RGB to LAB¶

Convert image from RGB colorspace to LAB colorspace and split the channels.

rgb2gray_hsv(img, channel, device, debug=None)

returns device, split image (l, a, or b channel)

• Parameters:
  • img- Image to be converted
  • channel - Split 'l' (lightness), 'a' (green-magenta), or 'b' (blue-yellow) channel
  • device - Counter for image processing steps
  • debug - None, "print", or "plot". Print = save to file, Plot = print to screen. Default = None
• Context:
  • Used to help differentiate plant and background
• Example use:
  • Use In VIS Tutorial

Original RGB image

from plantcv import plantcv as pcv

# image converted from RGB to LAB, channels are then split. Lightness ('l') channel is outputed.

device, l_channel=pcv.rgb2gray_lab(img, 'l', device, debug="print")

Lightness channel image

from plantcv import plantcv as pcv

# image converted from RGB to LAB, channels are then split. Green-Magenta ('a') channel is outputed.

device, a_channel= pcv.rgb2gray_lab(img, 'a', device, debug="print")

Green-Magenta channel image

from plantcv import plantcv as pcv

# image converted from RGB to Lab, channels are then split. Blue-Yellow ('b') channel is outputed.

device, b_channel=pcv.rgb2gray_lab(img, 'b', device, debug="print")

Blue-Yellow channel image