Resized product images background

[ferret_e]

How the white background for resized product images (various thumbnails, for example) can be changed?

I have black background and horizontal aspect ratio and white stripes on all images looks not best...

[ferret_e]

Workaround: in

vendor/magento/framework/View/Design/Theme/Image.php

replace hardcoded color in

$image->backgroundColor([0, 0, 0]);

and in vendor/magento/module-catalog/Model/Product/Image.php

protected $_backgroundColor = [0, 0, 0];

[ferret_e]

I'm doing this after every upgrade... stupid.

[MudithaE]

Please see the background property of https://devdocs.magento.com/guides/v2.2/frontend-dev-guide/themes/theme-images.html

[MudithaE]

Also, I found that only images "Color Type" with "RGB with Alpha" is resizing with a transparent background.

You can check whether your image colour type is "RGB with Alpha" by visiting http://fotoforensics.com and checking the metadata.

If it is not in "RGB with Alpha" color type you can convert the images using photoshop as below.

Then export the file using File -> Export -> Export As 

Make sure you have below settings in the export screens.