Transparent background with incorrect file type

[thomaskiesl]

Describe the bug
If png files/images with alpha channels (transparent background) are renamed from .png to .jpg the following exception comes up. Changing the file type to .png it was processed as expected.

javax.imageio.IIOException: Bogus input colorspace at java.desktop/com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeImage(Native Method) at java.desktop/com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeOnThread(JPEGImageWriter.java:1035) at java.desktop/com.sun.imageio.plugins.jpeg.JPEGImageWriter.write(JPEGImageWriter.java:385) at com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageWriter.write(JPEGImageWriter.java:175) at java.desktop/javax.imageio.ImageWriter.write(ImageWriter.java:613) at java.desktop/javax.imageio.ImageIO.doWrite(ImageIO.java:1632) at java.desktop/javax.imageio.ImageIO.write(ImageIO.java:1558)

It happens on production, because someone tried to upload such a file. Maybe there is an easy way to fix this.

Version information
1The version of the TwelveMonkeys ImageIO library in use.
3.12.0