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Topic: JPEG Compression Comparison (Read 12508 times) previous topic - next topic
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JPEG Compression Comparison

Reply #25 –
how about jp2, irfanview has a jp2 which allows you to encode a maximum resolution of 640X480

I would like to see the percentage?
With my naked eyes, I see no improvements from jp2
jp2 is always worse than jpeg, regardless of the filesize

JPEG Compression Comparison

Reply #26 –
Quote
I'd say that in this JPEG test the color percentage tells more about the quality than pixel percentage, it still would be good to see output images to be of more or less the same size.

Here is another test of ADOBE and IJP, this time with different quality settings. According to results, both changed pixel percentage and changed colour percentage somehow can represent quality of output files, as quality settings and changed percentages move correspondingly. I also managed CJPEG to produce similar file size to ADOBE.

Above results show better proformance of IJP over ADOBE on sample 1 & 2.
However, with another setting, IJP can also produces less changed pixel with smaller size on sample 3. (I cannot make CJPEG produce better result than Photoshop at quality 11 & 12.)


Quote
how about jp2, irfanview has a jp2 which allows you to encode a maximum resolution of 640X480

I would like to see the percentage?
With my naked eyes, I see no improvements from jp2
jp2 is always worse than jpeg, regardless of the filesize


I hope you don't mind that I use ADOBE JPEG2000 1.6 instead. Comparison is between ADOBE'JPEG and ADOBE's JPEG 2000.


edit: add JP2 information