RetouchPRO

Go Back   RetouchPRO > Technique > Image Help
Register Blogs FAQ Site Nav Search Today's Posts Mark Forums Read


Image Help Got a problem image? Don't know where to begin? Upload images and ask our users what they think or if they can help

Overlaying misregistered or offset images

Reply
 
Thread Tools
  #1  
Old 08-06-2006, 12:38 AM
oz1 oz1 is offline
Junior Member
 
Join Date: Jun 2006
Posts: 7
Overlaying misregistered or offset images

I'm a total beginner at this so please bear with me. Also, this is my first post so "hello, all"

I have two images taken at different exposures to acquire details in a scene with very bright & dark areas.

I would like to combine them to produce a single image. I think I understand the process of using layer masks etc in PS. However, both images were acquired hand-held so they don't exactly overlay. I'll therefore need to crop both to end up with a common area with the same no of lines & pixels (x & y).

Is there any way of doing the overlaying & cropping automatically to produce two images of the same size that overlay either PS CS2 or another piece of software?

If these were satellite images, I would find a set of common ground control points to identify the image offset & then resample and or subset the two images but this is a pretty labour intensive procedure. I have done this in the past automatically using cross correlation techniques to find the image offsets but had to write the program myself.

I be very grateful for any help readers can offer.
Reply With Quote top
  #2  
Old 08-06-2006, 01:05 AM
Daviskw's Avatar
Daviskw Daviskw is offline
Senior Member
 
Join Date: Apr 2006
Posts: 728
Hi Oz

I'm sure someone here will have a much better option for you. But you can try this;

Have your two pictures on layers in the file. Change the top pictures blend mode to Difference.

Now select the move tool and get the alignment close then use the arrow keys to fine tune. When your top layer turns completely black I will be aligned with the picture below. Now just change the blendmode back to normal. There are several different procedures to blend the pictures together. If you need help there I'm sure someone can help.

Butch
Reply With Quote top
  #3  
Old 08-06-2006, 08:11 AM
mistermonday's Avatar
mistermonday mistermonday is offline
Moderator
Patron
 
Join Date: Dec 2005
Posts: 3,028
Image Alignment

Oz1, welcome to Retouch Pro!
Butch's method is probably the best when the images are copies of each other or have been taken at the same exposure settings. If no two areas of the same image are identical, alignment may be difficult. What I would try would be to reduce the opacity of the top layer to about 50-60% and get as close alignment as you can visually. Then change the top layer opacity back to 100% and nudge the layer using the Up / Down / Left /Right arrow keys. The position of most accurate alignment should appear obvious to you.
Regards, Murray
Reply With Quote top
  #4  
Old 08-06-2006, 08:14 AM
NancyJ's Avatar
NancyJ NancyJ is offline
Senior Member
 
Join Date: Jun 2004
Posts: 729
Even in different exposures you should be able to align them using a difference blend - it wont go black but you should be able to line it up correctly based on outlines
Reply With Quote top
  #5  
Old 08-06-2006, 05:04 PM
oz1 oz1 is offline
Junior Member
 
Join Date: Jun 2006
Posts: 7
Success!

Thanks to all for replying.

I tried out the suggested method. The edges do show up nicely & I was able to overlay the images nicely. Now all I have to do is take good pictures!
Reply With Quote top
  #6  
Old 08-12-2006, 12:22 AM
oz1 oz1 is offline
Junior Member
 
Join Date: Jun 2006
Posts: 7
Photoshop does it automatically?

There does seem to be a way of merging misaligned images automatically. Photoshop CS2 has a tick box "attempt to automatically align source images" in the "Merge to HDR" function.

See http://www.luminous-landscape.com/tutorials/hdr.shtml

I don't know how well it works but perhaps someone who has PS CS2 could advise.
Reply With Quote top
Reply

  RetouchPRO > Technique > Image Help


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Resizing images for RetouchPRO jeaniesa Photo Retouching 19 11-05-2016 09:28 PM
Need help extracting/masking images, WILL PAY Ating Classifieds 7 12-17-2006 08:22 PM
--> Site Policy on Celebrity Images <--- DannyRaphael Photo-Based Art 3 05-11-2006 03:20 PM
Reconsidering 16 bit Ed_L Input/Output/Workflow 14 11-01-2005 10:41 AM
$ for RetouchPro - images roger_ele Website Feedback 0 12-04-2002 11:24 PM


All times are GMT -6. The time now is 11:28 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Copyright © 2016 Doug Nelson. All Rights Reserved