A pathname designator.
A keyword, or
can also be a cons
is a color specification that is converted to the color to use instead of the color at index
in the color map.
can also be the keyword
:transparent. On most platforms this makes it truly transparent. On Motif it uses the background of the pane that it is associated with by load-image.
read-external-image that the image is in a particular graphics format. Currently the only recognized value is
:bmp, which means the image is read as a Bitmap. Other values of
read-external-image to read the image according to the file type of
"dib" mean that the image is read as a Bitmap. Other file types are handled in Operating System-specific ways. See Working with images for details. The default value of
:background for the
pane. Use an image editing tool to find the transparent color index (183 in this image) and change the call to
read-external-image like this:
CAPI User Guide and Reference Manual (Unix version) - 25 Feb 2015