Python Programming for Biology: Bioinformatics and Beyond

The

ImageEnhance

module

To  adjust  PIL  images  the  ImageEnhance  module  is  imported,  as  well  as  the  Image  used

earlier, and then an example image loaded to experiment with:

from PIL import Image, ImageEnhance

img = Image.open('examples/Cells.jpg')

---

Firstly, we will use this image enhancement module to change the contrast in the image.

The way that this works with PIL is to create a processing object (here processObj) for a

given  image,  which  is  then  called  with  the  parameters  needed  to  control  the  image

adjustment.  Here  we  make  a  processing  object  to  adjust  the  contrast  and  then  call  its

.enhance() method with a value of 2.0. For all of the kinds of ImageEnhance enhancement

calls,  a  value  of  1.0  will  preserve  the  image  as  it  was.  Thus  here  we  are  increasing  the

contrast:

processObj = ImageEnhance.Contrast(img)

img2 = processObj.enhance(2.0)

img2.show()