Red enhance method 1

Duplicate new layer, fill with BG colour and change mode

With Background copy#1 still selected click Duplicate to create a new layer.

duplicate bg copy 1

With the new Background copy#2 still selected, double click on the Background colour in the main GIMP toolbar and type in the hexadecimal code FF0000 (red) in the HTML Notation option box.

foreground colour button red foreground colour

On the image toolbar choose

Edit » Fill with BG Colour

fill layer with red

In the layers dialogue change Background copy#2 Mode from Normal to Multiply.

change mode (normal to multiply)

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