Thank you all very much for the responses! Yes, what I wanted to do was to
flip the volume of the map along the z-axis. Eleanor's solution worked
perfectly.
Best wishes and stay safe.
Em qua., 1 de abr. de 2020 às 10:56, Ian Tickle <ianj...@gmail.com>
escreveu:
>
> A file does not have a handedness, it's just a list of numbers. So the
> pedantic answer is that since it doesn't have a handedness you need do
> nothing to change it!
>
> I assume that what you mean is that you want to change the handedness of
> the _visual interpretation_ of the file. That's a different story
> altogether since it involves your own visual perception!
>
> Eleanor's trick with the phases will do it if you then view the map in the
> same way as you were doing before.
>
> Or you could keep the file the same and view a mirror image of the map.
> Eugene has already suggested using a mirror which reverses either the X or
> Y axis depending on where you place the mirror.
>
> The obvious and interesting alternative is to reverse the Z axis. In the
> days when we plotted maps on a stack of transparent sheets it was easy: you
> just reversed the order of the sheets! In fact you had to do exactly that
> since the plastic molecular model was viewed in a half-silvered mirror
> placed in front of the map ("Richard's box", a.k.a. "Fred's Folly":
> https://en.wikipedia.org/wiki/Frederic_M._Richards ).
>
> Now a computer screen being a 2-D object obviously doesn't have a Z axis
> so you can't reverse it! However we get the _impression_ of depth in our
> brain by using stereo or depth cueing, so you would need to reverse one of
> those (maybe a switch on the glasses controller?).
>
> Depth cueing is obtained by having objects that are supposed to be nearer
> to you brighter than ones that are supposed to be further away. So all
> need to do is convince your brain that the opposite is true!
>
> Note that all the solutions that reverse the image of the map will also
> reverse the image of the structure which may not be what you want. In that
> case Eleanor's solution which results in only reversing the image of the
> map is probably the right one.
>
> Oh and happy April 1st to all!
>
> Cheers
>
> -- Ian
>
>
> On Wed, 1 Apr 2020 at 13:56, Andre LB Ambrosio <an...@ifsc.usp.br> wrote:
>
>> Dear all,
>> is it possible to generate a mirror image of an existing .ccp4 map file?
>> Many thanks in advance.
>>
>> --
>> Andre LB Ambrosio
>>
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>
--
Andre LB Ambrosio
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