[OpendTect_Users] Importing digitized seismic images (solved!).

[Alex Antunes]

Dear OpendTect community,

Last week I posted a question about importing digitized images into 
OpendTect. I received several suggestions and contributions, and I wish 
here to thank you all for sending the replies.

After some more internet search, I came across the free software kogeo 
(http://www.kogeo.de/), which is also a platform for analysis and 
interpretation of seismic data. To my surprise, among many other 
features, kogeo can import bitmaps and convert them into seismic data 
and then export them as a SEG -Y file. I decided to test it and it 
really worked!

So I decided to post the steps I took and the results I got. Of course, 
first it'll be necessary some bitmap edition in a proper image editor 
software. The original bitmap came from a presentation and can be seen 
in the figure section1_original_bitmap.jpg.

Launch kogeo and go to Data > Import bitmap data (kogeo_screen1.jpg);

Select the desired file in the window that opens. You'll need to 
properly set the importing parameters so that the SEG-Y conversion 
occurs correctly: check the "resample image before transformation" 
option and then the number of traces and samples, the resampling mode 
(for me "InterpolationModeHighQualityBilinear" worked just fine) the 
sample rate for the seismic data to be generated, chose between little 
ou big endian modes, and click ok (kogeo_screen2.jpg);

Wait for the data processing and voila, behold the seismic data just 
converted from the bitmap (kogeo_screen3.jpg)!

The data is generated without coordinates that can be loaded from an 
additional file in kogeo own, but I preferred to perform this step 
directly into OpendTect while loading the SEG-Y data. I repeated the 
procedure for all bitmaps and then converted and loaded into OpendTect 
(the result can be seen in the attached figure OpendTect_scene.jpg).

Fantastic! Hope it works for you too.

Have fun and best regards,

Alex Antunes.
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