In general, you might want to avoid such pure tones, as it JPG badly,
and, anyway, it's harsh, even without the compression problems.

That said, there is a solution to your problem : you must ensure that
your conversion program does 1x1x1 subsampling in JPG conversion.
PSP is unable to do that.  If you're not afraid of using a DOS-based
program, I recommend "SEA" which you can get from www.photodex.com
(shareware with GUI, stopped developpement :-(( ).

I join a sample of what it can do for your problem.

(hey, using "SEA" for the "sea" IRTC, isn't it great ??)

Fabien.

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