DPChallenge: A Digital Photography Contest You are not logged in. (log in or register
 

DPChallenge Forums >> Individual Photograph Discussion >> New photo. Like it?
Pages:  
Showing posts 1 - 5 of 5, (reverse)
AuthorThread
12/21/2005 04:00:59 PM · #1
I have always wanted to take a pic like this of a farris wheel, the stars look like sparks to me.
12/21/2005 04:05:30 PM · #2
Great shot Ty.
12/21/2005 04:36:07 PM · #3
I like this a lot in almost allw ays. One thing that bothers me, though; you're using wide angle and pointing the camera up, so you have squished the perspective on the wheel to an oval. I did a quick fix for you: I went to "image/canvas size" and added 50 pixels to the top, then I went to "edit/ree transform" and stretched the image vertically to make the wheel round again. Also used step interpolation to increase the size to 640 wide.



Robt.
12/21/2005 04:46:01 PM · #4
Oh thats cool! I understand the perspective adjustment. Pardon my ignorance but what is interpolation? Thanks

Green
12/21/2005 04:55:56 PM · #5
Originally posted by GreenGiant:

Oh thats cool! I understand the perspective adjustment. Pardon my ignorance but what is interpolation? Thanks

Green


If we want to make an image "bigger" than it actually is, we have to "invent" pixels to fill in the empty spaces as we stretch it. This is done by "interpolating" the value of a pixel-to-be-added by measuring the values of its neighbors. The software does this automatically when you resample to a larger pixel dimension. It can be done more smoothly by resizing upwards in small increments rather than all at once. That's "step interpolation".

You won't need to worry about it because you have the original to work on. You just posted a smaller-than-640-pixel image, and I wanted to stretch it to the maximum allowable DPC size, so I used step interpolation to do this.

In case you don't understand the word "interpolation", it basically means "to fill in the blanks logically"; if you give me the series "1,3,5,7,9" I can interpolate the values of the detailed string as "1,2,3,4,5,6,7,8,9", for example, while "1,22,3,44,5,66..." would make less sense and "1,8,3,6,5,4..." would make no sense.

Robt.
Pages:  
Current Server Time: 09/21/2025 04:45:15 PM

Please log in or register to post to the forums.


Home - Challenges - Community - League - Photos - Cameras - Lenses - Learn - Help - Terms of Use - Privacy - Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 09/21/2025 04:45:15 PM EDT.