Are there any HPX Scene Files for Green Screen?

M

mat_shushan

New member
Might anyone know of any scene files specifically for Green Screen shoots?

I have had poor results (noise) with both an HPX 300 and 370 with a well lit Matthews 20x20 chroma screen. Shooting in 1080p 24 Avc Intra 100. The shots look terrific on site via an sdi out to monitor, but when we get them into AE there's a bit of noise everywhere and even more on the green screen. I have had very good results with these cameras over the past two years with a select few scene files but haven't shot green screen but twice. I must have the camera setup way wrong and/or should be using a digital green instead of chroma green?

Thanks for any suggestions!

Understanding that I need to bring down the detail levels, what else needs to be done?:

SCENE NAME :DIG30
00005000: 1 ; VFR : OFF
00005001: 30 ; FRAME RATE: 30 FRAME
00005002: 01AB0708 ; (SYNCHRO SCAN):
00005003: 12 ; DETAIL LEVEL: 4
00005004: 8 ; V DETAIL LEVEL: 0
00005005: 13 ; DETAIL CORING : 5
00005006: 7 ; CHROMA LEVEL: -1
00005007: 10 ; CHROMA PHASE: 2
00005008: 9 ; COLOR TEMP Ach: 1
00005009: 8 ; COLOR TEMP Bch: 0
0000500A: 113 ; MASTER PED: -15
0000500B: 16 ; A.IRIS LEVEL: 0
0000500C: 2 ; DRS EFFECT: 3
0000500D: 1 ; GAMMA : LOW
0000500E: 2 ; KNEE: LOW
0000500F: 2 ; MATRIX: FLUO
00005010: 1 ; SKIN TONE DTL : OFF
00005011: 0 ; V DETAIL FREQ : THIN
 
Last edited:
mat_shushan said:
Might anyone know of any scene files specifically for Green Screen shoots?

I have had poor results (noise) with both an HPX 300 and 370 with a well lit Matthews 20x20 chroma screen. Shooting in 1080p 24 Avc Intra 100. The shots look terrific on site via an sdi out to monitor, but when we get them into AE there's a bit of noise everywhere and even more on the green screen. I have had very good results with these cameras over the past two years with a select few scene files but haven't shot green screen but twice. I must have the camera setup way wrong and/or should be using a digital green instead of chroma green?

Thanks for any suggestions!
Click to expand...
If the green screen is well-lit, it shouldn't be showing noise, you only start to get noise below 20ire and usually on areas of flat gray


Understanding that I need to bring down the detail levels, what else needs to be done?:
Click to expand...
I personally use something like so:

00005003: 3 ; DETAIL LEVEL: -5
00005004: 11 ; V DETAIL LEVEL: 3
00005005: 13 ; DETAIL CORING : 5
00005006: 8 ; CHROMA LEVEL: 0
00005007: 8 ; CHROMA PHASE: 0
00005008: 8 ; COLOR TEMP Ach: 0
00005009: 8 ; COLOR TEMP Bch: 0
0000500A: 126 ; MASTER PED: -2
0000500B: 20 ; A.IRIS LEVEL: 4
0000500C: 0 ; DRS EFFECT: 1
0000500D: 5 ; GAMMA : CINELIKE D
0000500E: 2 ; KNEE: LOW
0000500F: 3 ; MATRIX: CINE-LIKE
00005010: 1 ; SKIN TONE DTL : OFF
00005011: 0 ; V DETAIL FREQ : THIN

You should set the knee to HIGH if you see it affecting the green screen. Normally you don't need to set the knee low indoors and especially in a studio environment as it can have a weird effect on certain highlights, like those on skin.

Using Y-get, make sure that your subject doesn't go below 35ire or you'll get noise, especially if the subject is back-lit, you should really avoid backlighting subjects on the 3xx cameras.
 
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