1080i and 1080p difference

[dobyblue]

Originally Posted by SpaceDog

Close, but not exactly. 1080i upconverted to 1080p is still an interpolation of data that is not consistantly present. Each frame only has 1/2 the data, so the interpolation is based on the frame that preceded it and the frame that will follow. With 1080p, all lines are activated at all time with current frame data.

That is only if you're dealing with an interlaced source and then you're talking about fields, not frames. One frame is still 1920x1080, it's the time-axis that's off between the two. 1080i sources were designed for 1080i CRT's that would actually display the signal the way it's shot, no interpolation.

Nearly 100% of 1080i content these days is shot on film or progressively (HD Digital) and converted to 1080i before broadcast, hence there is no interpolation of data when properly reconstructed.

1080p24 converts to 1080i60 and back to 1080p24 again with no loss, no upconversion and no interpolation.