Hello Stefan,  Just want to clarify. Am I right that your solution isn't applicable to PiecewiseAffineTransform at all?Do you think it may be possible to find a workaround?Thanks. Best regards, Serge Shakhov. On Wednesday, 5 April 2017, 10:46, Serge Shakhov via scikit-image <scikit-image@python.org> wrote: okay, but I don't need Affine.Does it mean that there is no solution for my problem? Best regards, Serge Shakhov. On Wednesday, 5 April 2017, 10:35, Stefan van der Walt <stefanv@berkeley.edu> wrote: Hi Serge There is no inverse defined for the piecewise affine, hence the change I made. Stéfan On Tue, Apr 4, 2017, at 15:28, Serge Shakhov wrote: Hi Stefan. Noticed that you changed my PiecewiseAffineTransform to AffineTransform. Is it applicable to PiecewiseAffineTransform?  When I tried to revert it back to PiecewiseAffineTransform Got error:  Traceback (most recent call last):   File "C:/Users/Serge/Downloads/warp_to_extents.py", line 45, in <module>     shifted_transform = (affine + offset).inverse   File "C:\Users\Serge\Software\lib\site-packages\skimage\transform\_geometric.py", line 208, in __add__     raise NotImplementedError() NotImplementedError Thanks    Best regards, Serge Shakhov. On Tuesday, 4 April 2017, 18:58, Stefan van der Walt <stefanv@berkeley.edu> wrote: Hi Serge Have a look at the attached version. Stéfan _______________________________________________ scikit-image mailing list scikit-image@python.org https://mail.python.org/mailman/listinfo/scikit-image