Hi Mike,

I'm glad you got your graphic to look right. I'll will try to answer a couple of your questions.

"I notice in the X3 overview on the Corel website that the colour palette has transparent white. Would this have solved the problem? or is that just a lazy way of producing the image."

Transparent white lets what's behind it show through, in this case it would have been your purple triangle. PNG graphics support transparency, if you apply a percentage of transparency to an object with nothing behind it, your background color would have shown through it according to the percentage.

"Do any other versions of Coreldraw offer this facility?"

My previous version of Draw before I got X3 was 9. There was no support for PNG files at all. I don't know in what version that changed. The PNG support is one of my favorite things about using X3.

"Can you also explain please the purpose of the Image Color option when exporting as a PNG?"

The Mask option is not supported in all the different color modes. It is the best option to use when available.

"Trimming - that was easy.

I wish I'd known about that a long time ago !!!"

You could have also "Combined" your circle and triangle to get a similar result, but trimming probably was the best option in this case.