Help-Cleaning up a White studio Background

[ilegales]

Hi

i would like some advise on how to clean up this studio shot taken on a white background

its cropped to show where the white falls into light grey -

i am looking for a quick easy way to fix this -

in the past i recall using the channels with a blue copy - levels to make the whites whiter and blacks darker

then some sort of selection then bring it into the layers palatte -

but i cant recall how or if i did it that way

PLEASE help with your advise on how to make a nice clean white background with keeping a little bit of shadows from their feet..

many thanks

[P_fuzz]

it looks the back was too over exposed at time of shoot!

maybe you could mask the floor and bring the exposure up? using curves or levels...
you have enough contrast in that to make a mask using channels!.

[Verywierd]

Since the background is plain white, just use "replace colour", sample the grey floor (not the shadows) and then shift the saturation and lightness sliders until you get white, and the fuzziness to determine how much shadow you want to retain. So long as you do it on a duplicate layer, you can easily mask out any unwanted effects on the subjects.

[ilegales]

fuzz - the background is not over - it should be clean white as the octa was very high up it made the white paper on the floor light grey

MANY thanks Very Wierd - thats the business !! replace colour worked a treat !!

cheers - learning something new every day :-)