Perspective correction in 8-bit images?

[monelle]

What is an 8-bit mode image? I found a very neat little explanation of how to

correct architectural perspective in Photoshop at

http://www.outbackphoto.com/workshop/PSPerspectiveCorrection/PhotoshopPerspectiveCorrection.html. However, he says the image as to be in 8-bit mode. So I

took a photo with my Nikon D80 and it worked just fine. Took another one a

few minutes later, and now almost all the "Edit" menu was grayed out,

including "Transform," where the process starts. What did I do wrong? :(

[Ed_Ingold]

Which version of Photoshop do you have? You can Edit/Transform a 16-bit image, but you have to select something first (e.g., ctl-a for all).

[colinsouthern]

Normally you'd just go to Filter -> Distort -> Lens Correction - in CS2 it'll work just fine on 8 & 16 bit images.

[Ed_Ingold]

The proper tool is "Perspective" transformation, or possibly "Free" transformation. Lens distortion is curvature, not perspective.

[pascal_despeaux]

I suppose this post is old and speak about an old version of Photoshop where some

transformation was only possible in 8bit. (Photoshop 7 for example).

[colinsouthern]

Edward Ingold wrote: "Lens distortion is curvature, not perspective."

 

Filter -> Distort -> Lens Correction does both in CS2.

[Brad_]

I just drag a crop rectangle and move the corners till the crop edge is parallel with an object I

want straightened - much easier - takes a couple seconds...

 

May not be available in older versions of ps.