Getting clean lines with Photoshop pinch and stretch distortion

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DaveC426913
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I've spent hours on this and can't get it right.

I want to pinch and stretch a box like in the image using some combination of distortions.

I've tried Spherize, Liquify and Pinch but no combination of them will produce it accurately (I need clean lines).

Help!
 

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larkspur said:
Have you tried
Edit, Transform, Warp yet?

I don't have warp. Probably because I'm running v6.0.

But thanks. That may well be the answer, and I know people at ex-work who do have up-to-date versions.
 
Also, if you have specific curves in mind for the warp, you can have MathMap do the pixel motion for you. you can even see the effects of coordinate changes like this.
 
slider142 said:
Also, if you have specific curves in mind for the warp, you can have MathMap do the pixel motion for you. you can even see the effects of coordinate changes like this.
It doesn't have to be specific, no, it just has to be neat. i.e. not freehand lines.