![]() As this is greyscale there is just a single value for each pixel representing the intensity of the data recorded.Ĭapturing the entire spectrum is not particularly useful and the image needs to be restricted to certain wavelengths of light. If an unfiltered image is taken it will include all the spectrum from ultraviolet to near infrared with each pixel having an intensity value of 0 to 32,768 representing the sum of all the light entering the camera. The WFC3 camera is a 16 mega-pixel monochrome camera which produces a greyscale image. This ranges from ultraviolet through visible light to near-infrared. The camera of WFC3 is capable of recording a much larger spectrum than the human eye can see. Hubble has a number of instruments on the telescope, but the one we shall examine in this article is what is known as the Wide Field Camera 3 or WFC3. Knowing how an image is constructed allows us to start to understand how a Hubble image is put together. Screen image of the FITS Liberator GUI specially developed by the ESA and NASA for processing Hubble’s images. So a pixel having an RGB value of 0:0:0 is black and that having 32,768:32,768:32,768 will be white. In this case 0 represents no colour and 32,768 is full color. Each pixel of the image has 3 components Red, Green and Blue with a scale of 0 to 32,768 representing the intensity of the color for that pixel. From these prime colours any other color can be represented by mixing them in varying proportions. These are grouped together so tightly that the eye cannot see the individual pixel, but sees a smooth transition from one pixel to the next.īasically a color image is created from three separate components: Red Green and Blue. Each pixel represents a colour and intensity in the image. A typical image is created from a grid of pixels or dots. To understand the elements that create the images we need to understand what we see as an image. How are these created and what elements determine the color mapping? The Hubble Telescope captures images in monochrome, just like the old black and white photographs with no color, but the images we see are stunning vibrant color pictures. Credit: STScI, OPO, Zolt LevayĮveryone has seen the dramatic images produced by the Hubble Telescope from the iconic Pillars of Creation to the hundreds of galaxies in one shot, but how are these images created? HST WFC3/UVIS images of the galaxy group Stephan’s Quintet in three broad-band visible-light filters left: F439W (B), center: F555W (V) and right: F814W (I).
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