Since when is purple blue?

Started Sep 14, 2011 | Discussions
eNo
eNo
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It may be more complicated than that
In reply to Duncan C, Sep 16, 2011

Even with well calibrated WB, you may find that a color profile generated with a Colorchecker chart and DNG profile editor may be the only way forward. Then there's the monitor, the printer...
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Cytokine
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Re: Since when is purple blue?
In reply to Marker, Sep 16, 2011

With the sample you posted if you add a little Hue in Photoshop the purple returns without affecting the other colours too much.

John

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mstamper77
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Re: Since when is purple blue?
In reply to Marker, Sep 19, 2011

ur white balance is wrong. Also purples will go blue when underexposed.

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Marker
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Re: Since when is purple blue?
In reply to mstamper77, Sep 20, 2011

mstamper77 wrote:

ur white balance is wrong. Also purples will go blue when underexposed.

I'd agree except that the bag and bottle was shot with the built in flash and the camera was set to "flash" for white balance. It should be correct, no?
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cary smith
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Re: Since when is purple blue?
In reply to Marker, Sep 20, 2011

Marker wrote:

I'd agree except that the bag and bottle was shot with the built in flash and the camera was set to "flash" for white balance. It should be correct, no?

Not necessarily. What is the light spectral distribution of the flash?
http://en.wikipedia.org/wiki/Metamerism_%28color%29

cary

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Anada
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Re: Since when is purple blue?
In reply to cary smith, Sep 20, 2011

My experience with digital cameras is about 10 years. Purple has been the problem all the time! I've had 2 Canon p&s, 2 Fuji Bridge cameras and 2 Fuji p&s, 2 Panasonic p&s, 4 Nikon dSLR's and 4 different Nokia cameraphones.

The blue purple has been in each and every equipment except the Nokia N8. This I noticed during this summer and I checked it against D300 and TZ7.

Antti
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Marker
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Re: Since when is purple blue?
In reply to cary smith, Sep 20, 2011

cary smith wrote:

Marker wrote:

I'd agree except that the bag and bottle was shot with the built in flash and the camera was set to "flash" for white balance. It should be correct, no?

Not necessarily. What is the light spectral distribution of the flash?
http://en.wikipedia.org/wiki/Metamerism_%28color%29

cary

I'm sorry, you lost me on that one. I have no idea. I just figured that Nikon's own "flash" setting for white balance and the built in camera flash would be matched or compatible.

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olyflyer
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Re: Since when is purple blue?
In reply to Marker, Sep 20, 2011

Marker wrote:

cary smith wrote:

Marker wrote:

I'd agree except that the bag and bottle was shot with the built in flash and the camera was set to "flash" for white balance. It should be correct, no?

Not necessarily. What is the light spectral distribution of the flash?
http://en.wikipedia.org/wiki/Metamerism_%28color%29

cary

I'm sorry, you lost me on that one. I have no idea. I just figured that Nikon's own "flash" setting for white balance and the built in camera flash would be matched or compatible.

Actually, this is where you are wrong. Setting the camera WB to Flash will not automatically give you the right colours, especially the pop-up flash is too weak to overcome the affects of ambient light, add to that the fact that the pop-up is a direct flash, making it worse. Also...

Please don't tell us you had the camera flash in TTL-BL mode... It makes it even worse in that case.

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Tony Beach
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Re: Since when is purple blue?
In reply to Marker, Sep 20, 2011

Marker wrote:

cary smith wrote:

What is the light spectral distribution of the flash?
http://en.wikipedia.org/wiki/Metamerism_%28color%29

I'm sorry, you lost me on that one. I have no idea. I just figured that Nikon's own "flash" setting for white balance and the built in camera flash would be matched or compatible.

The flash emits light, but it is not full spectrum light and it is not the same as the light you were seeing when your eyes saw the purple. In fact, I gel my flashes with a warming filter to balance the light they emit so that my camera's sensors aren't overly deprived of red light and the light coming from the flash is closer to the light we get from the sun. Also, as flashes start to age the spectral properties of the light they emit changes, and different flash units will require different WB adjustments, so we are back to careful measurement of the WB using a calibrated reference (such as a gray card).

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Dash29
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Re: Samples
In reply to malch, Sep 20, 2011

If you set the WB with the spray top it matches the products very closely

Neither of these look like the actual product colour

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