Photo Enhancer

Photo Enhancing at its best!

Enhance your photos: Adjusting the histogram
The Black Level slider can be used to set the black level for the tone values. This means that all truly black pixels in the image are given this value. The overall effect on the image is that it becomes fainter, i.e. the contrast is reduced. The standard setting is 0, i.e. completely black.

The range of the tone values can be set via the Tone Value Range. The range can be set at both ends - on the left the dark values, on the right the light values. Thus if an image is underexposed, the right hand slider can be moved to the left (and as necessary the left hand slider to the right) until the tone values are spread throughout the image and the brightness is optimized. In this example the values of the tone value range are set to 4 to 174.

To take account of the fact that the human eye reacts with greater sensitivity in the darker range than in the lighter one, the center slider (gamma) can be used to shift the tone values in a non-linear way. When values greater than 1 are set the darker tones are more strongly accentuated than the lighter ones. For values less than 1 the darker tones are reduced more than the lighter ones.

The White Level slider is used to adjust the white level for the tone values, i.e. all purely white pixels are set to this value. Here, too, this manipulation reduces the contrast of the image. The standard setting is 0, i.e. completely white.

The RGB-Max function causes an automatic distribution of each channel individually.

Y-Max spreads all channels by the same degree so that the brightness is extended to the greatest possible area. This function corresponds with the Automatic RGB Contrast.

The functions described above apply to the brightness channel and all color channels, whereby the color channels influence each other. For instance, if the brightness of the red channel is reduced, this has the effect of accentuating the green and blue colors. Thus it is possible to alter the colors very specifically.


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