To add a bit to what Steve was saying, Windows Clipboard - where text
and images are temporarily stored when you copy and paste - converts
images to it's own supported formats. These formats need to be 32-bit
per pixel in order to support transparency's alpha channel. However, on
most systems you only get a 24-bit per pixel bitmap, which strips the
transparency bits. That means when you paste it, you'll get a
background color instead of transparency. And even if your system
copies in a 32-bit per pixel format, the application you're pasting into
may not accept the alpha channel and will show the background as a color.
As Steve suggests, saving the image to file will preserve it's format.
On 1/20/2011 1:59 PM, Steve Slevinski wrote:
> Hi Val and Eda,
> The black background is probably caused by an incomplete copy of the
> image. Basically, part of the image is not copied. I'm not sure if
> this is operating system level or browser level. I was never able to
> fix this, but there should be a work-around.
> Instead of "Copy image" from the browser, use the "Save image as..."
> to create a file. The new file will contain the transparent
> background part of the image. If this file doesn't work properly in
> your application, then the application you're using does not fully
> support PNG images.