How do I stop a straight edge from curving?
- Thread starter sarahjc
- Start date
alet
Suspended / Banned
- Messages
- 265
- Edit My Images
- Yes
Hello Sarah, and welcome to the forum.
From the information you have given it sounds like it might be lens distortion (the other possibility is that the camera and artwork is not aligned perfectly, but I assumed you would have noticed this
). This issue is quite common, and it means that rectangular objects can appear pincushion shaped or barrel shaped.
My preferred solution to this problem is to shoot in Raw and then use Adobe Camera Raw (comes with Photoshop) to correct the distortion, which straightens the lines nicely. I am not familiar with your camera model but it may be worth investigating whether the software you use has a similar feature.
From the information you have given it sounds like it might be lens distortion (the other possibility is that the camera and artwork is not aligned perfectly, but I assumed you would have noticed this
). This issue is quite common, and it means that rectangular objects can appear pincushion shaped or barrel shaped.My preferred solution to this problem is to shoot in Raw and then use Adobe Camera Raw (comes with Photoshop) to correct the distortion, which straightens the lines nicely. I am not familiar with your camera model but it may be worth investigating whether the software you use has a similar feature.
Suvv
Suspended / Banned
- Messages
- 2,955
- Name
- Kev
- Edit My Images
- No
Welcome to TP 
If it is lens distortion and you have not got any software to correct it you could try shooting from a greater distance and then cropping if needed to remove any background.
The distortion is usually worse at short focal lengths and at the edges.
If it is lens distortion and you have not got any software to correct it you could try shooting from a greater distance and then cropping if needed to remove any background.
The distortion is usually worse at short focal lengths and at the edges.
Last edited:
Terrywoodenpic
Suspended / Banned
- Messages
- 8,172
- Name
- Terry
- Edit My Images
- Yes
Have a look at the PTlens site.
http://www.epaperpress.com/ptlens/
It has auto correction for the canon G11, But you will probably need to correct for perspective too ... It can do this as well.
You can download the trial version. But I bought the full version years ago and updated for free ever since. It is well worth having.
You can also use PTLens through lightroom and Photoshop as per this video example ( every thing he demonstrates can be done in the stand alone application.)
http://www.youtube.com/watch?v=gZZsG9hWfEE
http://www.epaperpress.com/ptlens/
It has auto correction for the canon G11, But you will probably need to correct for perspective too ... It can do this as well.
You can download the trial version. But I bought the full version years ago and updated for free ever since. It is well worth having.
You can also use PTLens through lightroom and Photoshop as per this video example ( every thing he demonstrates can be done in the stand alone application.)
http://www.youtube.com/watch?v=gZZsG9hWfEE
Last edited:
Ulfric M Douglas
Suspended / Banned
- Messages
- 2,138
- Edit My Images
- Yes
Zoom yer lens out and take the pic from as far away as it still fills enough of the frame.
You might not then need to use any postprocessing to straighten them.
You might not then need to use any postprocessing to straighten them.
HoppyUK
Suspended / Banned
- Messages
- 23,200
- Name
- Richard
- Edit My Images
- No
As above, it's lens distortion. G11 has lots of barrel at the wide end, but is just about perfect at the long end of the zoom. So that's option one.
The other is to correct in post processing. Quite a few software programmes include distortion correction, the most obvious being Canon DPP that comes free with the camera.
The other is to correct in post processing. Quite a few software programmes include distortion correction, the most obvious being Canon DPP that comes free with the camera.
