Halftone to mesh moiré demystified
Controlling halftones to avoid moiré is not luck, it’s a n approach derived from scientific facts that is a trusted formula, and it’s easy to learn and master.
AccuRIP® has a built in mesh count calculator. Type in the mesh you will use, and it displays and sets in the proper line screen for your film output. Quality results are all in the math, and easy math at that.
There are different styles of mesh in the screen print industry. Some are monofilament while others are twisted braided just like fishing line. It’s the construction of the mesh that develops its ability to handle halftones and angles differently. Mesh manufacturers do the math for you. They understand what their products can do and deliver that information on their website and literature. It’s best to first find out from the manufacturer or knowledgeable reseller what factor you should use with the simple math formulas that follow.
Some manufacturers use a factor of 3, 4, or 5. The most common factor is 5. Consult with your mesh manufacturer or supplier. If unsure, try 5 first.
When using pre-stretched frames work the formula this way, mesh count divided by factor (3, 4, or 5) to determine maximum line screen a mesh can accept without producing a moiré – 230 divided by 5 =46. This means the maximum line screen halftone to be applied to this mesh should be 46 or lower. Simple.
For users that like to determine best line screen for an image then determine the proper mesh work the formula like this, 46 times 5 = 230. Choose that mesh count or the closest higher mesh, never lower. Also, simple.
A properly stretched mesh to frame will be at a 90 degree angle making 22.5 degrees for all halftones the best angle to avoid mesh moiré as well produce a visually pleasing print.
(c) Freehand Library Article / AccuRIP / Separation Studio NXT / Spot Process / Dmax / Amaze-Ink / DarkStar
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