How to get image whole pixel's RGB color with ImageMagick?

Question

I\'m new to ImageMagick.

I want to know image\'s RGB color of whole pixel.

I already know how to get one pixel\'s RGB color.

But I don\'t know how to

Answer 1

There is a newer option in ImageMagick that is extremely fast. It is similar to txt: but lists the data as comma separated triplets (x,y,color where color is a color name or rgb(rr,gg,bb). Using Mark's red,green,blue image:

time convert WM9qM.gif sparse-color:

0,0,red 1,0,red 2,0,red 3,0,red 4,0,red 5,0,red 6,0,red 7,0,red 8,0,red 9,0,red 10,0,red 11,0,red 12,0,red 13,0,red 14,0,red 15,0,red 16,0,red 17,0,red 18,0,red 19,0,red 20,0,red 21,0,red 22,0,red 23,0,red 24,0,red 25,0,red 26,0,red 27,0,red 28,0,red 29,0,red 30,0,red 31,0,red 32,0,green 33,0,green 34,0,green 35,0,green 36,0,green 37,0,green 38,0,green 39,0,green 40,0,green 41,0,green 42,0,green 43,0,green 44,0,green 45,0,green 46,0,green 47,0,green 48,0,green 49,0,green 50,0,green 51,0,green 52,0,green 53,0,green 54,0,green 55,0,green 56,0,green 57,0,green 58,0,green 59,0,green 60,0,green 61,0,green 62,0,green 63,0,green 64,0,blue 65,0,blue 66,0,blue 67,0,blue 68,0,blue 69,0,blue 70,0,blue 71,0,blue 72,0,blue 73,0,blue 74,0,blue 75,0,blue 76,0,blue 77,0,blue 78,0,blue 79,0,blue 80,0,blue 81,0,blue 82,0,blue 83,0,blue 84,0,blue 85,0,blue 86,0,blue 87,0,blue 88,0,blue 89,0,blue 90,0,blue 91,0,blue 92,0,blue 93,0,blue 94,0,blue 95,0,blue 0,1,red 1,1,red 2,1,red 3,1,red 4,1,red 5,1,red 6,1,red 7,1,red 8,1,red 9,1,red 10,1,red 11,1,red 12,1,red 13,1,red 14,1,red 15,1,red 16,1,red 17,1,red 18,1,red 19,1,red 20,1,red 21,1,red 22,1,red 23,1,red 24,1,red 25,1,red 26,1,red 27,1,red 28,1,red 29,1,red 30,1,red 31,1,red 32,1,green 33,1,green 34,1,green 35,1,green 36,1,green 37,1,green 38,1,green 39,1,green 40,1,green 41,1,green 42,1,green 43,1,green 44,1,green 45,1,green 46,1,green 47,1,green 48,1,green 49,1,green 50,1,green 51,1,green 52,1,green 53,1,green 54,1,green 55,1,green 56,1,green 57,1,green 58,1,green 59,1,green 60,1,green 61,1,green 62,1,green 63,1,green 64,1,blue 65,1,blue 66,1,blue 67,1,blue 68,1,blue 69,1,blue 70,1,blue 71,1,blue 72,1,blue 73,1,blue 74,1,blue 75,1,blue 76,1,blue 77,1,blue 78,1,blue 79,1,blue 80,1,blue 81,1,blue 82,1,blue 83,1,blue 84,1,blue 85,1,blue 86,1,blue 87,1,blue 88,1,blue 89,1,blue 90,1,blue 91,1,blue 92,1,blue 93,1,blue 94,1,blue 95,1,blue 0,2,red 1,2,red 2,2,red 3,2,red 4,2,red 5,2,red 6,2,red 7,2,red 8,2,red 9,2,red 10,2,red 11,2,red ....

real    0m0.035s
user    0m0.024s
sys 0m0.007s

If you want one line per pixel, you can do

convert WM9qM.gif sparse-color: | tr " " "\n"

0,0,red
1,0,red
2,0,red
3,0,red
4,0,red
5,0,red
6,0,red
7,0,red
8,0,red
9,0,red
10,0,red
11,0,red
12,0,red
13,0,red
14,0,red
15,0,red
16,0,red
17,0,red
18,0,red
19,0,red
20,0,red
21,0,red
22,0,red
23,0,red
24,0,red
25,0,red
26,0,red
27,0,red
28,0,red
29,0,red
30,0,red
31,0,red
32,0,green