The problem looks like in this:

void
gib_imlib_save_image_with_error_return(Imlib_Image im, char *file,
                                       Imlib_Load_Error * error_return)
{
   char *tmp;

   imlib_context_set_image(im);
   tmp = strrchr(file, '.');
   if (tmp)
      imlib_image_set_format(tmp + 1);
   imlib_save_image_with_error_return(file, error_return);
}

The listed formats are all lower cases in imlib, I didn't check if imlibs would do anything to format string, I guess it's just do a simple compare, therefore "JPG" still != "jpg".

Here is a quick fix:

diff --git a/src/slideshow.c b/src/slideshow.c
index 6d39d2c..fb1fcc3 100644
--- a/src/slideshow.c
+++ b/src/slideshow.c
@@ -472,7 +472,8 @@ void slideshow_save_image(winwidget win)
    if (!opt.quiet)
        printf("saving image to filename '%s'\n", tmpname);

-   gib_imlib_save_image_with_error_return(win->im, tmpname, &err);
+   imlib_context_set_image(win->im);
+   imlib_save_image_with_error_return(tmpname, &err);
    if (err)
        im_weprintf(win, "Can't save image %s:", tmpname);

According to the imlib doc,

EAPI void imlib_image_set_format ( const char * format )

Sets the format of the current image. This is used for when you wish to save an image in a different format that it was loaded in, or if the image currently has no file format associated with it.

I believe it has format associated already and it's same format as the original file, therefore those two lines have enough information for imlib to save image. I tested with JPG and PNG, I did get the saved files.

Cannot save images with capital letter extensions #51

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