GS400 turns Purple to Blue at DVinfo.net

Jesse Bekas · September 8th, 2004, 12:09 PM

I stumbled across a thread on Camcorderinfo.com, where a user claimed that most of the violet and magenta objects he shot were coming up much more blue than they should have. He said he manually white balanced, and tried all the presets, but could not overcome this, and another member seconded his comments.

Have any of you experienced the same? Is there a strong blue shift on this camera overall, or just a problem with purples?

Frank Granovski · September 8th, 2004, 04:03 PM

Most miniDV cams have a problem with purples, whether it's a 1-chip or 3-chip camera. Some XL1 footage I have, all the purples came out either blue or pink. Still looked good, though.

John Gaspain · September 8th, 2004, 05:00 PM

I think it has to do with secondary colors. Secondary colors are orange, green and violet. These colors are made from the mixture of two primary colors. Their hues are midway between the two primary colors used to mix them. The primary colors are red, blue and yellow, which makes me curious why RGB is the industry standard? If the camera was RBY it could blend the colors better.

Anybody know why we use RGB as the standard?

Tony Playfair · September 8th, 2004, 07:27 PM

I have the same problem with my TRV900. Made the Disneyland castle look not too great, like blue again instead of purple!

Allan Rejoso · September 8th, 2004, 07:34 PM

Same thing with the Optura 100. I shot my daughter wearing purple kimono that came out blue...still looked great though.

Al Anthony Castillo · September 8th, 2004, 09:52 PM

I also bought a sony pc 109 but I returned it to the dealer when I found that same problem. How about the GS400? Same problem too?

Carlos E. Martinez · September 9th, 2004, 06:42 AM

I maybe off target, but this might also be an NTSC problem.

A friend of mine says that NTSC has a problem with red, as compared to PAL.

Can any PAL DV owner check on how his/her camera resolves purples?

Carlos

Andres Koppel · September 9th, 2004, 09:47 AM

I use the Pal GS400 and I haven't noticed that problem. But I believe that Pal cameras tend to give a red, magenta hue to everything -mine does- Reality is more yellow-greenish. There is a review of the GS400 at a Russian page that shows that colour deviation also. I have solved this problem with Vegas colour correction utility without any further fuss.

Eric Ortlieb · September 9th, 2004, 10:23 AM

I've seen $20,000 Sony broadcast cameras do the same thing. If any body lives in Southern Ca. (Newport Beach area) and wants to see this problem with their own eyes, stop in at Mariners Church for a Sat or Sun service. They use purple backgrounds extensively with 2 large screens...so any body can compare the real image to the electronic image.
VX-2000's do the very same thing. Mine do.
I heard from a friend (Bob Houser) that Ikegami cameras can record a true purple, that is why so many networks used them ...he also said the reason that Ikegami perfected them was to record the correct colors on the uniforms of the football teams who used purple in the design.

Kamal Tailor · September 17th, 2004, 09:09 AM

<<<-- Originally posted by John Gaspain : The primary colors are red, blue and yellow-->>>

red blue yellow?? they aren't the primary colours for light, the
primary colours for light are Red-Green-Blue

a true multi CCD single colour CCD should contain 7 CCDs, Red, Orange, Yellow, Green, Blue, Indigo, Violet.(this is not practicle though)

as these are the colours of the full spectrum light

you can pretty much make any colour of light from Red Green and Blue though so this is why they use them.

the CCD for blue probably doesn't pick up much below the blue spectrum so therefore doesn't capture purple as well as it should.

unless you live in some other physical dimension it should be the same for everyone

red blue yellow are the primary colours for pigments in paints etc

sorry if i sound agitate. i was assuming this was something that everyone should have in their general knowledge.

September 8th, 2004, 12:09 PM	#1
Jesse Bekas Major Player Join Date: Mar 2004 Location: Ridgefield Park, New Jersey, USA Posts: 572	GS400 turns Purple to Blue I stumbled across a thread on Camcorderinfo.com, where a user claimed that most of the violet and magenta objects he shot were coming up much more blue than they should have. He said he manually white balanced, and tried all the presets, but could not overcome this, and another member seconded his comments. Have any of you experienced the same? Is there a strong blue shift on this camera overall, or just a problem with purples?

