Graphic images can be written to files in several formats, using
externalize-and-write-image
.
All platforms can write at least BMP, JPG, PNG and TIFF files. Call the function
list-known-image-formats
with optional argument
for-writing-too
t
to list the formats that the current platform supports for writing.
On Microsoft Windows and Cocoa you can also write GIF files, while on GTK+ you can also write ICO and CUR (cursor) files. The cursor files that are written with GTK+ can be used on Windows and Cocoa, although on Cocoa it does not recognize the hot-spot in a CUR file.
There is a simple example of writing a PNG image here:
examples/capi/graphics/images-with-alpha.lisp
CAPI User Guide (Macintosh version) - 30 Aug 2011