Photomerge panorama problems
in [Digital Cameras]
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From: Lobster on 12 Mar 2010 14:47 I've been playing around with the 'photomerge' function in Photoshop Elements, attempting to take a wide-angle-type view of a room. Not having done this before, I stuck my camera on a tripod, which I then levelled as best I could using the built-in spirit leveled) and then rotated the camera to 'portrait' mode. The plan was to do three 'pans' of the room at high., medium and low level, and then merge the results to produce a single photo which could be cropped accordingly. However, the results are hopeless, as you can see from the results of the pan at 'middle' height uploaded below. Ignoring other issues for now, the perspective is all wrong - why is this? Is it simply due to inaccurate leveling of the tripod or am I doing something else wrong? If it's a leveling error, it must be so sensitive that I'm not sure how to get it accurate enough to generate satisfactory photos. http://img641.imageshack.us/img641/1228/panoramah.jpg Thanks for any tips. David
From: Chris Malcolm on 12 Mar 2010 15:02 Lobster <davidlobsterpot601(a)hotmail.com> wrote: > I've been playing around with the 'photomerge' function in Photoshop > Elements, attempting to take a wide-angle-type view of a room. > Not having done this before, I stuck my camera on a tripod, which I then > levelled as best I could using the built-in spirit leveled) and then > rotated the camera to 'portrait' mode. The plan was to do three 'pans' > of the room at high., medium and low level, and then merge the results > to produce a single photo which could be cropped accordingly. > However, the results are hopeless, as you can see from the results of > the pan at 'middle' height uploaded below. Ignoring other issues for > now, the perspective is all wrong - why is this? Is it simply due to > inaccurate leveling of the tripod or am I doing something else wrong? > If it's a leveling error, it must be so sensitive that I'm not sure how > to get it accurate enough to generate satisfactory photos. > http://img641.imageshack.us/img641/1228/panoramah.jpg Looks like the photomerge function expects you to do all the perspective adjustments and edge matching by yourself first. There's plenty of good panorama software which will have a good go at doing that automatically. Hugin, for example, does that, and is free. -- Chris Malcolm
From: Vance on 12 Mar 2010 15:14 On Mar 12, 11:47 am, Lobster <davidlobsterpot...(a)hotmail.com> wrote: > I've been playing around with the 'photomerge' function in Photoshop > Elements, attempting to take a wide-angle-type view of a room. > > Not having done this before, I stuck my camera on a tripod, which I then > levelled as best I could using the built-in spirit leveled) and then > rotated the camera to 'portrait' mode. The plan was to do three 'pans' > of the room at high., medium and low level, and then merge the results > to produce a single photo which could be cropped accordingly. > > However, the results are hopeless, as you can see from the results of > the pan at 'middle' height uploaded below. Ignoring other issues for > now, the perspective is all wrong - why is this? Is it simply due to > inaccurate leveling of the tripod or am I doing something else wrong? > If it's a leveling error, it must be so sensitive that I'm not sure how > to get it accurate enough to generate satisfactory photos. > > http://img641.imageshack.us/img641/1228/panoramah.jpg > > Thanks for any tips. > > David What focal length lens/zoom setting were you using? Where in the room did you setup? Dimensions of the room? Vance
From: Draco on 12 Mar 2010 15:21 On Mar 12, 2:47 pm, Lobster <davidlobsterpot...(a)hotmail.com> wrote: > I've been playing around with the 'photomerge' function in Photoshop > Elements, attempting to take a wide-angle-type view of a room. > > Not having done this before, I stuck my camera on a tripod, which I then > levelled as best I could using the built-in spirit leveled) and then > rotated the camera to 'portrait' mode. The plan was to do three 'pans' > of the room at high., medium and low level, and then merge the results > to produce a single photo which could be cropped accordingly. > > However, the results are hopeless, as you can see from the results of > the pan at 'middle' height uploaded below. Ignoring other issues for > now, the perspective is all wrong - why is this? Is it simply due to > inaccurate leveling of the tripod or am I doing something else wrong? > If it's a leveling error, it must be so sensitive that I'm not sure how > to get it accurate enough to generate satisfactory photos. > > http://img641.imageshack.us/img641/1228/panoramah.jpg > > Thanks for any tips. > > David Hello David, From my point of view, it looks like you didn't swivel on the lens nodel point. This is where the light come to a point in the lens before it "widens" again to cover the "film plane" or digital sensor. It will give a tilt to the image and distort the panorama. Also you should over lap each shot by at the least 1/3 of the frame. This will give you and the program more to work with in aligning the images. Good luck and keep shooting. Draco
From: Paul Furman on 12 Mar 2010 15:29
Chris Malcolm wrote: > Lobster<davidlobsterpot601(a)hotmail.com> wrote: >> I've been playing around with the 'photomerge' function in Photoshop >> Elements, attempting to take a wide-angle-type view of a room. > >> Not having done this before, I stuck my camera on a tripod, which I then >> levelled as best I could using the built-in spirit leveled) and then >> rotated the camera to 'portrait' mode. The plan was to do three 'pans' >> of the room at high., medium and low level, and then merge the results >> to produce a single photo which could be cropped accordingly. > >> However, the results are hopeless, as you can see from the results of >> the pan at 'middle' height uploaded below. Ignoring other issues for >> now, the perspective is all wrong - why is this? Is it simply due to >> inaccurate leveling of the tripod or am I doing something else wrong? >> If it's a leveling error, it must be so sensitive that I'm not sure how >> to get it accurate enough to generate satisfactory photos. > >> http://img641.imageshack.us/img641/1228/panoramah.jpg > > Looks like the photomerge function expects you to do all the > perspective adjustments and edge matching by yourself first. There's > plenty of good panorama software which will have a good go at doing > that automatically. Hugin, for example, does that, and is free. Autostitch is another. Here's an example showing each frame bent to fit, versus your example with square edges: http://eric.jain.name/wp-content/uploads/2006/04/sunshine.jpg Also, for that kind of indoor shot with lots of depth, you may need to get a pano head to allow precise rotating about the nodal point. That becomes more essential when you have foreground elements that could cause parallax errors. Probably not a big problem for the shot you showed but could be an issue for similar shots. |