Compute negative image processing pixel by pixel

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Giorgio Gurian
Giorgio Gurian 2017-10-28
评论： Giorgio Gurian 2017-10-29
Hi, so I just started using MATLAB, and I need to solve this exercise: "iven a 24bpp Image, write a MATLAB code to compute the "negative image". The solution must reach the result by processing pixel by pixel." I assume I have to use a for loop to process pixel by pixel; til now, I found this possible solution:
>> a = imread('nameOfTheImage.png');
>> d(:,:,3) = 255 - a(:,:,3);
>> d(:,:,2) = 255 - a(:,:,2);
>> d(:,:,1) = 255 - a(:,:,1);
>> imshow([a,d])
but I think it's too simple. Can you help me with some indications? Thank you in advance!

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Rik
Rik 2017-10-28
Congratulation, you came up with a better solution than the one your instructor asked you. You can even make this one shorter:
a = imread('nameOfTheImage.png');
d=255-a;
But you needed to use a loop to access each pixel separately:
d=a;
for row=1:size(a,1)
for col=1:size(a,2)
d(row,col,:)=255-a(row,col,:);
end
end
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Rik
Rik 2017-10-29
You can open up the documentation with the doc command. There you can look at what the for and size functions do.

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