Opacity png watermark became white box on product images

[Koc]

Preconditions

1. Magento 2.1.8
2. PHP 7.0.21

Steps to reproduce

1. Create product with jpeg images
2. Configure use transparent png watermark (attached to ticket above)
   

Expected result

1. expected image with waternark on bottom like
   

Actual result

1. got image with white box instead of nice watermark
   

Addtional info

opacity = 100% (because png has own opacity)
size=empty string
position=bottom/right

[Koc]

#9662 not fixes this issue :(

[orlangur]

Did it work with JPEG anytime before?

[orlangur]

Possibly related https://stackoverflow.com/a/11681066 https://stackoverflow.com/a/38591492.

Watermark attached is PNG-8 though.

[Koc]

Did it work with JPEG anytime before?

not sure. For Magento1 I had used own small "microservice" based on Symfony and Imagine library. And it works ok, see above.

[magento-engcom-team]

@Koc Thank you for your report.
How exactly did You set up watermark? Please give parameters from Content > Design > Configuration > You website > Product Image Watermarks

[Koc]

@magento-engcom-team
opacity = 100% (because png has own opacity)
size=empty string
position=bottom/right

[magento-engcom-team]

Hi @Koc thank you for the update. We updated issue description

[Koc]

does needs update label should be removed or not?