Colors

Options > Colors… opens one dialog for all the colors of the comparison panes. Each row is one kind of line, with a swatch for its text color and one for its background:

Normal	lines that are the same on both sides
Difference	lines that differ
Inline difference	the changed part inside a different line (see Show Inline Differences)
Modified	lines you edited in this session

Click a swatch to open the Windows color picker for that color. The Preview box shows sample lines in the current screen font and follows every change immediately. Nothing is applied to the comparison until you press OK; Cancel leaves the colors as they were.

Contrast

The Contrast column shows the contrast ratio between text and background of each pair, as defined by the WCAG accessibility guidelines. A pair below 4.5 : 1, the ratio recommended for running text, is flagged, and the line under the table names the pairs concerned. This is a hint, not a lock: you can apply such a combination anyway. The factory setting for the inline difference, red on yellow, is itself below the line (3.7 : 1) — it is carried by the hue rather than by brightness, and it is kept that way on purpose.

Presets

Light — the factory colors: black on white, black on yellow for differences, red on yellow for the inline part, black on cyan for modified lines.
High contrast — white on black for common text, the familiar yellow and cyan blocks for differences and modified lines, and white on dark red for the inline part. Every pair of this preset is above 4.5 : 1.
Restore Defaults — the same as Light.

A preset only fills the editor; press OK to apply it.

Notes

The colors are saved with your other settings and are back the next time you start the program.
The editor sets the screen colors. Printing falls back to the light factory colors whenever the normal background is dark, so a dark preset still prints on white.
The blank filler lines shown opposite an inserted block use the system’s inactive-caption color and are not part of this dialog.

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