Color rotation (hue)

Jean-Patrick Pommier jeanpatrick.pommier at gmail.com
Thu Mar 20 10:48:22 EDT 2014



<https://lh3.googleusercontent.com/-XZbiua42-VA/Uyr_pGIEHqI/AAAAAAAABtU/rTheRwAB0p4/s1600/04_mfish_stretch.png>
The different spectral components can be combined into one rgb image<http://nbviewer.ipython.org/gist/jeanpat/9665267>to yield:


Le jeudi 20 mars 2014 09:00:48 UTC+1, Jean-Patrick Pommier a écrit :
>
>
> <https://lh5.googleusercontent.com/-tYhHDFsj2cM/UyqfVvwM_nI/AAAAAAAABtE/wGITFPkdxaE/s1600/mfish.png>
> Now it's clear for me, thank you for your code!
>
> jp
>
> Le mercredi 19 mars 2014 10:16:45 UTC+1, Jean-Patrick Pommier a écrit :
>>
>> Hi,
>> I 'd like to modify continuously a pure red image to get an orange, 
>> yellow, green, light blue, blue, purple image.
>> The idea is to convert a rgb image, to convert it into hsv color space, 
>> to modify the hue value then to back convert into rgb color space.
>> The problem is that only green and blue can be obtained but no 
>> intermediate color:
>>
>>
>> <https://lh4.googleusercontent.com/-s_Acsx0EmRY/UylefCuSGnI/AAAAAAAABsQ/T7pAI2f-D6w/s1600/color_rotation.png>
>>
>> According to adobe<http://dba.med.sc.edu/price/irf/Adobe_tg/models/hsb.html>, 
>> adding a hue equal to 36 should yield a yellow image.
>>
>> *Here's the code:*
>>
>> from skimage import io
>> from skimage import color
>> from scipy import ndimage as nd
>> import numpy as np
>> from matplotlib import pyplot as plt
>> import os
>>
>> cy55 = io.imread('/home/jeanpat/MFISH/PSI/P07/01/Cy5/P070109C.tif')
>>
>> zero = np.zeros(cy55.shape,dtype=np.uint8)
>> rgb0 = np.dstack([cy55, zero,zero])
>>
>> hue_rotations = [18, 36,72,90,108]
>> images = {}
>> images[0] = rgb0
>> hsv0 = color.rgb2hsv(rgb0)
>> for hue in hue_rotations:
>>     hsv = np.copy(hsv0)
>>     hsv[:,:,0] = hsv[:,:,0]+ hue
>>     rgb = color.hsv2rgb(hsv)
>>     images[hue] = rgb
>>
>> Any greyscaled image should be ok but the image used here is:
>>
>>
>> <https://lh5.googleusercontent.com/-whwEGZWWhIE/UylgLDhf0VI/AAAAAAAABsc/02kl9UCvkAo/s1600/P070109C.tif>
>>
>>
>>
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