Hi John,
there is no lower limit (apart from Double-precision limit 2^-1074 radians, approx. 3x10^(-321 degrees), but if you rotate by too small an angle, you won't see a difference due to rounding. If you have a float image with some off-center pixels having a value of 0, there is a tiny difference between the original and the rotated image even if you rotate by 0.000000000001 degrees.
The command recorder won't record more than 2 digits behind the decimal point, however (but a macro can rotate by a smaller angle).
Also the dialog remembers only 2 digits behind the decimal point (i.e., if you rotate by 0.001 degree, the next time you call Image>Transform>Rotate, the dialog will suggest a rotation angle of 0).
Michael
________________________________________________________________
On Dec 5, 2012, at 16:40, John Oreopoulos wrote:
> Hello, this is just a simple question about the Image->Transform->Rotate command. What is the smallest rotational increment (in degrees) that can be accepted by this command dialog?
>
> Thank you.
>
>
> John Oreopoulos
> Research Assistant
> Spectral Applied Research
> Richmond Hill, Ontario
> Canada
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