How to draw a diagonal straight line and mirror copy one half of the two Triangles?

I have a square image.  I want to do a straight diagonal line from the top left to the bottom right.  That would then leave me with two triangles.  I then want to mirror image of the right lower left triangle at the upper triangle.  Any way to do it?  Thanks much appreciated.

There are still a number of ways to do anything.  Here's a simple to do what you want:

1 activate the Polygonal Lasso tool and check the feathers and the settings for anti-aliasing at the top of the main window of Photoshop.

2. click on a corner of the image where the diagonal must begin in the vicinity.

3. click on just outside the other corner.  You will now have a diagonal line of the selection in the image.

4 fill the selection by clicking outside of the picture on the side and bottom, and by clicking on the original that you clicked in step 2.

5. you have now a half diagonal of the selected image.

6 Edition - Copy, then Edition - paste.  You now have a copy of the diagonal part of the image as a new layer.

7. you can now rotate and/or return this copy diagonal as you want using Edit - Transform - xxxxx.

Note that the image must start on the spot to get a perfect diagonal mirror image.

-Christmas

Tags: Photoshop

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