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DPChallenge Forums >> Current Challenge >> Perspective Compression????Do Whaaaaaaaaaaaaaaaat?
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03/30/2019 10:58:13 PM · #1


What????

Book For Dummies.

21_F.gif JulietNN <~~~~~ Dummy
03/30/2019 11:42:43 PM · #2
I think this means the visual tricks, such as someone dribbling a basketball that is really the sun, or trying to straighten the leaning tower of Pisa.
03/31/2019 01:04:23 AM · #3
Consider looking down a crowded city street with traffic in the road and many buildings and signs on either side along multiple blocks. When you stand close, the near objects appear well-separated from the objects further away. If you take a picture with a lens wide enough to get both sides of the street, the separation of objects along the depth axis will be obvious in the image. If you stand many blocks further away, those same buildings and signs and vehicles will look more bunched together along the depth axis. If you take a picture from there with a lens long enough to have about the same field of view (both sides of street), the image will show that effect of the objects appearing somewhat compressed together along the depth axis. Many photographers would count that effect as an instance of "perspective compression."

Interestingly, from that same position at the further distance, you could also use a non-telephoto lens, capture the scene in a wider image, and then crop to get the same field of view. The end result would still produce the same “compression effect,” but you would have much less resolution to work with after cropping.

Imprecise language leads some to think that longer lenses inherently compress depth perspective. But distance to the objects is actually what makes the effect happen. Using a long lens is just a good way to end up with adequate resolution when making such images.

03/31/2019 05:39:43 AM · #4
What is the difference to "forced perspective" then?
I think that is what 21.gif Yo_Spiff described
03/31/2019 09:58:03 AM · #5
Originally posted by primabarbara:

What is the difference to "forced perspective" then?
I think that is what 21.gif Yo_Spiff described

It's NOT a forced perspective challenge.

Here's a good discussion of it.

Message edited by author 2019-03-31 09:59:05.
03/31/2019 10:12:44 AM · #6
Where is the discussion from before it was chosen as a challenge topic?
03/31/2019 11:06:57 AM · #7
Originally posted by Bear_Music:

It's NOT a forced perspective challenge.

OIC. But one of the examples in that article was exactly what I had described: a shot of a man holding the sun on his shoulders. So my thought was at least a subset of the concept if not the only way of implementing it.
03/31/2019 11:18:08 AM · #8
We had a similar challenge before - I remember some clever examples. I may be wrong in my interpretation. But can someone please link to that old challenge?
03/31/2019 11:46:24 AM · #9
Originally posted by Bear_Music:

Originally posted by primabarbara:

What is the difference to "forced perspective" then?
I think that is what 21.gif Yo_Spiff described

It's NOT a forced perspective challenge.

Here's a good discussion of it.


Thank you Robert!
I read that article you linked but I still don't get it (might be my poor English or just regular obtuseness). Didn't the author of the article at fstoppers himself state that lens compression doesn't exist?

My main concern is that shooting for that challenge is kind of difficult… I could shoot almost anything because voters would never know how far away the background from my main subject was and therefore can't gauge how good my entry fits into the challenge. Actually I have no idea how to accomplish that without staging a reference - which means it might count as a forced perspective and a dnmc.
Where is my logical fallacy?
03/31/2019 11:57:55 AM · #10
Originally posted by primabarbara:


My main concern is that shooting for that challenge is kind of difficult… I could shoot almost anything because voters would never know how far away the background from my main subject was and therefore can't gauge how good my entry fits into the challenge.

I had the same thought. It may be like a lot of challenges, where the meeting of the topic is on the honor system.
03/31/2019 12:23:03 PM · #11
I believe the change talks about this kind of photograph

03/31/2019 12:48:11 PM · #12
Originally posted by pgirish007:

I believe the change talks about this kind of photograph
Is this the lens being physically compressed/melted by the heat of the sun? ;)

The article mentioned by Bear made me think bokeh but then photography in general is about compressing 3D into 2D so effectively every photograph with multiple layers shows a compressed scene.

Any other ideas?
03/31/2019 01:13:08 PM · #13
I think this may be an example of one way to demonstrate the topic: here.
04/01/2019 09:33:27 PM · #14
21.gif bob350 ohh those are fantastic!

It seems it is still as clear as mud though for some.

I went back 30 pages of challenge suggestions and could not find this one (probably missed it on the 1st page) to ask if the original poster of this challenge would explain. But nada =(
04/10/2019 03:09:54 AM · #15
It must be something similar to "Relative Humidity" ;). No, that is probably Forced Compression then.
Ha ha ha just joking lol but here is a nice example of perspective compression that makes it clear what it is.
https://imgur.com/a/dEZAGDM

Message edited by author 2019-04-10 03:18:44.
04/10/2019 05:29:12 AM · #16
I was thinking it was something along these lines but perhaps I am way off mark

Copyrighted_Image_Reuse_Prohibited_1235459.jpg
04/10/2019 08:58:54 AM · #17
Originally posted by P-A-U-L:

I was thinking it was something along these lines but perhaps I am way off mark

Copyrighted_Image_Reuse_Prohibited_1235459.jpg

Originally posted by Bear_Music:

It's NOT a forced perspective challenge.

Here's a good discussion of it.
04/10/2019 09:13:04 AM · #18
Originally posted by GeneralE:

Originally posted by P-A-U-L:

I was thinking it was something along these lines but perhaps I am way off mark

Copyrighted_Image_Reuse_Prohibited_1235459.jpg

Originally posted by Bear_Music:

It's NOT a forced perspective challenge.

Here's a good discussion of it.


Thanks Paul
04/10/2019 08:53:08 PM · #19
I am so sitting this one out.
04/10/2019 09:27:10 PM · #20
Originally posted by P-A-U-L:

Originally posted by GeneralE:

Originally posted by P-A-U-L:

I was thinking it was something along these lines but perhaps I am way off mark

Copyrighted_Image_Reuse_Prohibited_1235459.jpg

Originally posted by Bear_Music:

It's NOT a forced perspective challenge.

Here's a good discussion of it.


Thanks Paul


Nope, that's "forced perspective".

Perspective compression is when, for example, you take a photo of layers of mountains with a telephoto, and they look like they're much closer to each other than they really. It's more about appearing to reduce the distance between objects, than about the relationship between objects.
04/11/2019 03:19:35 AM · #21
Thanks Johanna - that is a good explanation. Now lets see if I can find anything to shoe horn:)
04/11/2019 04:13:32 PM · #22
I'm too thick to think about this, anyway any entry from me would only earn me a DQ.!!!
04/11/2019 06:07:59 PM · #23
Does the term foreshortening describe this phenomenon as well?
04/11/2019 07:13:16 PM · #24
Originally posted by NikonJeb:

Does the term foreshortening describe this phenomenon as well?


Yes
04/11/2019 07:37:34 PM · #25
I submitted mine so let's see how it does :D
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