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
:backgroundfor the viewer pane. Use an image editing tool to find the transparent color index (183 in this image) and change the call to
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017