Copy & Paste with transparent background

[wizard509]

I have noticed that if the pasteboard is colored black for instance and this image is then saved as a png to the desktop and opened with something like Irfanview there seems to be a very definite black background whereas if the pasteboard is not colored and remains white the image exports correctly with no background. please correct me if I am wrong.

[handrawn]

the black is when there is no alpha channel larry - without any information to define the transparency it defaults to black, ie 'no colour'

[wizard509]

Thank you handrawn.