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Image compression and decompression

Ruchika Verma
Greenhorn

Joined: Sep 19, 2008
Posts: 4
Hi,
I have compressed an image using ImageWriteParam class in ImageIO to reduce its size for image transfer. Now I want to decompress it. I urgently need the code to decompress the image. Please help.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 42289
    
  64
Welcome to JavaRanch.

It's hard to say what might need to be done for decompression, since we don't know what you did for compression. What happens if you try to open the image with ImageIO.read ?


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Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19722
    
  20

In most cases it's not possible to decompress images. The reason is that the compression is lossy - it will remove part of the data which cannot be retrieved. Especially JPEG is quite lossy.

If you want lossless transfer, either change the image type or use a reversable compression algorithm like GZip.


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Ruchika Verma
Greenhorn

Joined: Sep 19, 2008
Posts: 4
Ok. Thanks. But when I try to compress Tiff images with same lossy compression technique I get an exception. Can you share the code to compress Tiff image using lossy compression.
 
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subject: Image compression and decompression