diff --git a/ext/FreeTypeExt.jl b/ext/FreeTypeExt.jl
index 7dba8cd9..edbcace5 100644
--- a/ext/FreeTypeExt.jl
+++ b/ext/FreeTypeExt.jl
@@ -103,7 +103,7 @@ function UnicodePlots.get_font_face(font = nothing, fallback = fallback_fonts())
     face
 end
 
-UnicodePlots.save_png(args...; kw...) = FileIO.save(args...; kw...)
+UnicodePlots.save_image(args...; kw...) = FileIO.save(args...; kw...)
 
 """
 Match a font using the user-specified search string. Each part of the search string
diff --git a/ext/ImageInTerminalExt.jl b/ext/ImageInTerminalExt.jl
index a0c6c1e6..01f72755 100644
--- a/ext/ImageInTerminalExt.jl
+++ b/ext/ImageInTerminalExt.jl
@@ -8,18 +8,20 @@ else
 end
 using ColorTypes
 
-UnicodePlots.sixel_encode(args...; kw...) = ImageInTerminal.sixel_encode(args...; kw...)
+UnicodePlots.sixel_encode(args...; kw...) = ImageInTerminal.sixel_encode(args...; kw...)  # COV_EXCL_LINE
 UnicodePlots.imshow(args...; kw...) = ImageInTerminal.imshow(args...; kw...)
 
 function UnicodePlots.terminal_specs(img)
+    char_h = char_w = nothing
+    # COV_EXCL_START
     if ImageInTerminal.choose_sixel(img)
         ans = ImageInTerminal.Sixel.TerminalTools.query_terminal("\e[16t", stdout)
         if ans isa String && (m = match(r"\e\[6;(\d+);(\d+)t", ans)) ≢ nothing
             char_h, char_w = tryparse.(Int, m.captures)
-            return char_h ≢ nothing && char_w ≢ nothing, char_h, char_w
         end
     end
-    false, nothing, nothing
+    # COV_EXCL_STOP
+    char_h ≢ nothing && char_w ≢ nothing, char_h, char_w
 end
 
 UnicodePlots.imageplot(img::AbstractArray{<:Colorant}; kw...) =
diff --git a/src/UnicodePlots.jl b/src/UnicodePlots.jl
index 5f363d99..0d2533c6 100644
--- a/src/UnicodePlots.jl
+++ b/src/UnicodePlots.jl
@@ -122,7 +122,7 @@ function __init__()
         colors256!()
         faintcolors!()
     end
-    @static if !isdefined(Base, :get_extension)
+    @static if !isdefined(Base, :get_extension)  # COV_EXCL_LINE
         Requires.@require ImageInTerminal = "d8c32880-2388-543b-8c61-d9f865259254" include(
             "../ext/ImageInTerminalExt.jl",
         )
diff --git a/src/graphics/imagegraphics.jl b/src/graphics/imagegraphics.jl
index ff905375..c4d68d80 100644
--- a/src/graphics/imagegraphics.jl
+++ b/src/graphics/imagegraphics.jl
@@ -24,7 +24,7 @@ end
 @inline nrows(c::ImageGraphics) = first(c.encoded_size)
 @inline ncols(c::ImageGraphics) = last(c.encoded_size)
 
-# `ImageInTerminalExt` placeholders
+# # generic functions for  `ImageInTerminalExt`
 function terminal_specs end
 function sixel_encode end
 function imshow end
diff --git a/src/show.jl b/src/show.jl
index cfbf7972..b38b6ac3 100644
--- a/src/show.jl
+++ b/src/show.jl
@@ -398,10 +398,10 @@ function _show(end_io::IO, print_nocol, print_color, p::Plot)
     )
 end
 
-# `FreeTypeExt` placeholders
+# generic functions for `FreeTypeExt`
 function get_font_face end
 function render_string! end
-function save_png end
+function save_image end
 
 """
     png_image(p::Plot, font = nothing, pixelsize = 32, transparent = true, foreground = nothing, background = nothing, bounding_box = nothing, bounding_box_glyph = nothing)
@@ -597,7 +597,7 @@ function savefig(p::Plot, filename::AbstractString; color::Bool = false, kw...)
     elseif ext == ".png"
         # `png_image` can fail if fonts are not found: a warning has already been
         # thrown there, so just bail out at this stage
-        (img = png_image(p; kw...)) ≢ nothing && save_png(filename, img)
+        (img = png_image(p; kw...)) ≢ nothing && save_image(filename, img)
     else
         "extension \"$ext\" is unsupported: `savefig` only supports writing to `txt` or `png` files" |>
         ArgumentError |>