Instruction manual

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The three dragable triangles below the histogram work as follows:
• Dragging the left (black) triangle to the right darkens the shadows
• Dragging the right (white) triangle to the left lightens the shadows
• Dragging the middle triangle (gamma) to the left or right lightens or
darkens the image
The two dragable triangles below the Output Levels grayscale bar also
adjust the image, having almost the opposite effect of the triangles above.
• Dragging the left (black) triangle to the right lightens the shadows
• Dragging the right (white) triangle to the left darkens the highlights
First, make sure the “Preview” checkbox is checked. To make
corrections, drag the left slider rightwards to the point where it meets the end
of the graph. You will see the change as you move the slider. If present, the
photographer can tell you if the image now matches what he saw when he
took the photo.
In the example below, we see a photo with its histogram displayed. Note
that the photo is slightly overexposed (the curve drops off before reaching the
left side of the graph, indicating that there are few pixels with very dark
colors).