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Pixel display formats like *.bmp, *.gif, *.tif store an array of entries, with each entry representing one pixel. This is usually done by storing a 32-bit word in RRGGBBAA format, where

 0<=RR<=255
 0<=GG<=255
 0<=BB<=255
 0<=AA<=255

RR represents the red intensity, BB represents the blue intensity, GG represents the green intensity, and AA represents the alpha (transparency).