GitHub user smurching opened a pull request:
https://github.com/apache/spark/pull/20389
[SPARK-23205][ML] Update ImageSchema.readImages to correctly set alpha
values for four-channel images
## What changes were proposed in this pull request?
When parsing raw image data in ImageSchema.decode(), we use a
[java.awt.Color](https://docs.oracle.com/javase/7/docs/api/java/awt/Color.html#Color(int))
constructor that sets alpha = 255, even for four-channel images (which may
have different alpha values). This PR fixes this issue & adds a unit test to
verify correctness of reading four-channel images.
## How was this patch tested?
Updates an existing unit test ("readImages pixel values test" in
`ImageSchemaSuite`) to also verify correctness when reading a four-channel
image.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/smurching/spark image-schema-bugfix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20389.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20389
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commit 054c1dd457e5c95872a188f7978f678d7c7093d5
Author: Sid Murching <sid.murching@...>
Date: 2018-01-24T22:34:08Z
Bugfix + test
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