Take part of image under locator

Question

How to create Manipulator with Locator to take part of an image?

enter image description here

Perhaps you could expand your question to include this information... This will also help to avoid this question being closed as a duplicate... — cormullion, Dec 11 '12 at 13:28

score 2 · Answer 1 · answered Dec 11 '12 at 18:09

2

Of course, this is completely automatic in version 9. If we Import your image and just click on it, we get easy access to a crop tool, as well as others. It looks something like so:

enter image description here

Here's the cropped image:

enter image description here

answered Dec 11 '12 at 18:09

Mark McClure

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that is a nice addition in 9. – Mike Honeychurch Dec 11 '12 at 20:54
@Elfet Just out of curiosity - why the down vote? – Mark McClure Dec 12 '12 at 19:31

score 2 · Accepted Answer · answered Dec 11 '12 at 21:34

One way that Manipulate[] can control the portion of the selected image with a locator is:

img = ExampleData[{"TestImage", "Mandrill"}];
{dR, dC} = ImageDimensions[img];
Manipulate[
  Show[img, 
    ImageTake[img, {dR-50-p[[2]], dR+50-p[[2]]}, {p[[1]]-50,p[[1]] + 50}]], 
{{p, {dR/2, dC/2}}, Locator}]

This lets you scan around, zooming into the image. Control the size by the integers inside ImageTake[] (set to 50 here).

Take part of image under locator

2 Answers2