Cached image color washaway / black opacity top of image

[rajankonar]

Hi,

Previously i was using magento default GD2 library please find attached snapshot

after installing imagemagick we are facing still same issue

issue is our original image high in contrast after install image get cached image lose quality and black opacity get added in image, we tried setquality 100 opacity 0 all available option in stackoverflow and etc

please help us regarding this