Gimp Alpha different from PNG Alpha?

[Alibasher]

Quote:When you say "display in front of the same grey background" How are you displaying this?

After exporting the image to a png file, inserting the image above a background of the same grey. It happens on webpages, Office software, etc.

Quote:When you create the "white gradient", what settings are you using "FG to Transparent"? What "Blend Color Space" ?

I don't believe the type of gradient should matter, as this is happens to any translucent pixels. The "Blend Space" is set to auto. Not sure if "Blend Color Space" is different?

Quote:What image mode, precision, color management?

Image mode is RGB. Precision is 8 bit integer, perceptual gamma. Colour management is enabled.

Quote:Can you attach an example of the image you have exported please.

Sure, I have attached the example image. I have also added a screenshot of the image being viewed in a browser and Powerpoint and in GIMP on top of the grey background in each.