM   GNORM   G_n/R_n RES TEMP
+252     84      28.14   8.79    0.3123  2007.8543287627099
+252     77      28.14   7.98    0.2837  1904.7813013618734
+231     67      25.72   6.83    0.2656  1837.354974958358
+215     61      23.88   6.14    0.2571  1805.2478789012494
+182     48      20.08   4.64    0.2312  1704.0179576792798
+103     17      10.98   1.07    0.0976  1098.5597969276637
+97      15      10.29   0.84    0.0817  1015.7460683439863
+63      6       6.37    -0.2    -0.0307 dropped
+
+```