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HELP! finding image compression type

mike dib
Greenhorn

Joined: Feb 09, 2011
Posts: 3
Hello Everyone!
I am in the process of writing an application that processes tiff files.

I have a requirement that I have to check to confirm that the image has group 4 compression type.

I have successfully implemented this using imagemagick/jmagick..... but due to certain circumstances, we are not able to use jmagick.

I am now using JAI to split multi page tiff files and iText.jar to find the DPI of these images... however I still need to find the compression type!

Does anyone know how to find an image compression type using a method other than image magick/ jmagick?? If so... please provide me with any download links and a few lines of example code!!!

A big virtual hug to whoever might have a solution for me!!!

Thanks so much!

p.s. it is in a linux environment.
mike dib
Greenhorn

Joined: Feb 09, 2011
Posts: 3
P.S. I've alredy tried the functions:

Method Summary
int getCompression()
Returns the value of the compression parameter.
int getDeflateLevel()
Gets the compression level for DEFLATE compression.

located at: http://download.oracle.com/docs/cd/E17802_01/products/products/java-media/jai/forDevelopers/jai-apidocs/com/sun/media/jai/codec/TIFFEncodeParam.html

They return 1 for getCompression and -1 for getDeflateLevel regardless of what compression type the image i run through them are.

mike dib
Greenhorn

Joined: Feb 09, 2011
Posts: 3
I Resolved this issue- for those of you who attempt to do the same here is how:

reference jar files jai-core-1.1.3-alpha.jar

start code

File file = new File(filepath);
RenderedOp page = JAI.create("fileload",file.getCanonicalPath());
TIFFDirectory dir = (TIFFDirectorypage.getProperty("tiff_directory");
TIFFField compress = dir.getField(259);
System.out.println("The compression is: " compress.getAsInt(0));

end code

The value 4 is equal to group 4 compression.

Cheers
 
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