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https://issues.apache.org/jira/browse/SPARK-23205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-23205.
-------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 20389
[https://github.com/apache/spark/pull/20389]
> 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
> Assignee: Siddharth Murching
> Priority: Critical
> Fix For: 2.3.0
>
>
> 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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