Quote:
Originally Posted by Wombat_In_Space
More data to work with in the image allows you to change the format to a lower quality without losing to much of the quality. It all has to do with the Compression of the data in the image BMP less compression=very little loss of data, JPG high compression= greater loss of data.
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Quote:
Originally Posted by ballaratdragons
 ummm, right. OK. 
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Put in astro terms on planets, the bigger image (BMP) you see in the eyepiece the more detail you see, the smaller the image (JPG) the less you see