Descreening & The Moire Effect

My scanner does have a descreen selection built in, but to be honest, after i scanned the images, at first i couldn't tell apart any differences between the descreened image and the original one...


Original Scan

With Descreen Selection


BUT, i tried zoooming into these images, and realised there was a BIG difference!! 

Original Scan (Zoomed)

Descreened Scan (Zoomed)


The Descreened Image was not as clear as the original, but it definately had less of the moire effect!!

Here are samples of a denim fabric swatch:

 

Original Scan

 

Descreened Scan

 Here are the zoomed images:


Original Scan (Zoomed)



Descreened Scan (Zoomed)

So when scanning fabrics, I think it would be a better idea to leave the original settings and dont descreen it because we won't be able to see the details of it.

Lastly here are samples of a magazine cover:  

Original Scan

Descreened Scan


Here are the zoomed versions:

Original Scan (Zoomed)

Descreened Scan (Zoomed)

For the magazine, descreening should be used to reduce the moire effect!!

Through these examples, we can clearly see that descreening can reduce the moire effect and can both improve or disimprove(?) our images!