What is the Field

[Walter Biscardi]

[sulaman hameed] “Anyone plz tell me about … “What is the Field”… Lower (Even), Upper (Odd), None…. what is usage…
any suggestion thankfull all of U….”

Interlaced video is made up of two fields per frame. The first (Upper) and the second (Lower). When editing interlaced video it is important to know the correct field order for the format you are working with. For example NTSC Standard Definition Video is Lower Field First. PAL Standard Definition is Upper Field First. Most High Definition is Upper Field First.

If you were to create a graphic or edit your video in the incorrect field order, your video will appear “jittery”.

Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Food Network’s “Good Eats”
HD Editorial for “Assignment Earth”

“I reject your reality and substitute my own!” – Adam Savage, Mythbusters

[Mike Smith]

Except, of course, PAL standard def DV and family is lower field first – apart from a quirky PAL DV codec from Matrox for some of its hardware, which is upper field first ..hmm

[Rafael Amador]

Hi Sulaman,
Open the HELP in FC and you have a very graphic explanation of what is interlacing. In the page iV-358.
Cheers,
Rafael

[Walter Biscardi]

[rafalaos] “Open the HELP in FC and you have a very graphic explanation of what is interlacing. In the page iV-358.
Cheers,”

Very good suggestion

Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Food Network’s “Good Eats”
HD Editorial for “Assignment Earth”

“I reject your reality and substitute my own!” – Adam Savage, Mythbusters

[Rennie Klymyk]

To elaborate: Televisions are made of an array of phousphors suspended in the front of the screen in rows. At the back of the tv tube are guns that shoot electric impulses at the phousphors beginning at the top row in the left corner and moving to the right side, then jumping down to the 3rd row of phosphors and energizing that line from left to right and onto the 5th row, 7th row, 9th, etc. till it gets to the bottom of the tube and the guns focus on the 2nd row, 4th row, 6th row and so on(even lines). The odd numbers are the 1st field and the even numbers are the 2nd field. It takes 1/60th of a second to scan each field and it take both fields to make a frame. Thus 1 frame is 1/30th of a second. (ntsc) and is made of all the odd numbered lines and all the even numbered lines. This is interlaced scanning. Progressive scanning starts at line one and then jumps to line 2, 3, 4, etc. so there are no fields, when the guns have gotten to the bottom of the screen a full frame is complete. The first video cameras used tubes that were built like a crt tube in reverse. We no longer use tube cameras as we use CCD arrays to capture the image instead and crt’s (cathode ray tubes) are being replaced by lcd array screens and plasma monitors but this is still the way a video signal is processed, in lines from top to bottom, left to right.

[Sulaman Hameed]

Thanx All of U give me good suggestions…..