enum GimpPixbufTransparency

typedef enum {
  GIMP_PIXBUF_KEEP_ALPHA,
  GIMP_PIXBUF_SMALL_CHECKS,
  GIMP_PIXBUF_LARGE_CHECKS
} GimpPixbufTransparency;

gimp_image_get_thumbnail ()

GdkPixbuf *         gimp_image_get_thumbnail            (gint32 image_ID,
                                                         gint width,
                                                         gint height,
                                                         GimpPixbufTransparency alpha);

Retrieves a thumbnail pixbuf for the image identified by image_ID. The thumbnail will be not larger than the requested size.

Since GIMP 2.2

gimp_drawable_get_thumbnail ()

GdkPixbuf *         gimp_drawable_get_thumbnail         (gint32 drawable_ID,
                                                         gint width,
                                                         gint height,
                                                         GimpPixbufTransparency alpha);

Retrieves a thumbnail pixbuf for the drawable identified by drawable_ID. The thumbnail will be not larger than the requested size.

Since GIMP 2.2

gimp_drawable_get_sub_thumbnail ()

GdkPixbuf *         gimp_drawable_get_sub_thumbnail     (gint32 drawable_ID,
                                                         gint src_x,
                                                         gint src_y,
                                                         gint src_width,
                                                         gint src_height,
                                                         gint dest_width,
                                                         gint dest_height,
                                                         GimpPixbufTransparency alpha);

Retrieves a thumbnail pixbuf for the drawable identified by drawable_ID. The thumbnail will be not larger than the requested size.

Since GIMP 2.2