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Use the same process to colorize the letter with a parchment colour (hue=28, saturation=50).
Keep the letter selected and choose Colours - Adjust - Highlight, Midtone, Shadow from the menu bar. This function adjusts the luminance of an image or selection.

Highlight adds luminance proportionally. The lighter the pixels, the more luminance is added. Midtone shifts the middle of the luminance scale up or down. Shadow removes luminance proportionally. The darker the pixels, the more luminance is removed.

Set Highlight=93, Midtone=50 and the Shadow=0, and select OK.

This brightens the letter and draws a viewers attention to it in the image.