Identify a mesh count with the Moire effect.

[NeroInferno]

Hello!
where I buy my inks they use a photographic film made from a screenprinting veteran to identify the mesh count. Pratically this man has created a film that if overlapped to the mesh it creates a Moire effect. This man doesn't work there anymore and what they have is simply this last film. I don't know if they are stochastic or halftones filme, however I'd like to reproduce it!

Considering the stochastic halftones, for example generated by the "Diffusion Dither" in Photoshop, produce Moire effect if the pixel per inch (PPI) is easily divisible for the mesh count: For example a 40PPI quality file generates a Moire effect on a 81 threads/inch mesh (32 threads/inch for the European).

Stated this I'd like to print a single film with different PPI squares. Is this possible to print in an only time or I need to re-load the sheet into the printer, and print a PPI square per time?

Is possible to make a square, save it in different PPI, and then mount in a single artboard, printing it, or isn't possible to print different PPI images in the same time/artboard?

Thanks!
Fabio

[vrooooom]

Yes, you can put them together. Make a square template and then apply the dither. Copy and paste into a master template for printing.

[NeroInferno]

Yes, you can put them together. Make a square template and then apply the dither. Copy and paste into a master template for printing.

Thanks mate,
I'll post the file once finished for everyone.

Fabio

[NeroInferno]

Here the file, I hope it works! I cannot test on the mesh until tomorrow:

www.bemushroomed.com/ALTRO/GIGPOSTERS/2010-11-13-TROVAFILI.pdf

I've included the following meshes:

THREADS/CM: 32, 48, 55, 77, 100, 120, 140, 154, 165

THREADS/INCH: 81, 122, 140, 196, 254 305, 355, 390, 420

If it works and it's useful to the printers I can make also an upgraded version! And also graphically better

Let me know,
Fabio

PS. It's an editable PDF, A4 size. You can download it and fit to your needs.

[squeegeethree]

I prefer the mesh counter on this page.
Tools | Screen Printing | Victory Factory
I think they all use a moire to indicate. I stopped using them 10 years ago. I just write the mesh count with a sharpie on the printside of the frame now.

[NeroInferno]

I prefer it too but it's in the USA.

I've tried with different brands of felt-tip pens, but during the recovering the ink is removed (especially by the power washer).

Now I write a label and tape on the screen with the transparent and permanent pvc sheet (the stickers one), but I'd wanted to make it for the screens that actually are without label!

Fabio

[NeroInferno]

Hello guys,
I've tried to put the film over the mesh but I cannot see any moire effect

I've tried also to rotate the film over the mesh but nothing.

I've created a gradient from Illustrator, saved and imported in Photoshop. I've save it as a template (1220ppi) and converted many times to Grayscale, and then to Bitmap, with the Dithering diffusion method.

Any input?!

Thanks,
Fabio

[ohdanielsan]

Does dither cause moire? I thought it was too random. I'm probably wrong about that.

[NeroInferno]

Does dither cause moire? I thought it was too random. I'm probably wrong about that.

Stochastic dots are generated from the "Diffusion Dither" method. If you give a PPI number easily dividable with the screen mesh count (threads/inch) you obtain Moirè (for example 150PPI on a 300 threads/inch mesh)

I've used this rule to generate the file..so now I can't understand if:

- 5x5 cm squares aren't enough to see Moirè
- I did something wrong during the creation of the file
- this rule (easily dividablePPI/mesh inch count) is wrong (very probabily not!)

Thanks,
Fabio

[squeegeethree]

Stochastic is designed not to give a moire. I'd just buy the one from victory factory even though they are over here.