Port of #325 from Java #182
Merged
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Port of drewnoakes/metadata-extractor#325 :
"Problem:
PngDescriptor.GetBackgroundColorDescription() always returns null even if "TagBackgroundColor" has some value. This is because the code checks the "TagColorType" value, but it exists in the different directory (PNG-IHDR).
Solution:
Return the description based on the length of the byte array."