test images

[steppy]

Greetings:

Does anyone have images that have printed with moire on offset press that you would be willing to share for our in-house testing?

Best regards,

stephen

 

[gordo]

Does anyone have images that have printed with moire on offset press that you would be willing to share for our in-house testing?

The Altona test suite contains the following moiré test image:

Asuming that you're looking to create subject moiré rather than reproducing moiré that's already in the image, you can create your own by using stock images that contain patterns like pinstripe shirts where the frequency of the pattern is a close multiple of the halftone frequency you're using and where the pattern is angled at less than 30 degrees from the angle of the individual halftone screen angle of the color to are trying to moiré. I.e. if to want to get a moiré with the black channel then the subject pattern needs to be angles between 60 and 40 degrees and the black should be about a 30-40% grey.
A bit of work but very doable.

More info on the topic here: Quality In Print: Moiré

best, gordon p

 

[steppy]

moiré images

moiré images

Gordo:

Thanks so much. BTW your blog and other posts on moiré, screening and angles are helpful and informative.

stephen