Yes, to be expected...JPEG compresses the color information (while generally preserving the luminance data) in 8 x 8 pixel squares...so, what you are seeing is what JPEG compression does. What compression are you using? Try a lower (higher quality) compression. BTW, it won't matter if you blur before or after JPEG compression...if you don't blur the TIFF and save as JPEG, you prolly won't see a lot of compression artifacts, but blurring that JPEG will force a reencoding upon saving which will introduce the artifacts. Nature of the beast...
I was using the High setting.
Yes, I've noticed, if I don't blur the TIFF before saving as a JPEG, the 8x8 blocks are not as obvious in the resulting JPEG (though I know they are there.)
Is there a relationship between the resolution of a monitor and the likelihood of a moiré pattern? As resolutions of monitors increase, are users less likely to experience a moiré pattern?
I am thinking of not descreening, not blurring, and taking my chances.