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Note that alpha channels support implementation today executes a many subsequental operations. This can lead to CPU load inscreasing and low quality of the resulting image. In the future, it is planned to be implemented using parallel mixing on GPU.
Known issues
1. Default watermark (black picture) will be used if watermark file is damaged or absent
Symptoms: black picture in output stream when watermark is added, there is a message in server log
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Wrong watermark file format. Should be PNG. |
Solution: use only correct PNG file to add watermark