image/tree: Fix table header having escape codes when not tty

cli/command/image/testdata/list-command-success.filters.golden

@@ -1,2 +1,2 @@
                                                                Info ->  U In Use
-IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA
+IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA

cli/command/image/testdata/list-command-success.format.golden

@@ -1,2 +1,2 @@
                                                                Info ->  U In Use
-IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA
+IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA

cli/command/image/testdata/list-command-success.match-name.golden

@@ -1,2 +1,2 @@
                                                                Info ->  U In Use
-IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA
+IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA

cli/command/image/testdata/list-command-success.simple.golden

@@ -1,2 +1,2 @@
                                                                Info ->  U In Use
-IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA
+IMAGE   ID             DISK USAGE   CONTENT SIZE   EXTRA

cli/command/image/tree.go

@@ -224,12 +224,12 @@ func getPossibleChips(view treeView) (chips []imageChip) {
 	return possible
 }
 
-func printImageTree(dockerCLI command.Cli, view treeView) {
-	if streamRedirected(dockerCLI.Out()) {
-		_, _ = fmt.Fprintln(dockerCLI.Err(), "WARNING: This output is designed for human readability. For machine-readable output, please use --format.")
+func printImageTree(outs command.Streams, view treeView) {
+	if streamRedirected(outs.Out()) {
+		_, _ = fmt.Fprintln(outs.Err(), "WARNING: This output is designed for human readability. For machine-readable output, please use --format.")
 	}
 
-	out := tui.NewOutput(dockerCLI.Out())
+	out := tui.NewOutput(outs.Out())
 	_, width := out.GetTtySize()
 	if width == 0 {
 		width = 80
@@ -241,6 +241,8 @@ func printImageTree(dockerCLI command.Cli, view treeView) {
 	topNameColor := out.Color(aec.NewBuilder(aec.BlueF, aec.Bold).ANSI)
 	normalColor := out.Color(tui.ColorSecondary)
 	untaggedColor := out.Color(tui.ColorTertiary)
+	titleColor := out.Color(tui.ColorTitle)
+
 	isTerm := out.IsTerminal()
 
 	out.Println(generateLegend(out, width))
@@ -316,7 +318,7 @@ func printImageTree(dockerCLI command.Cli, view treeView) {
 			_, _ = fmt.Fprint(out, strings.Repeat(" ", columnSpacing))
 		}
 
-		_, _ = fmt.Fprint(out, h.Print(tui.ColorTitle, strings.ToUpper(h.Title)))
+		_, _ = fmt.Fprint(out, h.Print(titleColor, strings.ToUpper(h.Title)))
 	}
 	_, _ = fmt.Fprintln(out)
 

cli/command/image/tree_test.go

@@ -0,0 +1,132 @@
+package image
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/docker/cli/internal/test"
+	"gotest.tools/v3/assert"
+)
+
+func TestPrintImageTreeAnsiTty(t *testing.T) {
+	testCases := []struct {
+		name         string
+		stdinTty     bool
+		stdoutTty    bool
+		stderrTty    bool
+		expectedAnsi bool
+	}{
+		{
+			name:      "non-terminal",
+			stdinTty:  false,
+			stdoutTty: false,
+			stderrTty: false,
+
+			expectedAnsi: false,
+		},
+		{
+			name:      "terminal",
+			stdinTty:  true,
+			stdoutTty: true,
+			stderrTty: true,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdout-tty-only",
+			stdinTty:  false,
+			stdoutTty: true,
+			stderrTty: false,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdin-stderr-tty-only",
+			stdinTty:  true,
+			stdoutTty: false,
+			stderrTty: true,
+
+			expectedAnsi: false,
+		},
+		{
+			name:      "stdout-stdin-tty",
+			stdinTty:  true,
+			stdoutTty: true,
+			stderrTty: false,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdout-stderr-tty",
+			stdinTty:  false,
+			stdoutTty: true,
+			stderrTty: true,
+
+			expectedAnsi: true,
+		},
+		{
+			name:      "stdin-tty-only",
+			stdinTty:  true,
+			stdoutTty: false,
+			stderrTty: false,
+
+			expectedAnsi: false,
+		},
+		{
+			name:      "stderr-tty-only",
+			stdinTty:  false,
+			stdoutTty: false,
+			stderrTty: true,
+
+			expectedAnsi: false,
+		},
+	}
+
+	mockView := treeView{
+		images: []topImage{
+			{
+				Names: []string{"test-image:latest"},
+				Details: imageDetails{
+					ID:          "sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
+					DiskUsage:   "10.5 MB",
+					InUse:       true,
+					ContentSize: "5.2 MB",
+				},
+				Children: []subImage{
+					{
+						Platform:  "linux/amd64",
+						Available: true,
+						Details: imageDetails{
+							ID:          "sha256:abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
+							DiskUsage:   "5.1 MB",
+							InUse:       false,
+							ContentSize: "2.5 MB",
+						},
+					},
+				},
+			},
+		},
+		imageSpacing: false,
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			cli := test.NewFakeCli(nil)
+			cli.In().SetIsTerminal(tc.stdinTty)
+			cli.Out().SetIsTerminal(tc.stdoutTty)
+			cli.Err().SetIsTerminal(tc.stderrTty)
+
+			printImageTree(cli, mockView)
+
+			out := cli.OutBuffer().String()
+			assert.Check(t, len(out) > 0, "Output should not be empty")
+
+			hasAnsi := strings.Contains(out, "\x1b[")
+			if tc.expectedAnsi {
+				assert.Check(t, hasAnsi, "Output should contain ANSI escape codes")
+			} else {
+				assert.Check(t, !hasAnsi, "Output should not contain ANSI escape codes")
+			}
+		})
+	}
+}