This simply means selecting a 32×128 pixel area in our original image and removing the rest. CroppingĪ more acceptable way of fitting an image to a display is to crop it. This is because the height had to be reduced almost twice as much as the width to make the original image fit into 32 by 128 pixels. The second difference is that the aspect ratio of the image has changed, making the image look “stretched”. However the gradation, or difference in color between adjacent pixels, plays a large part in making the image look good. Pixilation is unavoidable on an LED display due to the limited number of pixels available. The first is that the image is now pixilated, meaning that the individual pixels that make up the image are now visible. You will notice two differences from the original image. Here we see our example image (which is 250 pixels high by 400 pixels wide) resized for a 32×128 display matrix.Įxample image resized to 32 x 128 pixels. The larger the original image, the more pixels that need to be combined to fit onto the available LED matrix. In essence, you are combining many pixels into one, resulting in a loss of detail. The least desirable way to put an image or video on your display is to simply resize it.
Starting example image at 250 x 400 pixels. They also apply equally to video as well as images. It is in color, but the following instructions also apply to red or amber displays. We will be using this example image that is currently 250 pixels high by 400 pixels wide.
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In comparison, high definition TV is 1080 pixels high and a 5 mega-pixel image is 1920 pixels high.Ĭlearly, this amount of detail cannot be replicated on an LED display. LEDs are typically presented longer rather than taller so that the user has the option to include text messages from left to right on the display.Ī typical LED display may be between 32 and 96 pixels in height. This is because the height is typically smaller than the width, and is therefore more of a deciding factor for display capabilities. For example, a 32×128 pixel display is 32 pixels high and 128 pixels wide, for a total of 4096 pixels.Ĭommonly, only display height in pixels is used for comparison purposes. This forms the pixel matrix, typically written as height by width. Pixels are arranged in rows that go across the length of the display, and columns that go up/down the height of the display. Text messages transmitted directly onto a sign are typically using pixels that are either on or off to make up each character in the message itself. The difference in light output is what creates a three dimensional image on the display itself. Each pixel is controlled as either on or off – and in some LED signs, each pixel can produce different levels of light output. The reason for this limitation has to do with the number of pixels, or points of light, that make up the display.
Despite this, all LEDs have limits when it comes to the amount of detail they can display. They are capable of showing text, images, animations and video visible from far away and under harsh outdoor conditions.
LED signs are amazing pieces of technology.