Michael Fröschen commented on BATIK-1170:

The applied patch fixes similar issues in my case. It also fixes the issue 

> [PATCH] Workaround for incorrect ColorConvertOp alpha handling breaks masking
> -----------------------------------------------------------------------------
>                 Key: BATIK-1170
>                 URL: https://issues.apache.org/jira/browse/BATIK-1170
>             Project: Batik
>          Issue Type: Bug
>    Affects Versions: 1.8
>            Reporter: Jan Tošovský
>         Attachments: BATIK-1170.patch, ring_mask_after.png, 
> ring_mask_before.png, ring_mask.svg
> There is workaround in Any2LumRed.java with this comment:
> // All this nonsense is to work around the fact that the
> // Color convert op doesn't properly copy the Alpha from
> // src to dst.
> When processing SVG with mask in Oracle JDK 8, this workaround is the root 
> cause of several issues reported here in JIRA.
> The only related issue I've found so far is 
> https://bugs.openjdk.java.net/browse/JDK-8005930. Can anybody confirm the 
> comment/workaround above was targeted for OpenJDK?
> When this code is commented, the result is processed correctly (Oracle JDK). 
> However, I am afraid this is not a proper way how to fix it as this code 
> should produce same results for various JDKs/versions. For this we need a new 
> boolean variable, something like isColorConvertOpAlphaSupported - the result 
> of analyzing destination's alpha (if present or not) after running the simple 
> ColorConvertOp test. That workaround would be applied only if alpha is not 
> supported.

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