Some image formats allow decoding in a lower resolution, for example PNG with enabled interlacing adam 7. JPEG files can probably decoded in a lower resolution by simply ignoring the DCT coefficients of the higher frequencies (simple example: use only DC values).
I assume that in the PNG case the lower-resolution result corresponds to a subsampled image, and in the JPEG case it corresponds to a linearly-downscaled image without gamma-correction.
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Mar 22 2020
Mar 22 2020
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