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Native Moiré on computer screens, page 2.

Another kind of moiré can be create with 2 similar grid screens overlaying each other at an angle.

Fig. 3

Now imagine the black grid in Fig. 3 is the pixel grid you have on your computer display, and the blue grid the image that is to be displayed on the screen.
It is indeed impossible, since you can't really rotate the pixels around, therefore, the computer has to do some maths to decide how to display it. The question here is, will a moiré be produced as it is now?

Fig. 4a (original) Fig. 4b (Photoshop CS) Fig. 4c (Fireworks MX) Fig. 4d (Max/MSP)

Say, we start with Fig. 4a, a single layer flat image with 1-pixel thick diagonal lines on repeat.
Open it in a graphics application. To try to achieve what we want to do as in Fig. 3, we apply a rotational transformation.
How it will end up displayed is decided by the tranformation algorithm within the application you're using.
Nonetheless, a moiré pattern is produced.

What is interesting is, the image we used is a single layer flat image. There isn't another layer to interact with it to produce a moiré, yet a moiré is produced.
The effect came from the interaction between the image and the grid of pixels.

So basically, the computer screen, due to it's nature, is a playground for experimenting with moiré effects.

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© Edmund Fung | edmund@lcdsarenotflickerfree.com