Search found 12 matches

by syamashi
2013-01-24T16:27:57-07:00
Forum: Users
Topic: Quality loss with JPEG2000?
Replies: 4
Views: 6343

Re: Quality loss with JPEG2000?

Interestingly, jp2:rate values did not affect but jp2:prg value did. I hope someone can explain what's going on.. convert input.tif -define numrlvls=7 -define jp2:tilewidth=1024 -define jp2:tileheight=1024 -define jp2:rate=0.01 -define jp2:mode=int -define jp2:prcwidth=1024 -define jp2:prcheight=102...
by syamashi
2013-01-23T18:58:36-07:00
Forum: Users
Topic: Quality loss with JPEG2000?
Replies: 4
Views: 6343

Re: Quality loss with JPEG2000?

Is there a way to downsize an image by adjusting "jp2:ilyrrates"? How do I come up with these rates?
by syamashi
2013-01-22T11:53:40-07:00
Forum: Users
Topic: Quality loss with JPEG2000?
Replies: 4
Views: 6343

Re: Quality loss with JPEG2000?

jp2:rate didn't seem to work but the example of the lossless encoding option on the ImageMagick example did work. $ convert input.tif -define numrlvls=6 -define jp2:tilewidth=1024 -define jp2:tileheight=1024 \ -define jp2:rate=1.0 -define jp2:lazy -define jp2:prg=rlcp -define jp2:ilyrrates=\ '0.0156...
by syamashi
2013-01-18T17:18:01-07:00
Forum: Users
Topic: Quality loss with JPEG2000?
Replies: 4
Views: 6343

Quality loss with JPEG2000?

Hello, I'm trying to look into the capabilities of JPEG2000 file format and experiencing file conversion challenges from TIF format. It seems that sometimes the converted images contain dark rectangles spotted in various parts in an image. Most of the time this happens in the very bright parts in an...
by syamashi
2012-12-14T13:57:35-07:00
Forum: Users
Topic: File conversion discrepancy between CentOS 6.0 and 6.2
Replies: 8
Views: 8290

Re: File conversion discrepancy between CentOS 6.0 and 6.2

Ok, great. I got the same versions of the jasper and now I get the following error:

*** glibc detected *** /usr/local/ImageMagick-6.7.8-2_64bit/bin/convert: double free or corruption (fasttop): 0x00000000014bc2f0 ***

Anything missing?
by syamashi
2012-12-14T08:48:42-07:00
Forum: Users
Topic: File conversion discrepancy between CentOS 6.0 and 6.2
Replies: 8
Views: 8290

Re: File conversion discrepancy between CentOS 6.0 and 6.2

Hi,

I think the versions of IMs are the same ImageMagick-6.7.8-2_64bit. How do I check the Jasper Delegate libraries?

Thanks,
by syamashi
2012-12-13T18:40:30-07:00
Forum: Users
Topic: File conversion discrepancy between CentOS 6.0 and 6.2
Replies: 8
Views: 8290

File conversion discrepancy between CentOS 6.0 and 6.2

Hello, I'm using ImageMagick-6.7.8-2_64bit to convert files into JPEG2000 format and I'm experiencing discrepancies in generated files between different versions of CentOS. For instance, I attempted to convert a JPEG file which is 2.5M in size, after the conversions on both OSes, CentOS 6.0 gives me...
by syamashi
2012-11-15T14:36:03-07:00
Forum: Users
Topic: Converting Pyramidal TIFF to JPEG2000
Replies: 9
Views: 9923

Re: Converting Pyramidal TIFF to JPEG2000

Check the docs on Jasper and see if it does support it and report back.
Sorry, I couldn't find this.
by syamashi
2012-11-09T13:09:18-07:00
Forum: Users
Topic: Converting Pyramidal TIFF to JPEG2000
Replies: 9
Views: 9923

Re: Converting Pyramidal TIFF to JPEG2000

Interestingly, I was not able to list the dimensions with one consolidated JPEG2000 file as opposed to what listed with Pyramidal TIFF file. However, I managed to print the dimensions of individually generated files and they appeared to be the same dimensions.

thanks for your help,
by syamashi
2012-11-09T09:52:56-07:00
Forum: Users
Topic: Converting Pyramidal TIFF to JPEG2000
Replies: 9
Views: 9923

Re: Converting Pyramidal TIFF to JPEG2000

Hi, I tried with "+repage" option but that didn't help. The lowest resolution level comes out in "229x172". Here is the command I'm running: convert input.tif -define jp2:numrlvls=7 -define jp2:tilewidth=1024 -define jp2:tileheight=1024 -define jp2:rate=0.02348 -define jp2:prg=rpcl -define jp2:mode=...
by syamashi
2012-11-06T15:00:46-07:00
Forum: Users
Topic: Converting Pyramidal TIFF to JPEG2000
Replies: 9
Views: 9923

Re: Converting Pyramidal TIFF to JPEG2000

Hi anthony, Thanks for you reply. That should work on what I intend to do. I also have two more question regarding this conversion and I hope you don't mind answering. I'm attempting to convert a TIFF file which is 14000x11000 in size and the lowest resolution level of the JPEG2000 from previous con...
by syamashi
2012-10-05T11:16:54-07:00
Forum: Users
Topic: Converting Pyramidal TIFF to JPEG2000
Replies: 9
Views: 9923

Converting Pyramidal TIFF to JPEG2000

Hello, I'd like to convert Pyramidal TIFF to JPEG2000. However, the generated files are separated in to seven different files which I believe they are associated with the resolution levels. The following command worked for flat TIFFs to generate a single file: % convert source_image -define numrlvls...