**sqrt**- take square-root of TOS image with sign preserved. Applied to probalitiy or ``frequency" image (ie: one with Poisson characteristics) this will result in an image which has uniform random noise (Tina memo 2001-001).**csqrt**- complex square-root of TOS.**sqr**- take square of TOS image.**log**- take logarithm of TOS. Applied to an image which has errors proportional to data value this will result in an image which has uniform random noise.**exp**- exponentiate TOS.**sin**- take trigonometric sine of TOS.**asin**- take trigonometric inverse sine of TOS. Applied to an image with binomial error distribution this will result in an image with uniform random noise (Tina memo 2002-007).