Author Topic: Isolation Question? (Read 3048 times)

pixel8 · « **on:** July 30, 2014, 18:45 »

I am working on a photo with a lot of fibers and I want to isolate it on a white background at pure white. Typically when I do isolations I will take the photo into photoshop and use the pen tool to select the object and then put in a 100% white background. With a bunch of fibers, using the selection tool is not going to work out.

How can I get a 100% white background in this situation? Do I blow out the backdrop with a strobe? Or is there a method in photoshop I can do?

Thanks

disorderly · « **Reply #1 on:** July 30, 2014, 18:58 »

It's a lot easier to blow out the background than it is to fix it in Photoshop. There are PS plugins that can help; I've had good results with Topaz ReMask. But with fine detail like hair or fibers it's best to get it right in camera.

For studio shots I use four lights: two on the subject (key at F/8, fill at F/5.6) and two more to light the white background (F/11.5). Then I adjust levels in PS so the background goes to solid white. I've done it all in PS, but it's a lot of work even for relatively simple edges.

etudiante_rapide · « **Reply #2 on:** July 30, 2014, 19:13 »

Quote from: disorderly on July 30, 2014, 18:58

It's a lot easier to blow out the background than it is to fix it in Photoshop. There are PS plugins that can help; I've had good results with Topaz ReMask. But with fine detail like hair or fibers it's best to get it right in camera.

For studio shots I use four lights: two on the subject (key at F/8, fill at F/5.6) and two more to light the white background (F/11.5). Then I adjust levels in PS so the background goes to solid white. I've done it all in PS, but it's a lot of work even for relatively simple edges.

+1. it is actually less work doing it on camera first time, since the lighting ratio is so simple, when u use the same number on the f stop transposed into the distance. eg. 5.6 ft, 8 ft, 11 ft, 16 ft,.. light placements will get u the lighting ratio without all the complicated calculations. and it works too.

mojaric · « **Reply #3 on:** August 01, 2014, 03:26 »

Quote from: disorderly on July 30, 2014, 18:58

It's a lot easier to blow out the background than it is to fix it in Photoshop.

For studio shots I use four lights: two on the subject (key at F/8, fill at F/5.6) and two more to light the white background (F/11.5).

yep

if are small object you can add a light from beneath the subject with translucient base to avoid all shadows (if you don't want shadows, someone prefer some shadow)

old crow · « **Reply #4 on:** August 01, 2014, 15:10 »

What color fibers, what will happen to fibers in the blowout ? maybe if that doesn't work green screen, select - color replace tool and adjust edge parameters ?

Does PS color replace tool have many ill effects in microstock ?

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Author Topic: Isolation Question? (Read 3048 times)

pixel8

disorderly

etudiante_rapide

mojaric

old crow

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