diff --git a/kitty/cell_vertex.glsl b/kitty/cell_vertex.glsl
index 5b69c5fc7..2a5b0e1dd 100644
--- a/kitty/cell_vertex.glsl
+++ b/kitty/cell_vertex.glsl
@@ -47,6 +47,7 @@ out float bg_alpha;
 
 #ifdef NEEDS_FOREGROUND
 uniform float inactive_text_alpha;
+uniform float dim_opacity;
 out vec3 sprite_pos;
 out vec3 underline_pos;
 out vec3 strike_pos;
@@ -152,7 +153,7 @@ void main() {
     uint resolved_fg = resolve_color(colors[fg_index], default_colors[fg_index]);
     foreground = color_to_vec(resolved_fg);
     float has_dim = float((text_attrs >> DIM_SHIFT) & ONE);
-    effective_text_alpha = inactive_text_alpha * mix(1.0, 0.75, has_dim);
+    effective_text_alpha = inactive_text_alpha * mix(1.0, dim_opacity, has_dim);
     // Selection
     foreground = choose_color(float(is_selected & ONE), color_to_vec(highlight_fg), foreground);
     // Underline and strike through (rendered via sprites)
diff --git a/kitty/config.py b/kitty/config.py
index a62f2b8c1..684b48b0d 100644
--- a/kitty/config.py
+++ b/kitty/config.py
@@ -356,6 +356,7 @@ type_map = {
     'macos_titlebar_color': macos_titlebar_color,
     'box_drawing_scale': box_drawing_scale,
     'background_opacity': unit_float,
+    'dim_opacity': unit_float,
     'tab_separator': tab_separator,
     'active_tab_font_style': tab_font_style,
     'inactive_tab_font_style': tab_font_style,
diff --git a/kitty/kitty.conf b/kitty/kitty.conf
index 9b7f47e6e..c63276aa3 100644
--- a/kitty/kitty.conf
+++ b/kitty/kitty.conf
@@ -259,6 +259,10 @@ background       #000000
 # Be aware that using a value less than 1.0 is a (possibly significant) performance hit.
 background_opacity 1.0
 
+# How much to dim text that has the DIM/FAINT attribute set. 1.0 means no dimming and
+# 0.0 means fully dimmed (i.e. invisible).
+dim_opacity 0.75
+
 # The foreground for selections
 selection_foreground #000000
 
diff --git a/kitty/shaders.c b/kitty/shaders.c
index 1c8f0afc9..111f187a8 100644
--- a/kitty/shaders.c
+++ b/kitty/shaders.c
@@ -394,9 +394,10 @@ set_cell_uniforms(float current_inactive_text_alpha) {
         cell_uniform_data.gpploc = glGetUniformLocation(program_id(GRAPHICS_PREMULT_PROGRAM), "inactive_text_alpha");
         cell_uniform_data.cploc = glGetUniformLocation(program_id(CELL_PROGRAM), "inactive_text_alpha");
         cell_uniform_data.cfploc = glGetUniformLocation(program_id(CELL_FG_PROGRAM), "inactive_text_alpha");
-#define S(prog, name, val) { bind_program(prog); glUniform1i(glGetUniformLocation(program_id(prog), #name), val); }
-        S(GRAPHICS_PROGRAM, image, GRAPHICS_UNIT); S(GRAPHICS_PREMULT_PROGRAM, image, GRAPHICS_UNIT);
-        S(CELL_PROGRAM, sprites, SPRITE_MAP_UNIT); S(CELL_FG_PROGRAM, sprites, SPRITE_MAP_UNIT);
+#define S(prog, name, val, type) { bind_program(prog); glUniform##type(glGetUniformLocation(program_id(prog), #name), val); }
+        S(GRAPHICS_PROGRAM, image, GRAPHICS_UNIT, 1i); S(GRAPHICS_PREMULT_PROGRAM, image, GRAPHICS_UNIT, 1i);
+        S(CELL_PROGRAM, sprites, SPRITE_MAP_UNIT, 1i); S(CELL_FG_PROGRAM, sprites, SPRITE_MAP_UNIT, 1i);
+        S(CELL_PROGRAM, dim_opacity, OPT(dim_opacity), 1f); S(CELL_FG_PROGRAM, dim_opacity, OPT(dim_opacity), 1f);
 #undef S
         cell_uniform_data.constants_set = true;
     }
diff --git a/kitty/state.c b/kitty/state.c
index a9f1caa4e..f8768741f 100644
--- a/kitty/state.c
+++ b/kitty/state.c
@@ -359,6 +359,7 @@ PYWRAP1(set_options) {
     S(cursor_blink_interval, PyFloat_AsDouble);
     S(cursor_stop_blinking_after, PyFloat_AsDouble);
     S(background_opacity, PyFloat_AsDouble);
+    S(dim_opacity, PyFloat_AsDouble);
     S(inactive_text_alpha, PyFloat_AsDouble);
     S(window_padding_width, PyFloat_AsDouble);
     S(cursor_shape, PyLong_AsLong);
diff --git a/kitty/state.h b/kitty/state.h
index a72dac8d0..cce0cb217 100644
--- a/kitty/state.h
+++ b/kitty/state.h
@@ -26,7 +26,7 @@ typedef struct {
     bool macos_option_as_alt, macos_hide_titlebar, macos_hide_from_tasks;
     int adjust_line_height_px, adjust_column_width_px;
     float adjust_line_height_frac, adjust_column_width_frac;
-    float background_opacity;
+    float background_opacity, dim_opacity;
     float inactive_text_alpha;
     float window_padding_width;
     Edge tab_bar_edge;