Python Programming for Biology: Bioinformatics and Beyond

Figure 16.2 (Plate 3).  Image pixmaps constructed from array data stored in the

Microarray class. Shown from left to right are: a red and green representation of the

original, imported data; the original data displayed as yellow and blue colours (the original

red-channel data becomes red and green in the image and the original green data becomes

blue); clipped and normalised data where values less than half the maximum are set to

zero.

To make an image only containing red by taking data from layer 0 in the array we can

specify channels as (0,None,None).

rgArray.makeImage(20, channels=(0,None,None)).show()

And  if  we  want  to  change  the  order  of  the  layers  so  that  the  originally  red  and  green

---

data  (indices  0  and  1)  are  mapped  to  yellow  and  blue  respectively  we  do  the  following,

illustrating the result in

Figure 16.2b

:

rgArray.makeImage(20, channels=(0, 0, 1)).show()