Why is there distortion in Perspective Crop?

Here are two crops of a banal subject, our dryer and its circular control knob.  Both done the same way, but look at the difference.  First result, with size 1876x1419, which is reduced  for this post, is obviously a distortion:
I wasn't surprised or upset to see this distorition, since I'd seen it many times before.  It's easy enough to remedy: just Perspective Crop again.  This time the image was 1871x1000, which is much better:
Photoshop, we have a problem!  Why can't this be corrected?

I'm not sure whether that curvature distortion discussed in the other thread bears on why the perspective crop often leaves an image with a distorted H to W ratio.
One thing's clear:  There's unknown magic at work.
Adobe knows about the problem in the other thread, I've made sure.
-Noel

Similar Messages

  • I am using Illustrator CS6 (Mac). I am using free transform tool. Why can't I use Shift Option Command to distort in perspective?

    I am using Illustrator CS6 (Mac). I am using free transform tool. Why can't I use Shift Option Command to distort in perspective?

    hong,
    You need to ClickDrag just a tiny bit, then apply the Shift Option Command.

  • Why did you omit the perspective check box in the crop tool?

    I used the perspective frequently because I have sciolosis & most of my photos are askew. that easy checkbox was very convenient.

    Perspective Cropping is now its own tool, right under the Crop Tool in the Tools Bar.
    Here's a video: http://iceflowstudios.com/2012/tutorials/photoshop-cs6-beta-perspective-crop-tool/

  • Crop tool prior to CS6 vs perspective crop tool

    In the old days, one could just use the crop tool and, while drawing crop lines, check the perspective box if you found that you needed to change the perspective. With CS6 if you start with the crop tool, and find you want to change the perspective, you have to change tools to the new perspective crop tool. In the process, you have to tell the newly opened dialog box that you don't want to crop, to get to the perspective tool, which now has reset to its defaults. You've lost your cropping and you have to start over.
    Is this the correct behavior, or am I missing something?
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    Stan Rowin wrote:
    And as far as I can tell, even if you set the perspective crop tool to constaints, like 8x10", those constraints are totally ignored, even if you use the shift key. All of these features did work with the old crop tool.  And if you wanted to change the perspective, all you had to do was click a button. It seems like we have taken one step forward, and two steps back.
    The W and H are not intended to be constraints on the source aspect ratio. They are for optionally specifying the destination dimensions.
    Perspective Crop Tool is a specialised tool that the designers never will have intended to be used as an alternative to a non-distorting cropping tool.
    The user is expected to be sourcing a non-rectangular quadrilateral that's to be distorted into a rectangle, so there is no reason for the tool to feature an aspect ratio constraint for the source region.
    I'm not saying that you shouldn't have the option of the CS5-style crop tools in CS6. I am only saying that I can understand why the new PCT doesn't have the same features as a regular crop tool.

  • Suggested Enhancement to Perspective Crop

    The new Perspective crop tool in Photoshop CS6 Beta is great. I find it very useful for correcting the perspective when I take pictures of my paintings. I try to shoot them the straightest I can, but there is always some distortion so with previous versions I had to crop the image to the rectangle that confined the painting and then select all, transform and pull the corners with CTRL to match the corners of the painting to the corners of the image. Even then, I was not sure the image had the correct aspect ratio since it was made by hand.
    Perspective crop makes all this in just one step and calculates the correct aspect ratio but I think It can be enhanced a little more.
    Just look at this picture:
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    But there is still some distortion after the cropping. I tried all distortion filters and lens correction, but no help since they are oriented to straighten curved walls due to lens distortion, not really curved walls. The only helpful tool was Warp Transform:
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    But, ¿Wouldn't it be great if in the Perspective Crop you could just pull the side handlers (marked as 1 and 2 in the following mock up) of the mesh with CTRL pressed to do something like this?:
    Just think of the possibilities! One of the uses of the perspective crop you mention in the previews in Youtube is to obtain textures for a 3D object. Well, this is good when the texture is from a flat surface but what about cylindrical or spherical surfaces? you could photograph them and extract textures ready to apply to cylindrical or spherical 3D objects!

    Just in case you hadn't realised , the perspective crop tool is available in CS5.  It's just not so obvious.
    In CS5 draw out a crop box - and then look at the options bar. You'll see a checkbox labeled 'persective crop'. Tick it and you'll be able to pull the corners independently.
    I like your idea for the extraction on curved surfaces. I've had to do the same work myself in the past - perspective cropping images for 3D textures.
    I think with the new technologies for adaptive wide angle, lens correction etc, your idea might well be possible.

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  • Photoshop perspective crop tool  not working

    I have photoshop CS6 and used to use the perspective crop too all the time, and it worked just fine. Occasionally I would get weird results but if I just redid it, it would work properly.
    lately, it give weird results ALL THE TIME. My only workaround has been to take the result into genuine fractals and redo the image dimensions. The best way to describe what is happening is that while applying the correction, the program inverts the image dimensions so that a horizontal image becomes a vertical image, all squished from side to side and elongated from top to bottom.
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  • Crop tool/perspective crop difficulties...

    I've been using CS6 for a little while, and like many others (and UNLIKE many), I'm not happy with the changes to the crop tool...  I found a number of discussions about the crop tool, but none appeared to address my simple difficulties...
    In past versions I created presets - for example, 1024x768x72ppi or 14 in x 11 in x 240 ppi.  I could very quickly apply a preset, and if my image was vertical instead of horizontal, I simply clicked the arrows between horizontal and vertical dimensions to switch the dimensions.  This capability appears to be gone from the CS6 crop tool.  How do I switch the dimensions in CS6?
    And, no, the perspective crop tool isn't an adequate replacement.  I can't find ANY way to do presets in that tool.  Nor do I seem to be able to find a setting to show the "rule of thirds" on the perspective crop.
    Was this thing changed just for the sake of change, or is there some SIGNIFICANT improvement somewhere in the tool that's not intuitively obvious to the uninformed observer?

    OK, I AM the dumbest human ever!  I could SWEAR I tried every button and switch and whatever on the crop tool.  But, it does indeed work as you said......
    Now I have a DIFFERENT problem....  I"ve gotta relearn how to crop to a size since it appears that selecting the 8.5x11 for example, does NOT give me an image size of 11 inches times the default resolution...  Another thing that's been consistent for X versions that I'll have to relearn...  Are you guys SURE the Adobe people didn't just change the way a bunch of this stuff works for giggles?

  • Is there any way to crop in Illustrator?

    I feel like this ought to be a simple process but I can't figure out how to crop an image in Illustrator. Do I need to crop the image in a different program and then bring it into Illustrator, or is there a way to crop in Illustrator? Sorry if this is a dumb question with a really obvious answer I am missing.

    bilboleo wrote:
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    I would like to think that some of these discussions about what can't be done in Illustrator get back to the developers so they can improve their product, thus the explanation here. Cheers
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