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I read in a post that if a jpeg is to be downsampled then it is better to downsampled by 50% or 25%.
It seems this is something to do with not disturbing 8×8 block DCT boundaries in the jpeg. I don’t understand this level of detail myself.
My questions are
(1) How significant is the difference in the final 72 dpi version between downsampling to 55% for example, compared to 50% ?
(2) Does the 50% and 25% refer to a the linear dimension of the image such as the image height? Or does it refer to the total number of pixel points in the image?
It seems this is something to do with not disturbing 8×8 block DCT boundaries in the jpeg. I don’t understand this level of detail myself.
My questions are
(1) How significant is the difference in the final 72 dpi version between downsampling to 55% for example, compared to 50% ?
(2) Does the 50% and 25% refer to a the linear dimension of the image such as the image height? Or does it refer to the total number of pixel points in the image?
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