Matching perspective across multiple photos

Discussion in 'Digital Darkroom' started by pbalko, Oct 16, 2014.

  1. I've shot a series of church windows and, while being as diligent as is possible for me, the perspective varies from shot to shot. Using PS CC 2014, I've tried opening two images as layers and, using the transform tool, match the perspective of one to the other while playing with layer transparency. I'm still having a difficult time seeing what I'm doing. Can you suggest a particular blend mode or other specific techniques that might help me accomplish my goal. Thanks in advance.
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  2. Matching perspective? Are you trying to assemble a bracketed exposure HDR? If so, stack them using Photomatix, which will align images taken without a tripod and crop the rough edges at the end. Then make a perspective correction on the end result.
     
  3. Thank you Edward, but I'm not trying to create HDR. I have photos of twelve different church windows in identical settings. Due to the physical condition of the site and my own less than stellar technique, the perspective of each photo is noticeably different from the others to the point that Auto-Align Layers in Photoshop is unable to adequately align the images.
    I choose one photo as a template and open each of the other photos in turn as a layer on top of it. first using Auto-Align to get me in the ballpark and then using Free Transform finesse the final result. At that point I would delete the bottom layer, save the corrected layer and move on to the next image. Rinse. Repeat. My problem is I am unable to see the bottom layer clearly enough to accomplish the task, or the top layer if I lower the opacity enough to see the bottom layer. Can someone suggest a particular blending mode or other technique that will help me attain my goal?
    Cropped to better illustrate the problem - window frames and bricks in the outer arch. Maybe I should just accept this as 'good enough.' On 2 greeting card or 8x10s side by side maybe it just won't be all that noticeable. Am I being anal?
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  4. If you're choosing one layer as a template and discarding it after each photo, can't you just change the color of it? Make it monochromatic or duo-tone.
     
  5. Draw guide lines in a separate layer, put that layer on top and lock it.
    Alternative: Straighten the center of the image, then correct the vertical perspective to parallel (you can draw guidelines from the rulers). It's easier to make things straight, than convergent to the same degree. Simple correction will compress the vertical dimension. To keep proportions uniform, stretch the top and squeeze the bottom equally.
     

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