What is the moiré effect in flexo printing?
The moiré effect occurs when certain images are viewed on a screen or printed.
The term comes from the French word for “maze,” and refers to the appearance of fine, repeating patterns in a picture.
The patterns can be repeated or randomly distributed, and they can look like jagged lines, swirls, or even latticework.
When did the moiré effect appear?
Early in the 1800s, the moiré effect was discovered. Prints with higher resolution than what was available at the time were first noticed when people tried to make them.
The images looked like they had layers of fabric or lace embedded in them.
The moiré effect was first observed in 1827 by an English scientist named Thomas Young, who correctly theorized that it is caused by interference patterns generated by two wavelengths of light passing through the same medium.
Why does the moiré effect happen?
The cause of the moiré effect is usually due to the way that images are captured and displayed on screens. Each pixel of an image is arranged in a grid when it is captured.
However, when the image is displayed on a screen, the pixels are not evenly spaced. As a result of this uneven spacing, pixels overlap one another, creating the moiré effect.
What Causes the Moiré Effect?
As a visual distortion, moiré appears as jagged, monochromatic lines.
It is caused by the interference of lightwaves at different frequencies. The interference creates an image that does not look like a smooth curve or surface.
The most common source of the moiré effect is spinning disks in images.
During the image creation process, the jagged lines are created as a result of interference waves caused by uneven, spindly disk pieces.
There are many types of the moiré effect in flexo printing, but all share some common features.
The first type of the moiré effect is called:
Chevreul’s illusion:
This occurs when a pattern of dots or lines moves across the screen and gradually fades away. The dots or lines create the illusion of a continuous background pattern.
The second type of the moiré effect is known as Sine-Gordon Moiré .
This happens when two closely spaced patterns overlap one another and create an interference pattern. The interference causes the patterns to look like they are moving together, creating the moiré effect.
The third type of the moiré effect is called Poynting-Robertson Moiré .
This happens when two patterns with different colors overlap one another and create a rainbow-like pattern. The colors mix together to form new colors, which creates the moiré effect.
The fourth type of the moiré effect is called Hanns Euler Moiré :
Hanns Euler Moiré is a type of interference pattern that occurs in some optical systems. It is named after the Swiss mathematician and physicist Hanns Euler, who first described it in 1746.
Hanns Euler Moiré patterns are often seen in fiber-optic systems, where they can cause problems with data transmission. In computer graphics, they can occur when two surfaces are too close to each other, causing them to merge together.
How do I get rid of the moiré effect?
If you’re experiencing the moiré effect in your photos, there are a few things you can do to get rid of it.
First, make sure your photo is in focus. This means that everything in the photo is in focus, from the background to the objects in the foreground. If your photo is blurry, it will be harder to fix the moiré effect.
Second, try using a higher resolution photo if possible. This will give you more detail and fewer pixels to deal with.
And finally, use a filter that helps reduce glare.
This article is the part of Problems and solutions in flexo printing series
You can read the title article here – Flexo Printing Problems and Solutions
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