Image 之前）您是否使用旧版本的IM？尝试识别-版本。我有6.9.1-6 Q16 x86_64 2015-06-26 for i in range(500): for j in range(500): if abs(x[i,j][0] - 234) &

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之前）您是否使用旧版本的IM？尝试

识别-版本

。我有

6.9.1-6 Q16 x86_64 2015-06-26

for i in range(500):
  for j in range(500):
    if abs(x[i,j][0] - 234) < TRESH and abs(x[i,j][1] - 211) < TRESH and abs(x[i,j][2] - 23) < TRESH:
        x[i,j] = ... # how to set the new color in a smooth way?

# Make red-yellow gradient with blue square within
convert -size 500x500 gradient:red-yellow -fill none -stroke blue -strokewidth 10 -draw "rectangle 100,100 400,400" image.png

convert image.png \( +clone -fill "rgb(255,128,0)" -colorize 100% \) \
   -compose difference -composite                                    \
   -evaluate Pow 2 -separate                                         \
   -evaluate-sequence Add -evaluate pow 0.5                          \
   -negate                                                           \
   colour_distance.png

convert image.png                                   \
   \( +clone -fill fuchsia -colorize 100% \)        \
   \( colour_distance.png -sigmoidal-contrast 20 \) \
   -composite z.png

#!/bin/bash
# Make red-yellow gradient with blue square within
convert -size 500x500 gradient:red-yellow -fill none -stroke blue -strokewidth 10 -draw "rectangle 100,100 400,400" image.png

# Make everything blue green, then everything else transparent, then blur the lot
convert image.png -fill green -opaque blue -fill white +opaque green -transparent white -blur x6 x.png

# Now overlay the blurred greeness onto the original after replacing blues with green
convert x.png \( image.png -fill green -opaque blue \) -compose overlay -composite result.png