diff --git a/internal/segdisp/dotseg/attributes.go b/internal/segdisp/dotseg/attributes.go
index eeb81f0..3ab2148 100644
--- a/internal/segdisp/dotseg/attributes.go
+++ b/internal/segdisp/dotseg/attributes.go
@@ -29,22 +29,6 @@ import (
 	"github.com/mum4k/termdash/internal/segdisp/sixteen"
 )
 
-// segmentSize given an area for the display determines the size of individual
-// segments, i.e. the width of a vertical or the height of a horizontal
-// segment.
-func segmentSize(ar image.Rectangle) int {
-	// widthPerc is the relative width of a segment to the width of the canvas.
-	const widthPerc = 9
-	s := int(math.Round(float64(ar.Dx()) * widthPerc / 100))
-	if s > 3 && s%2 == 0 {
-		// Segments with odd number of pixels in their width/height look
-		// better, since the spike at the top of their slopes has only one
-		// pixel.
-		s++
-	}
-	return s
-}
-
 // attributes contains attributes needed to draw the segment display.
 // Refer to doc/segment_placement.svg for a visual aid and explanation of the
 // usage of the square roots.
diff --git a/internal/segdisp/dotseg/dotseg_test.go b/internal/segdisp/dotseg/dotseg_test.go
index 63d57cf..47d1b2d 100644
--- a/internal/segdisp/dotseg/dotseg_test.go
+++ b/internal/segdisp/dotseg/dotseg_test.go
@@ -20,6 +20,7 @@ import (
 	"testing"
 
 	"github.com/kylelemons/godebug/pretty"
+	"github.com/mum4k/termdash/cell"
 	"github.com/mum4k/termdash/internal/area"
 	"github.com/mum4k/termdash/internal/canvas"
 	"github.com/mum4k/termdash/internal/canvas/braille/testbraille"
@@ -127,6 +128,85 @@ func TestDraw(t *testing.T) {
 				return ft
 			},
 		},
+		{
+			desc: "smallest valid display 6x5, all segments, sets cell options",
+			opts: []Option{
+				CellOpts(
+					cell.FgColor(cell.ColorRed),
+					cell.BgColor(cell.ColorGreen),
+				),
+			},
+			cellCanvas: image.Rect(0, 0, segdisp.MinCols, segdisp.MinRows),
+			update: func(d *Display) error {
+				for _, seg := range AllSegments() {
+					if err := d.SetSegment(seg); err != nil {
+						return err
+					}
+				}
+				return nil
+			},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				opts := []segment.Option{
+					segment.CellOpts(
+						cell.FgColor(cell.ColorRed),
+						cell.BgColor(cell.ColorGreen),
+					),
+				}
+				testsegment.MustHV(bc, image.Rect(5, 6, 7, 8), segment.Horizontal, opts...)   // D1
+				testsegment.MustHV(bc, image.Rect(5, 12, 7, 14), segment.Horizontal, opts...) // D2
+				testsegment.MustHV(bc, image.Rect(5, 15, 7, 17), segment.Horizontal, opts...) // D5
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:       "smallest valid display 6x5, D1",
+			cellCanvas: image.Rect(0, 0, segdisp.MinCols, segdisp.MinRows),
+			update: func(d *Display) error {
+				return d.SetSegment(D1)
+			},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testsegment.MustHV(bc, image.Rect(5, 6, 7, 8), segment.Horizontal) // D1
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:       "smallest valid display 6x5, D2",
+			cellCanvas: image.Rect(0, 0, segdisp.MinCols, segdisp.MinRows),
+			update: func(d *Display) error {
+				return d.SetSegment(D2)
+			},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testsegment.MustHV(bc, image.Rect(5, 12, 7, 14), segment.Horizontal) // D2
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:       "smallest valid display 6x5, D3",
+			cellCanvas: image.Rect(0, 0, segdisp.MinCols, segdisp.MinRows),
+			update: func(d *Display) error {
+				return d.SetSegment(D3)
+			},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testsegment.MustHV(bc, image.Rect(5, 15, 7, 17), segment.Horizontal) // D3
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
 	}
 
 	for _, tc := range tests {