September 8th, 2004, 05:00 PM	#3
John Gaspain Major Player Join Date: Oct 2003 Location: WA-USA Posts: 371	I think it has to do with secondary colors. Secondary colors are orange, green and violet. These colors are made from the mixture of two primary colors. Their hues are midway between the two primary colors used to mix them. The primary colors are red, blue and yellow, which makes me curious why RGB is the industry standard? If the camera was RBY it could blend the colors better. Anybody know why we use RGB as the standard? __________________ The glory of the World passes by.

September 9th, 2004, 09:47 AM	#8
Andres Koppel New Boot Join Date: Aug 2004 Location: Madrid Posts: 6	I use the Pal GS400 and I haven't noticed that problem. But I believe that Pal cameras tend to give a red, magenta hue to everything -mine does- Reality is more yellow-greenish. There is a review of the GS400 at a Russian page that shows that colour deviation also. I have solved this problem with Vegas colour correction utility without any further fuss. __________________ Andrés Koppel Tomás Inventa Prod. S.L. Tenerife - Madrid

September 9th, 2004, 10:23 AM	#9
Eric Ortlieb "The Cobra" Join Date: Sep 2004 Location: Aliso Viejo, California Posts: 10	I've seen $20,000 Sony broadcast cameras do the same thing. If any body lives in Southern Ca. (Newport Beach area) and wants to see this problem with their own eyes, stop in at Mariners Church for a Sat or Sun service. They use purple backgrounds extensively with 2 large screens...so any body can compare the real image to the electronic image. VX-2000's do the very same thing. Mine do. I heard from a friend (Bob Houser) that Ikegami cameras can record a true purple, that is why so many networks used them ...he also said the reason that Ikegami perfected them was to record the correct colors on the uniforms of the football teams who used purple in the design. __________________ www.classicvideoproducts.com every choice has it's tradeoffs Reality is for people who don't do video "Film Look Style"

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September 8th, 2004, 04:03 PM	#2
Frank Granovski Outer Circle Join Date: May 2002 Location: Hope, BC Posts: 7,524	Most miniDV cams have a problem with purples, whether it's a 1-chip or 3-chip camera. Some XL1 footage I have, all the purples came out either blue or pink. Still looked good, though.

September 8th, 2004, 07:27 PM	#4
Tony Playfair New Boot Join Date: Apr 2003 Posts: 7	I have the same problem with my TRV900. Made the Disneyland castle look not too great, like blue again instead of purple!

September 8th, 2004, 07:34 PM	#5
Allan Rejoso Major Player Join Date: Oct 2002 Location: Tokyo, Japan Posts: 569	Same thing with the Optura 100. I shot my daughter wearing purple kimono that came out blue...still looked great though.

September 8th, 2004, 09:52 PM	#6
Al Anthony Castillo New Boot Join Date: Jul 2004 Location: manila, philippines Posts: 6	I also bought a sony pc 109 but I returned it to the dealer when I found that same problem. How about the GS400? Same problem too?

September 9th, 2004, 06:42 AM	#7
Carlos E. Martinez Trustee Join Date: Oct 2003 Location: Rio de Janeiro, Brasil Posts: 1,138	I maybe off target, but this might also be an NTSC problem. A friend of mine says that NTSC has a problem with red, as compared to PAL. Can any PAL DV owner check on how his/her camera resolves purples? Carlos

September 17th, 2004, 09:09 AM	#10
Kamal Tailor Regular Crew Join Date: Apr 2004 Location: Australia, Victoria, Melbourne Posts: 65	<<<-- Originally posted by John Gaspain : The primary colors are red, blue and yellow-->>> red blue yellow?? they aren't the primary colours for light, the primary colours for light are Red-Green-Blue a true multi CCD single colour CCD should contain 7 CCDs, Red, Orange, Yellow, Green, Blue, Indigo, Violet.(this is not practicle though) as these are the colours of the full spectrum light you can pretty much make any colour of light from Red Green and Blue though so this is why they use them. the CCD for blue probably doesn't pick up much below the blue spectrum so therefore doesn't capture purple as well as it should. unless you live in some other physical dimension it should be the same for everyone red blue yellow are the primary colours for pigments in paints etc sorry if i sound agitate. i was assuming this was something that everyone should have in their general knowledge.