The transparent pixel of a PNG image becomes black in preview
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Issue
- When we upload a PNG image with transparency to Documents and Media, the preview image converts the transparent pixel to black.
Environment
- Liferay DXP 7.0, Liferay DXP 7.1
Resolution
-
This behavior was a limitation by Java vendor. When scaling the image and using java.awt.image.BufferedImage for creating the new image, in case the image has 8-bit color model (the type is TYPE_BYTE_INDEXED), based on the implementation limitation the new color model is losing the alpha and transparency properties. Because it is a limitation by the Java vendor, we are unable to proceed with a fix on the Liferay code.
- The workaround is to use PNG32 images when dealing with transparent backgrounds.
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