When to deinterlace?

[andris]

When is it appropriate to Deinterlace video?

[antonsvideo]

When is it appropriate to Deinterlace video?

never, it will ruin quality and produce stutter vision

if exporting to web, the appropriate software will let you select progressive as the destination field order, upper and lower fields will be converted to progressive and it will look smooth

[Philip Howells]

When is it appropriate to Deinterlace video?

I have insufficient experience with Edius to make a definitive statement, but am I not correct to suggest that it is appropriate to de-interlace before making still frames from the Edius timeline? I pose this as a question because Anton is so absolute in his recommendation and he obviously has considerable experience with the NLE.

[antonsvideo]

I actually don't deinterlace when exporting a still because Photoshop would do a better job

however, from my experience, I get the best stills by presetting the still image exporter to frame

then in Photoshop, I can apply motion blur, 90 degree x 1 pixel, great result when compared to de-interlace

[Ron Evans]

I am like Anton. Export a frame still in Photoshop format and let Photoshop do deinterlace when I make any corrections to the still. Can then save from Photoshop in whichever format I need. Can also batch correct in Photoshop as needed too.

Ron Evans

[andris]

Re : My question regarding when to interlace - I thought as much and thanks for the confirmation.

But :
I am puzzled why you would export a still from an interlaced source as a frame. My logic tells me to select a specific field to export. Doing this lets you select the field that has the least interlacing artefacts.

[antonsvideo]

Re : My question regarding when to interlace - I thought as much and thanks for the confirmation.

But :
I am puzzled why you would export a still from an interlaced source as a frame. My logic tells me to select a specific field to export. Doing this lets you select the field that has the least interlacing artefacts.

have a look at a field still and a frame still and compare the two in Photoshop

the frame still is way sharper with more detail

[Ron Evans]

Re : My question regarding when to interlace - I thought as much and thanks for the confirmation.

But :
I am puzzled why you would export a still from an interlaced source as a frame. My logic tells me to select a specific field to export. Doing this lets you select the field that has the least interlacing artefacts.

There are no artifacts in a field. Artifacts come from the time difference between the fields since in NTSC the camera takes exposures at approximately 1/60 sec but only using odd or even fields. Thus a field will have half the vertical information and a clever program like Photoshop has thus more information to use interpolating a still frame image when it knows it is interlace video frame. It does what a lot of the new TV's do in effectively creating a higher frame rate progressive display from interpolation. I see no artifacts in the Photoshop correction and as Anton says it is a lot sharper than a field still.

Ron Evans