Toronto Photography Meetup Group

Hello,
I have a model shot in white background,
I increased the exposure a bit to make the image look little more brighter as well make the white look overexpose so it makes it white white..............

so yea it look very white in Lightroom ..when i export it to 100% quality and jpg...the output image looks slightly dirty white...not exactly what i see in LR.
Any idea why this happens...or its because of the jpg conversion and i have to live with it....
thanks in advance for the help
Yeshwanth

post the pic might be a colorspace issue.

Coz when i output the, adjusted raw image from LR it look grey ..the same looks white in LR.....

I'm going to take a guess and say it's your perception since in LR your background is mostly likely some shade of grey and after you export to jpeg you are probably viewing the image on a lighter background which makes your eyes believe the whites are not as bright. Here is what I would do to verify - download a color picker program and hover over the same exact spot of "white" both in lightroom and after exported to jpeg. If the color picker shows that the white area has the same values in both then it is due to your perception. If the values are different then you may be having color space issues.

Here a link to a color picker program you can use. http://www.iconico.com/download.aspx?ap ... &type=free

I think the BG was underexposed as opposed to +2 stops instead. The shadows are behind the subjects.

Can't really help you with LR since I'm a dinosaur. I don't have LR .

Try brushing in +2 stops overexposure in RAW on 80 % of the BG and then you can just refine it later with a quick selection.

Before you go into all the before and after comparisons you could just use the the numbers under the lightroom histogram just run the magnification tool tip over the background and if it doesn't show up as 100% 100% 100% it isn't pure white. I doubt if it is as then the bright white shirt would be terribly overexposed.

Normally because of the white shirt you would have to move the models away from the back drop and illuminate the backdrop with an additional light. Or as been suggested above apply a mask in post.

BTW the surrounding screen intensity can be adjusted in lightroom (I forget the quick keys).

to save time on post processing I just make sure that camera shows blown highlights and double check on camera LCD when shooting white BG. since lightroom's user interface is dark, things tend to look more white than they actually are.

from what I tested you need at least 3-4 feet distance(but more the better) between subject and BG if you want white white BG while not having the subject glow. and of course, separate lights to light the BG only. can't do it with a single light setup unless you're willing to manually erase the BG to white.

Thank you for the replies James,Randy,Ryan and Sebastin

@James
Yes you are right .. The bg is 92-97% of grey....

@Randy
Thanks i did brush and masked it...but i guess i got to make sure its +2 and not +1.8

@ Ryan
It was 96 96 96 when i changed it to 100 100 100 my problem was solved

@Sebastin
I think the camera showed blown highlight but not the whole BG so i didnt bother to set it up since i had the post option to fix it ...but next time i will make sure its screaming highlight information if i am shooting

Plus yes 3-4 feet

Thank you everybody ....
Cheers
Yeshwanth

I encountered this in the past. My experience is that it was monitor calibration. I can't find the thread here though.

For seamless white background, watch this video.

http://www.zarias.com/white-seamless-qu ... t-1-video/

I love that guy's site, so helpful.

Oh man, thanks for that! I think I can learn awhole buncha new stuff from this guy

lol when he said "If you're on a PC, just press ctrl+alt+del and it will solve alll your PC problems"

I definitely learn something here. I wasted so much time deleting dirt from white seamless bg's.
I appreciate the link

Thank you so much ...that link surely helped me.....

You can also hit the J key in LR and your highlights and shadows should turn red and dark blue or you could acheive the same affect by hovering over the arrows in the histogram.

Metrix, that is a cool tip RE: floating over the image to reveal the RGB values below, nice!