The code is already there, just change a couple of numbers. I wonder if there is a reason that this hasn't not been done before.

diff --git a/src/imlib.c b/src/imlib.c
index e27db57..96d83cc 100644
--- a/src/imlib.c
+++ b/src/imlib.c
@@ -550,7 +550,7 @@ void feh_draw_info(winwidget w)

        gib_imlib_image_set_has_alpha(im, 1);
        gib_imlib_apply_color_modifier_to_rectangle(im, 0, 0, 290 * tw, 20 * th, NULL, NULL, NULL, atab);
-       gib_imlib_image_fill_rectangle(im, 0, 0, 290 * tw, 20 * th, 0, 0, 0, 0);
+       gib_imlib_image_fill_rectangle(im, 0, 0, 290 * tw, 20 * th, 0, 0, 0, 127);

        if (!info_pipe) {
                gib_imlib_text_draw(im, fn, NULL, 2, 2,
@@ -573,7 +573,7 @@ void feh_draw_info(winwidget w)
        }


-       gib_imlib_render_image_on_drawable(w->bg_pmap, im, 2,
+       gib_imlib_render_image_on_drawable(w->bg_pmap, im, 0,
                        w->h - (th * no_lines) - 2, 1, 1, 0);

        gib_imlib_free_image_and_decache(im);
@@ -1045,7 +1045,7 @@ void feh_draw_actions(winwidget w)

        gib_imlib_image_set_has_alpha(im, 1);
        gib_imlib_apply_color_modifier_to_rectangle(im, 0, 0, tw, th, NULL, NULL, NULL, atab);
-       gib_imlib_image_fill_rectangle(im, 0, 0, tw, th, 0, 0, 0, 0);
+       gib_imlib_image_fill_rectangle(im, 0, 0, tw, th, 0, 0, 0, 127);

        gib_imlib_text_draw(im, fn, NULL, 2, 2, "defined actions:", IMLIB_TEXT_TO_RIGHT, 0, 0, 0, 255);
        gib_imlib_text_draw(im, fn, NULL, 1, 1, "defined actions:", IMLIB_TEXT_TO_RIGHT, 255, 255, 255, 255);

But I did find a strange gap in info drawing, the X is shifted two pixels. Since the width is 290*tw, the info is almost always drawn beyond the screen width (at least in my screen).

The y is pulled up 2 pixels as well, but if removes, character like 'y' will touch the edge of window, it would look weird.

(Edit: there are more draw functions, I only changed these two. Maybe I should open a pull request with all changed and also command line option for turning the background on?)

semi-transparent background for text inserts #60

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