Problem with panoramics

[Michael Huang230209]

I tried my hands today on panoramics. So I took a few pics and tried to stitch them together in photoshop. All the pics were shot in RAW, tripod-mounted with remote control trigger. No post processing was done.

The final image didn't come out well because (1) the colors don't match and (2) overlapped subjects did not overlap seamlessly.

The only thing I can think of is that the changing light conditions rendered the color mismatch. I had set the camera WB to cloudy and did not change it.

With regards to problem (2), I am clueless.

Any help is greatly appreciated.

Michael

 

[nowhereatoll]

just meter on the main subject (if no main subject you will have to find one IMO) and shoot all the rest same setting. Use no auto anything. Alternatively use the exposure lock on same subject each shot and pan to new position in pano. Still the lens used may influence the iedges of the image (vingetting, distortion). Overlap more and cut 10% off each edge of each fram, sometimes that will help to equalize the images. In the end they wont be perfect anyway (contrast depending on flare or angle of sun), etc. Here is a demo:
http://www.pbase.com/nowhereatoll
click on the 'panorama demo' link.

I tried my hands today on panoramics. So I took a few pics and
tried to stitch them together in photoshop. All the pics were shot
in RAW, tripod-mounted with remote control trigger. No post
processing was done.

The final image didn't come out well because (1) the colors don't
match and (2) overlapped subjects did not overlap seamlessly.

The only thing I can think of is that the changing light conditions
rendered the color mismatch. I had set the camera WB to cloudy and
did not change it.

With regards to problem (2), I am clueless.

Any help is greatly appreciated.

Michael

--



http://www.pbase.com/nowhereatoll
http://www.nowhereatoll.com

 

[Adam Gardner]

Make sure you don't have a polarising filter on either. You probably don't, but if you normally use one you need to take it off.

 

[rtendyk]

I have been doing some panoramics lately, and here's what I do.

1. Open one of the scenes. Expand the canvas to provide room for a second scene.

2. Open a second scene. Use the rectangular marquee tool to select that portion of the scene to be added to the first, with a 10 or 15 pixel feather.

3. Use copy and paste to place the second scene on the first, lining up as much as possible using the eye to judge

4. Expand a detail area and line up more accurately.

5. View the whole image, and use the levels tool to adjust the lightness of the second scene (which is a now a new layer over the original) until the levels of the second matches the first.

6. Flatten the image.

7. Repeat for additional scenes

Even with the same exposure for both scenes, I do find that one is often a little lighter or darker, and some lightness adjustments are necessary. I do not understand this, but it is not a problem so I haven't gotten to the bottom of the problem myself.

One problem you will have from time to time is that the angle of one is slightly different from the other, and the seam area becomes apparent. What I do is start over, adjusting the angle of the second scene accordingly. You can do it by sight. You can also determine the exact angle between the two scenes, and make the adjustment in a single step, but that is a little more complicated. You measure the same two points on both scenes to get the x and y coordinates, then using the fact that one radian is about 57 degrees, multiply the difference in the two angles (delta y over delta x) by 57 to get the angle of adjustment in degrees. It works well and saves time.

I know that there are automatic stitching routines, and have used them, but I find my method works well, and gives me more control over the result.

 

[Michael Huang230209]

I just have a UV filter. Should I take that off?

Make sure you don't have a polarising filter on either. You
probably don't, but if you normally use one you need to take it off.

 

[Michael Huang230209]

thanks for the link. i'll try that.

I tried my hands today on panoramics. So I took a few pics and
tried to stitch them together in photoshop. All the pics were shot
in RAW, tripod-mounted with remote control trigger. No post
processing was done.

The final image didn't come out well because (1) the colors don't
match and (2) overlapped subjects did not overlap seamlessly.

The only thing I can think of is that the changing light conditions
rendered the color mismatch. I had set the camera WB to cloudy and
did not change it.

With regards to problem (2), I am clueless.

Any help is greatly appreciated.

Michael

--



http://www.pbase.com/nowhereatoll
http://www.nowhereatoll.com

 

[todds]

Have you tried panoramic software? It will fix lots of problems and save you lots of time.

Check out panoramafactory.com. I've been using it for years and have not reseached the other panorama software out there.

I tried my hands today on panoramics. So I took a few pics and
tried to stitch them together in photoshop. All the pics were shot
in RAW, tripod-mounted with remote control trigger. No post
processing was done.

The final image didn't come out well because (1) the colors don't
match and (2) overlapped subjects did not overlap seamlessly.

The only thing I can think of is that the changing light conditions
rendered the color mismatch. I had set the camera WB to cloudy and
did not change it.

With regards to problem (2), I am clueless.

Any help is greatly appreciated.

Michael

--
Gallery: http://www.tdsphoto.com

 

[Adam Gardner]

someone else could probably give a better answer, but the UV filter only blocks, well UV, so it should not affect the colours.

 

[jpkphoto]

PhotoFit, its not bad... they have a free demo...

http://www.tpfit.com/

Check out panoramafactory.com. I've been using it for years and
have not reseached the other panorama software out there.

I tried my hands today on panoramics. So I took a few pics and
tried to stitch them together in photoshop. All the pics were shot
in RAW, tripod-mounted with remote control trigger. No post
processing was done.

The final image didn't come out well because (1) the colors don't
match and (2) overlapped subjects did not overlap seamlessly.

The only thing I can think of is that the changing light conditions
rendered the color mismatch. I had set the camera WB to cloudy and
did not change it.

With regards to problem (2), I am clueless.

Any help is greatly appreciated.

Michael

--
Gallery: http://www.tdsphoto.com