Calculator¶

Tools -> Calculator

The built in Calculator can perform simple calculations on image data by entering the desired formula into the Formula text box. For types of supported input and examples see Supported Formula inputs with examples. and for supported functions see Calculator functions.. These functions are also available for insert via the Functions combo box.

Clicking apply will create a new image with the name given in Name, if the name already exists then the image data will be overwritten. Non image results (e.g. the mean of an image) are displayed in the Results text box.

Supported Input¶

Supported Formula inputs with examples.¶
Type	Example
Image names	`P31` `153Eu/31P`
Mathematical Symbols	`+ - * / ^ ( )` `a / (b + 1)` `1e3 + P31`
If / then / else	`if P31 > 1e3 then P31 else 0` `Eu153 > P31 ? Eu153 : P31`
Functions	`threshold(P31, median(P31))` `if P31 > kmeans(P31, 3)[2] then P31 else nan`

Supported Functions¶

Calculator functions.¶
Function	Arguments	Result
abs	image	absolute values of image
kmeans	image, k	array of lower k-means bounds
mask	image, mask	selects from image using mask
mean	image	mean value of the image
median	image	median value of the image
nantonum	image	sets image NaN values to zero
normalise	image, min, max	image normalised to min, max
otsu	image	Otsu’s method of image
percentile	image, percentile	the percentile’th value of image
segment	image, threshold	creates a mask image of thesholds
threshold	image, value	sets all pxiels below value to nan