CODEWITHSUNDEEP
algorithm
daisy
daisy

Reputation: 23591

Mirror effect of an image, why need to do bitwise reversal?

When you try to "mirror" an image, left-to-right style, you could just swap the pixels like this:

for i:= 0 to width / 2
  for j:= 0 to height
    swap pixel[i][j] with pixel[width-i][j]

But why do we need to do bitwise on each 8bit pixel(stored as char in C) ?

Upvotes: 0

Views: 160

Answers (1)

rlinden
rlinden

Reputation: 2041

Assuming a pixel is not actually a pixel and represents more than one visible point in the screen, you need to reverse the bits because you want to read them left to right so that the image is completely reversed. Otherwise, you would have each smaller structure being shown "right to left" and the whole figure being shon "left to right", having a result that is not a full reversal.

Upvotes: 1

Related Questions