Duplicated book without moire and created CTP plate curves

[sornchai]

Hi. I'm from Bangkok Thailand. I got the screen pictures black & white book. I scanned by flated bed . Customer requested new job without moire and no dot gains.every sense looks seem original. How I can solved moire and created CTP plate curves? Thank you for idea

 

[Alois Senefelder]

Hello sornchai,

DO YOU Mean that a customer supplied you with "Printed Halftone Images" that you attempted to scan ????

Regards, Alois

 

[gordo]

Hi. I'm from Bangkok Thailand. I got the screen pictures black & white book. I scanned by flated bed . Customer requested new job without moire and no dot gains.every sense looks seem original. How I can solved moire and created CTP plate curves? Thank you for idea

There are tutorials on YouTube on how to remove the halftone dots in a scanned image. Of course you should only be scanning such images if you have the legal right to do so since the original is probably copyrighted.
Dot gain is normal. If you remove it using curves the result will likely appear low in contrast and washed out. Perhaps your customer doesn’t understand what they are asking for - or why. You should find out what their reason is.
This post explains how dot gain curves are created: The principle of dot gain compensation plate curves

 

[PricelineNegotiator]

Question - can you intentionally print a book to have moire?

 

[chriscozi]

Yes.
I have printed intentional moire on a 2-color letterhead that the salesman originally sold as a 'special effect' back when we laid screens behind film masks. I found this out AFTER I corrected the film to be plated, only to be told to 'put it back the way it was.'
Sample had moire. Final product had moire.
Sigh.

 

[gordo]

Question - can you intentionally print a book to have moire?

Yes. However, keep in mind that there are different kinds of moire with different causes: Moiré

 

[PricelineNegotiator]

Yes. However, keep in mind that there are different kinds of moire with different causes: Moiré

Yeah, I've read some stuff from this guy before. I'll take a look. Thanks.

 

[fiatlux]

Yeah, I've read some stuff from this guy before. I'll take a look. Thanks.

Gordo is that guy. LOL

 

[PricelineNegotiator]

Gordo is that guy. LOL

Duh.

 

[Zerge]

Moiré
If two screens with slightly different screen frequencies are superposed, disturbances occur in the pattern.
These superposing effects are called moiré. This also occurs when the two screens are rotated by slightly different angles.

Here is a good (IMHO — «must understand») giude for AM, FM and Hybrid screening.

 

[sornchai]

Hello sornchai,

DO YOU Mean that a customer supplied you with "Printed Halftone Images" that you attempted to scan ????

Regards, Alois

Yes.I scan for making files and run production by offset printing

 

[sornchai]

Here is a good (IMHO — «must understand») giude for AM, FM and Hybrid screening.

Thank you

 

[sornchai]

There are tutorials on YouTube on how to remove the halftone dots in a scanned image. Of course you should only be scanning such images if you have the legal right to do so since the original is probably copyrighted.
Dot gain is normal. If you remove it using curves the result will likely appear low in contrast and washed out. Perhaps your customer doesn’t understand what they are asking for - or why. You should find out what their reason is.
This post explains how dot gain curves are created: The principle of dot gain compensation plate curves

Got it. I read your blog for long time. When will you start new Blog?

 

[gordo]

Got it. I read your blog for long time. When will you start new Blog?

I probably won't. It was a lot of work to create the content and so, once I achieved my goal in creating it there wasn’t any reason to continue.