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Chapter 16 — Photo Info | Watch Points 153
To use the Double Threshold feature, follow these steps:
e Clear
Press the Clear button to clear ranges added to the histogram or the values set for the shadows and
highlights sliders of the Double Threshold option.
Watch Points
The “Watch Points” section of the Photo Info palette displays the position and color of the pixel under the
mouse pointer.
A Please note: Values for the different channels range from 0 to 255, with values for 12 and 16-bit images being
scaled to fit into this range.
1
Enable the Double Threshold checkbox within the “Histogram” section of the Photo Info palette.
2
If no black pixels appear in the image, slowly drag the shadows slider to the right. Once you notice
black pixels appearing, release the mouse button. If large groups of black pixels are displayed, try
moving the slider back to the left slightly. It is recommended that you find a value for the shadows
slider as close as possible to where the first black pixels appear.
3
Then, if no white pixels appear in the image, slowly drag the highlights slider to the left. Once you
notice white pixels appearing, release the mouse button. If large groups of white pixels are
displayed, try moving the slider back to the right slightly. It is recommended that you find a value
for the highlights slider as close as possible to where the first white pixels appear.
4
Your image now shows the lightest and darkest pixels. This feature is typically used to assist you
with finding those pixels for placing white and black points (either control points or points from
within the Levels & Curves feature). After placing white and black points, disable the Double
Threshold checkbox to continue working on your image.
Shortcut
Toggle the Double Threshold option on
and off: Shift + T