Use A Script To Create An Image Stack - Adobe Photoshop CS6 User Manual

Kurtosis
Maximum
Mean
Median
Minimum
Range
Skewness
Standard Deviation
Summation
Variance
Remove stack rendering
Choose Layers > Smart Objects > Stack Mode > None to remove any rendering from an image stack and convert it back to a regular Smart
Object.
Edit an image stack
Because an image stack is a Smart Object, you can edit the original images that make up the stack layers at any time.
Choose Layer > Smart Objects > Edit Contents, or double-click the layer thumbnail. After you save the edited Smart Object, the stack is
automatically rendered with the last rendering option applied to the stack.
Convert an image stack
To preserve rendering effects on an image stack, convert the Smart Object to a regular layer. (You can copy the Smart Object before converting,
in case you want to later re-render the image stack.)
Choose Layer > Smart Objects > Rasterize.

Use a script to create an image stack

You can use the Statistics script to automate creating and rendering an image stack.
1. Choose File > Scripts > Statistics.
2. Choose a stack mode from the Choose Stack Mode menu.
3. Apply the stack mode to currently open files, or browse to select a folder or individual files.
Files you select are listed in the dialog box.
4. If desired, select Attempt To Automatically Align Source Images (equivalent to choosing Edit > Auto-Align Layers). Then click OK.
Photoshop combines the multiple images into a single multilayered image, converts the layers into a Smart Object, and applies the selected
stack mode.
More Help topics
kurtosis = ( sum( (value - mean) ) over
non-transparent pixels ) / ( ( number of
non-transparent pixels - 1 ) * (standard
4
deviation) ).
The maximum channel values for all non-
transparent pixels
The mean channel values for all non-
transparent pixels
The median channel values for all non-
transparent pixels
The minimum channel values for all non-
transparent pixels
Maximum minus the minimum of the non-
transparent pixel values
skewness = (sum( (value - mean) ) over
non-transparent pixels ) / ( ( number of
non-transparent pixels - 1 ) * (standard
3
deviation) )
standard deviation = Square
Root(variance)
The sum channel values for all non-
transparent pixels
variance = (sum( (value-mean) ) over
non-transparent pixels ) / ( number of non-
transparent pixels - 1)
4
A measure of peakedness or flatness
compared to a normal distribution. The
kurtosis for a standard normal distribution
is 3.0. Kurtosis greater than 3 indicates a
peaked distribution, and kurtosis less than
3 indicates a flat distribution (compared to
a normal distribution).
Effective for noise reduction
Effective for noise reduction and removal
of unwanted content from the image
3
Skewness is a measure of symmetry or
asymmetry around the statistical mean
2
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