a very quick question

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Ahmed Abdulla 2019-6-14

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评论： dpb 2019-6-14

i wanted to ask if matlab is reading RGB values of pixels from rows and columns. i wanted to ask does it for rows does it go from top to bottom of an image or from bottom to top and for the columns does it go from left to right or from right to left

for i = 1:rows
    for j = 1:columns
        red = myImage(i,j,1);
        green = myImage(i,j,2);
        blue = myImage(i,j,3);
        rgb = red*256*256 + green*256 + blue;
        compressed(i,j) = rgb;
    end
end

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dpb 2019-6-14

Array data are column major as any other array.

If you use the high-level version of image to display an array, then the displayed axes has Y in the 'reverse' mode and view [0 90] but the low-level version (if use CData) doesn't make those changes.

So, what you see depends on how displayed but "memory is memory"

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