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Old Dec 29, 2004, 3:25 AM   #21
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Nice post Nick,

A great archival format...I`ve used it quite a few times.
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Old Dec 30, 2004, 3:12 AM   #22
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Wow thanx for info, i just tried saving a copy of a jpeg that was 2291k i saved it as jpeg2000 and its only 919k ? Does this make sense? This is confusing me because it actually compressed the regular jpeg? And an impressive compression at that.

Is anyone else getting these results?

Im not using any plugins, just saved a copy of a jpeg pic as jpeg2000 in PSP9

Windows XP SP2

I havent done a whole lot of experimenting yet but the quality seems fine, the only thing i noticed is i lose the exif data.
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Old Dec 30, 2004, 7:28 AM   #23
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Mag, there is an option for 'lossless' save in the form that is displayed there. If you choose this option, my experience has been that the JPG K2 will inclrease the size of the original JPEG file, Of course you can choose any compression rate there too, but it is not marked as 'lossless'.

FOr my purposes I cose a 25% compression rate, which seemed to be fine, judging onlyby the look on the monitor.
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Old Dec 30, 2004, 1:59 PM   #24
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Ok thank you for response uhurvitz, i tried it again and found the options to save as lossless or compress, and sure enuff the file size increased. Makes sense now thank you!
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Old Dec 30, 2004, 2:51 PM   #25
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It seems to me if you use any compression at all you are defeating the purpose of not losing any data.:roll:
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Old Dec 30, 2004, 4:44 PM   #26
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Well nooner, that is true if your purpose is to keep all image data. But it seems to me that a secondary purpose of this algorithm is to provide a 'better' way in which the image data is compressed than had been provided by other methods. So when I want to compress my images, and I care about image quality, I'd choose this program over others.
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Old Dec 30, 2004, 5:14 PM   #27
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I agree. One thing to be aware of is that the color profile is no longer embedded in the image.
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Old Dec 30, 2004, 5:36 PM   #28
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I did not manage to save the exif info with it, either with irfanview nor PSP9. Is there a way? does Photoshop offer to save exif with jpg2000?
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Old Dec 30, 2004, 7:05 PM   #29
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Photoshop does not. JP2K acts like TIFF in that it does not save EXIF.
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