You need to take what are called flats in astrophotography appropriate to the fl you are using. These are short exposures that show the distribution of light across your imaging field and are used to give a fully illuminated field. Sometime despite this you can still see a gradient and you have to apply a dynamic background subtraction but that uses an expensive program and only works with 32 bit images ie Fits files.I would recommend the use of deep sky stacker to process your images, including taking lights, darks, bias and flats to give a better representation of what you are trying to image.Hope this helps. It's a good start but it just ain't easy.I've attached an image of a very faint galaxy where I used data taken at a dark site over two years to give in excess of 10 hr total integration time.For interest the galaxy is NGC 300.
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2 Introduction to medical imaging cassettes that are inserted into a laser reader following X-ray exposure. An analogue-digital converter (ADC) produces a digital image. DR uses a detector screen containing silicon detectors that produce an electrical signal when exposed to X-rays. This signal is analysed to produce a digital image. Space imaging may refers to:. Astronomical image processing of objects usually beyond the Solar System; Images taken by Earth satellites; Images processed that are produced from the exploration of Mars; Images produced by any unmanned space mission; Images taken by any manned space mission; Other images from the history of space exploration.See the timeline of planetary exploration.
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