[djatoka-devel] image distortion when rotating images using OpenURL service

[Shaun E. <sh...@pr...>]

Hi folks,
Perhaps someone can help me with this.  I'm getting some strange results 
when trying to rotate an image using the Djatoka OpenURL service.  Using 
the links below, one will notice that the document text is distorted and 
illegible when rotated 90 degrees. (180 degree rotation is fine, but 270 
is also screwed up.)

Normal:
http://findingaidsdev.princeton.edu/images/adore-djatoka/resolver?url_ver=Z39.88-2004&rft_id=urn:pudl:images:deliverable:AC044/c0003/00000001.jp2&svc_id=info:lanl-repo/svc/getRegion&svc_val_fmt=info:ofi/fmt:kev:mtx:jpeg2000&svc.format=image/jpeg&svc.level=5&svc.rotate=0&mimetype=image.jpg

Rotated 90 degrees:
http://findingaidsdev.princeton.edu/images/adore-djatoka/resolver?url_ver=Z39.88-2004&rft_id=urn:pudl:images:deliverable:AC044/c0003/00000001.jp2&svc_id=info:lanl-repo/svc/getRegion&svc_val_fmt=info:ofi/fmt:kev:mtx:jpeg2000&svc.format=image/jpeg&svc.level=5&svc.rotate=90&mimetype=image.jpg

I don't know if this matters, but this image was extracted from a PDF as 
a bitmap, converted to a TIFF and then compressed to JPEG2000 using the 
same compression "recipe" as we are for images produced in our photo 
studio (which rotate just fine). When rotating the JPEG2000 images in 
ImageMagick, the text is perfectly legible.

Any thoughts?

-- 
Shaun D. Ellis
Digital Library Interface Developer
Firestone Library, Princeton University
voice: 609.258.1698 | sh...@pr...