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Posted to issues@spark.apache.org by "Siddharth Murching (JIRA)" <ji...@apache.org> on 2018/01/24 22:22:00 UTC

[jira] [Created] (SPARK-23205) ImageSchema.readImages incorrectly sets alpha channel to 255 for four-channel images

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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