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Syntax

procedure DuotonePdfBitmap(Bitmap: TBitmap; DarkColor, LightColor: TColor);

The helper forces pf32bit and updates ScanLine pixels directly, so it works after RenderPage or ToBitmap without an extra staging buffer

Use these helpers before displaying, saving, or exporting the rendered bitmap when the reader needs a low-vision colour mode

This is a pure helper and does not require an active component instance
API names, type names, and PDF terms keep their original spelling so code search remains reliable

Bitmap := Pdf1.RenderPage(0, 0, Width, Height);
DuotonePdfBitmap(Bitmap, clBlack, $00D8E8FF);