Polaroid BLL Generator Manual do Utilizador descarregar pdf (Página 39)

40 Reference

Contrast Gamma

allows for very fine contrast adjustment. The range of valid gamma contrast values

is 0.14 to 7.0. However, values between 0.25 and 2.0 are usually more practical. By adjusting the

gamma contrast value you can change the midtones of the image without affecting the highlights. As

the gamma contrast value decreases, output midtones become darker. As the gamma contrast value

increases, output midtones become lighter.

The graph under the scroll bar for gamma contrast adjustment (only available in some dialogs) shows

how input intensities are mapped to output intensities. The horizontal axis represents input intensities

which increase from left to right. The vertical axis represents output intensities which increase from

bottom to top.

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Polaroid BLL Generator Manual do Utilizador Página 39