Help me some moire, please

Started 2 months ago | Discussions thread
Albert Valentino Veteran Member • Posts: 7,680
Re: Moire is often created by quick downsizing algorithms

Tom Axford wrote:

When you display an image, it is often downsized to fit the window available. That downsizing needs to be done very quickly to avoid a noticeable time delay in showing the image.

Some browsers (and other software that has to display images) use a very quick and dirty algorithm for downsizing so the image appears quickly, but then use a more sophisticated and better downsizing algorithm to improve the image. So when you first open an image it may show bad moire or other defects for a fraction of a second before the higher quality image appears.

This sort of effect also often appears when you scroll an image or move it around.

Try scrolling or zooming the image below, which often shows bad moire when quick and dirty downsizing algorithms are used on it (display it at full size to see what it really should look like):

A picture is worth a thousand words. Perfect example!!!

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