Siddharth Murching created SPARK-23205:
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Summary: ImageSchema.readImages incorrectly sets alpha channel to
255 for four-channel images
Key: SPARK-23205
URL: https://issues.apache.org/jira/browse/SPARK-23205
Project: Spark
Issue Type: Bug
Components: ML, MLlib
Affects Versions: 2.3.0
Reporter: Siddharth Murching
When parsing raw image data in ImageSchema.decode(), we use a [java.awt.Color
constructor|https://docs.oracle.com/javase/7/docs/api/java/awt/Color.html#Color(int)]
that sets alpha = 255, even for four-channel images.
See the offending line here:
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/image/ImageSchema.scala#L172
A fix is to simply update the line to:
val color = new Color(img.getRGB(w, h), nChannels == 4)
instead of
val color = new Color(img.getRGB(w, h))
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