eliminating a yellow cast on photos of white porcelain

Archived from groups: rec.photo.digital (More info?)

joannaperl@yahoo.com wrote:

> Hi,
> For my work, I must take product shots of a variety of different
> objects. When I take shots of white porcelain I seem to always get a
> yellow cast on one side that I haven't been able to get rid of using
> curves or levels in Photoshop. My office has halogen ceiling lighting
> and I am using a simple digital camera (Minolta DiMage X2). Can anyone
> recommend a way to take or work with the images that would help this
> and that wouldn't be too difficult for an amateur set-up?


Use a grey card or just use the eyedropper in the curves or levels tools
on the white porcelain.

Archived from groups: rec.photo.digital (More info?)

<joannaperl@yahoo.com> wrote in message
news:1113922667.172970.47100@g14g2000cwa.googlegroups.com...
> Hi,
> For my work, I must take product shots of a variety of different
> objects. When I take shots of white porcelain I seem to always get a
> yellow cast on one side that I haven't been able to get rid of using
> curves or levels in Photoshop. My office has halogen ceiling lighting
> and I am using a simple digital camera (Minolta DiMage X2). Can anyone
> recommend a way to take or work with the images that would help this
> and that wouldn't be too difficult for an amateur set-up?
>

It sounds like your problem is that you are using two different color light
sources. No gray card or white balance setting on your camera will correct
this and it will be very difficult, if even possible, to correct this with
PS. The simple solution is to use only one light source or only similarly
colored light sources. Either turn off the lights in your office or turn off
the flash on your camera. Even if you are not using flash, diffuse daylight
coming from a window is a different color than the halogen lights and will
cause the effect that you describe. Conveniently though, your flash will
likely have a similar color to the window light though not perfectly
identical.

Play with white posterboard as a reflector (opposite the window), turn off
the office lights, open the shades, place your subject close to the window
and use your flash with different amounts of flash compensation to get the
lighting that you desire. Try shooting with the same setup without flash
also.

Eric Miller

Archived from groups: rec.photo.digital (More info?)

joannaperl@yahoo.com wrote:
> Hi,
> For my work, I must take product shots of a variety of different
> objects. When I take shots of white porcelain I seem to always get a
> yellow cast on one side that I haven't been able to get rid of using
> curves or levels in Photoshop. My office has halogen ceiling lighting
> and I am using a simple digital camera (Minolta DiMage X2). Can
> anyone recommend a way to take or work with the images that would
> help this and that wouldn't be too difficult for an amateur set-up?

Try turning off the auto white balance on the camera and set it manually
to the color of the lights used. Sorry I don't know how your camera does
this.

--
Joseph Meehan

Dia's Muire duit

Archived from groups: rec.photo.digital (More info?)

joannaperl@yahoo.com wrote:
> Hi,
> For my work, I must take product shots of a variety of different
> objects. When I take shots of white porcelain I seem to always get a
> yellow cast on one side that I haven't been able to get rid of using
> curves or levels in Photoshop. My office has halogen ceiling lighting
> and I am using a simple digital camera (Minolta DiMage X2). Can anyone
> recommend a way to take or work with the images that would help this
> and that wouldn't be too difficult for an amateur set-up?

I'm not familiar with the capabilities of your camera but what might be
causing the problem is the camera is capturing an image that shows two
different light sources. The ceiling lights will give a differing
coloration on the porcelain than the flash. An easy way to tell is to
take a picture without the flash enabled or turn off the lights and take
a photograph. If the cast disappears then you need to light the subject
with only one type of lighting source. If the cast is still there then
I don't know what to suggest but I'm sure someone here can help you further.

Archived from groups: rec.photo.digital (More info?)

<joannaperl@yahoo.com> wrote in message
news:1113922667.172970.47100@g14g2000cwa.googlegroups.com...
> Hi,
> For my work, I must take product shots of a variety of different
> objects. When I take shots of white porcelain I seem to always get a
> yellow cast on one side that I haven't been able to get rid of using
> curves or levels in Photoshop. My office has halogen ceiling lighting
> and I am using a simple digital camera (Minolta DiMage X2). Can anyone
> recommend a way to take or work with the images that would help this
> and that wouldn't be too difficult for an amateur set-up?
>
Mixed Lighting sources, is the problem. If you are using Flash or Daylight
in additon to your roof Lights.

If your halogen roof lights are the miniature type with built in reflectors,
you can buy replacement bulbs which are colour corrected to daylight, that
is 6500K. Your Flash and Daylight will both be very close to 6500K, and the
problem of uneven colour will go away. If you then get an overall bluish
colour, change the White Balance in the Camera to 6500K.

Roy G

Archived from groups: rec.photo.digital (More info?)

Hello,

You can try software for color correction. Here are some
examples of white balance correction in Color Pilot:
http://www.colorpilot.com/cp_ex07.html
http://www.colorpilot.com/cp_ex11.html

Color Pilot allows you to save the results of the preceding correction.
If you have many photos with a similar color balance, it is enough to
correct one photo and then to click the Repeat button on the main
toolbar.
After downloading the program you can see the demonstration how to
correct several photos. For that you should open Example 14 on the menu
Examples.

Best regards,

Olga Panchenko
Two Pilots
http://www.colorpilot.com

Archived from groups: rec.photo.digital (More info?)

Thanks to everyone for their responses and the suggestions. They are
all very helpful and I look forward to trying them out.