改变示波器TDS3054D图片颜色

作者:卓晴博士，清华大学自动化系

更新时间：2020-08-06 Thursday

■ 问题由来

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在 截取示波器网络图片 中给出了PYTHON程序来自动截取 Tektronix示波器的网络图片的方法。但是前两个通道的曲线中，第二个通道显示为青色，颜色不是很明显。如果能够通过颜色改变，增加该图片的对比度。

下图是前两个通道显示的图片。

01颜色调整方案

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对组成图片的RGB进行如下的调整：

编程如下对比比较鲜艳的图片：

02图片处理程序

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#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY                     -- by Dr. ZhuoQing 2020-08-06
#
# Note:
#============================================================

from headm import *
import matplotlib.image as mpimg

imageid = 5
imagefile = tspgetdopfile(imageid)
printf(imagefile)

imagergb = mpimg.imread(imagefile)

#printf(shape(imagergb))
#printf(type(imagergb))
#printf(imagergb.dtype)

#imagelist = imagergb.tolist()
#printf(shape(imagelist), type(imagelist))

imagelist = []
imagelist.append((imagergb[:,:,1]).tolist())
imagelist.append((imagergb[:,:,0]).tolist())
imagelist.append((imagergb[:,:,2]).tolist())

printf(shape(imagelist))

#------------------------------------------------------------
imageshape = shape(imagergb)
imagewidth = imageshape[1]
imageheight = imageshape[0]

#for h in range(imageheight):
#    for w in range(imagewidth):
#        r,g,b = imagergb[h,w,:]

#        if r == 0xff and g == 0xff and b == 0xff:
#            imagelist[h][w][:] = r,g,b
#            continue

#        if b == 0xff and g == 0xff and r < 0xff:
#            g = r
#            b = r
#            r = 0xff
#        elif g == 0xff and b < 0xff and r < 0xff:
#            g = 0x80
#            r = r // 2
#            b = b // 2
#        elif b == 0xff and r == 0xff and g < 0xff:
#            b = 0x80
#            r = 0x80
#            g = g//2

#        imagelist[h][w][:] = r, g, b

imagergb = array(imagelist)
imagergb = swapaxes(imagergb, 0, 2)
imagergb = swapaxes(imagergb, 0, 1)

plt.imshow(imagergb)
plt.show()

#------------------------------------------------------------
#        END OF FILE : TEST1.PY
#============================================================